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`JPH10172608A SHEET-LIKE LITHIUM SECONDARY BATTERY
`
`Applicants: MITSUBISHI CABLE IND LTD
`
`Inventors: IJIRI YASUO,ZUSHI TOSHIHIRO
`
`Classifications:
`IPC
`
`H01M10/05; H01M10/0525; H01M10/0566; H01M4/02; H01M4/36; (IPC1-7): H01M10/40; H01M4/02;
`
`H01M4/58;
`
`CPC
`
`Y02E60/10 (EP);
`
`Priorities: JP32548896A 1996-12-05
`
`Application: JP32548896A·1996-12-05
`
`Publication: JPH10172608A·1998-06-26
`
`Published as: JPH10172608A
`
`SHEET-LIKE LITHIUM SECONDARY BATTERY
`
`Abstract
`
`PROBLEM TO BE SOLVED: To reduce the weight and thickness of a battery by the quantity corresponding to the reduced
`
`quantity of a negative electrode active substance layer by setting the effective capacity of the negative electrode active
`substance layer consisting of graphite of a negative electrode sheet to be in the prescribed range smaller than the conventional
`
`relative to the effective capacity of a positive electrode active substance layer of a positive electrode sheet. SOLUTION: A
`
`negative electrode sheet 1 having a negative electrode active substance layer 11 and a positive electrode sheet 2 having a
`positive electrode active substance layer 22 are laminated through a separator 3 in which the nonaqueous liquid electrolyte is
`
`filled, and sealed in a housing body 4 to constitute a battery. When the effective capacity of the negative electrode active
`substance layer 11 is excessive relative to that of the positive electrode active substance layer 22, the weight and thickness of
`
`the battery is increased. While the it is excessively small, possibility of generation of dendrite is increased. Thus, the effective
`capacity of the negative electrode active substance layer 11 is 80-120, more preferably, 100-110 relative to the effective capacity
`
`of the positive electrode active substance layer 11. The battery more excellent in space factor, weight and safety than
`
`conventional ones can be provided.
`
`https://worldwide.espacenet.com/patent/search/family/018177444/publication/JPH10172608A?q=pn%3DJPH10172608A
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`Notice
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`complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
`financial decisions, should not be based on machine-translation output.
`
`CLAIMS JPH10172608A
`
`1.
`13 A negative electrode sheet having a negative electrode active material layer made of graphite
`and a positive electrode sheet are laminated with an electrolyte layer interposed therebetween.
`A sheet-shaped lithium secondary battery having a capacity of 80-120.
`17 黒鉛からなる負極活物質層を有する負極シートと正極シートとがその間に電解質の層を介在し
`た状態にて積層されており、且つ正極活物質層の実効容量１００に対して負極活物質層の実効
`容量は８０〜１２０であることを特徴とするシート状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`2.
`25 The sheet-like lithium secondary battery according to claim 1, wherein the effective capacity of
`the negative electrode active material layer is 100-110 with respect to the effective capacity of
`100 of the positive electrode active material layer.
`29 正極活物質層の実効容量１００に対して負極活物質層の実効容量は１００〜１１０である請求
`項１記載のシート状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`3.
`36 The sheet-like lithium secondary battery according to claim 1, wherein the electrolyte is a non-
`aqueous liquid electrolyte.
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`39 電解質が非水系の液体電解質である請求項１または２記載のシート状リチウム二次電池。
`
`4.
`45 The sheet-like lithium secondary battery according to any one of claims 1 to 3, wherein the
`positive electrode active material layer comprises a lithium-containing transition metal oxide.
`48 正極活物質層がリチウム含有遷移金属酸化物からなる請求項１〜３のいずれかに記載のシート
`状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
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`Patent Translate
`
`Powered by EPO and Google
`
`Notice
`
`This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
`complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
`financial decisions, should not be based on machine-translation output.
`
`DESCRIPTION JPH10172608A
`
`[0001]
`13 TECHNICAL FIELD The present invention relates to a lithium secondary battery, and more
`particularly to a sheet-like lithium secondary battery.
`16 【発明の属する技術分野】本発明は、リチウム二次電池に関し、特にシート状のリチウム二次
`電池に関する。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0002]
`23 2. Description of the Related Art Lithium secondary batteries having a large discharge capacity
`are attracting attention as batteries for electronic devices such as portable telephones and
`personal computers.
`27 【従来の技術】携帯型の電話やパソコンなどの電子機器用の電池として放電容量の大きいリチ
`ウム二次電池が脚光を浴びている。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`31 Conventionally, three-dimensional batteries, such as columnar and box-shaped batteries, have
`mainly been used as lithium secondary batteries. Recently, however, interest in sheet-shaped
`lithium secondary batteries has increased because of their small discharge capacity compared
`to three-dimensional batteries, but their space factor and light weight. A sheet-like lithium
`secondary battery basically has a structure in which positive and negative electrode sheets are
`sealed with an appropriate exterior sheet without being wound with an electrolyte interposed
`therebetween. As for the electrolyte, solid and liquid electrolytes have been proposed, as in the
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`case of the three-dimensional battery. The liquid electrolyte is used in a state in which the
`separator is impregnated with it, as in the case of the three-dimensional battery.
`41 このリチウム二次電池として、従来は主として円柱状や箱型など、立体型電池が主流をなして
`きた。 しかし近時、立体型電池と比較して放電容量が小さいがスペースファクター並びに軽量
`の点から、シート状のリチウム二次電池にも関心が高まっている。 シート状リチウム二次電池
`は、基本的には、正負両極シートの間に電解質を介在させた状態にて巻回されることなく適当
`な外装シートにて封止した構造を有する。 電解質については、立体型電池と同様に、固体のも
`のと液体のものとが提案されている。 液体電解質は、立体型電池の場合と同様に、これをセパ
`レータに含浸した状態で使用される。
`
`[0003]
`53 By the way, in recent years, the demand for further reduction in weight and thickness of sheet-
`like lithium secondary batteries has been increasing, but conventional products are practically
`unimproved in these respects.
`57 ところで、最近におけるシート状リチウム二次電池の一層の軽量化や薄化の要求は益々強くな
`っているにも拘らず、従来品はそれらの点において実際上未改良の状態にある。
`
`----------------------------------------------------------------------------------------------------------------------------
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`
`61 The reason for this will be explained below.
`63 以下、その理由について説明する。
`
`[0004]
`69 In a three-dimensional lithium secondary battery such as a cylindrical or box-shaped battery, a
`negative electrode sheet and a positive electrode sheet are housed in an outer container in a
`state in which an electrolyte layer is interposed therebetween and the sheet is rolled many
`times. there is
`74 円柱状や箱型などの立体型のリチウム二次電池においては、負極シートと正極シートとがその
`間に電解質層を介在して、且つ多数回ロール巻きされた状態にて外装容器内に収容されている
`。
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`79 Due to the multi-roll winding structure, the inside of the battery has poor heat dissipation.
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`Therefore, if an abnormal accident occurs inside the battery for some reason and an
`overcurrent flows, this causes local overheating, which in turn causes overheating. There is a
`danger that it will propagate cumulatively and cause the battery to catch fire. In particular, if
`the effective capacity of the negative electrode active material layer is too small with respect
`to the effective capacity of the positive electrode active material layer, the risk of explosion
`tends to increase. For example, in the Technical Report of the Institute of Electrical
`Communication, PE94-57, CPM94-100 (1995-01), which reported a battery ignition test by a
`nail penetration test, in a lithium secondary battery having a negative electrode active material
`layer made of graphite, It has been pointed out that it is necessary to set the effective capacity
`of the negative electrode active material layer to at least 170 with respect to that of the
`positive electrode active material layer of 100 in order to prevent dangers such as ignition.
`92 かかる多数回ロール巻きの構造の故に電池の内部は放熱性が悪く、このために電池内部で何等
`かの理由で異常事故が生じて過電流が流れると、それによる局部的な過熱が生じ、ついでそれ
`が累積伝播して電池が発火する危険がある。 特に、正極活物質層の実効容量に対して負極活物
`質層のそれが過少であると、爆発の危険が増大する傾向がある。 例えば、釘貫通実験による電
`池の発火試験を報じた電気通信学会技報、ＰＥ９４−５７、
`ＣＰＭ９４−１００（１９９５−０１）には、黒鉛からなる負極活物質層を有するリチウム二
`次電池においては、発火などの危険防止のために該負極活物質層の実効容量を正極活物質層の
`それ１００に対して少なくとも１７０とすることの必要性が指摘されている。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0005]
`105 The effective capacity ratio in such a three-dimensional lithium secondary battery has also
`been adopted in conventional sheet-like lithium secondary batteries.
`108 かかる立体型のリチウム二次電池における実効容量比が、従来のシート状リチウム二次電池に
`も採用されてきた。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`112 As will be described later, the effective capacity of the negative electrode active material layer
`is proportional to the amount of the negative electrode active material used to form the layer,
`so an increase in the negative electrode active material layer leads to increased weight and
`thickness of the negative electrode active material layer and thus the battery itself. ing.
`117 負極活物質層の実効容量は、後記する通り、該層を形成する負極活物質の使用量に比例するの
`で、その増大は負極活物質層の、ひいては電池自体の高重量、高厚さに繋がっている。
`
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`[0006]
`124 By the way, when the inventors of the present invention conducted nail penetration
`experiments and other local destruction experiments on sheet-like lithium secondary
`batteries having negative electrode active material layers made of graphite with various
`effective capacities, unexpectedly, the negative electrode active material layers However,
`even in the case of a considerably low effective capacity, no substantial temperature rise was
`observed not only in other parts of the battery, but also in local breakdown parts, and it was
`found to be extremely safe.
`132 ところで、本発明者らは実効容量が種々の黒鉛からなる負極活物質層を有するシート状リチウ
`ム二次電池について釘貫通実験やその他の局所破壊実験を行ったところ、予想外にも負極活
`物質層がかなり低実効容量の場合でも、電池の他所は勿論のこと局所破壊個所すら実質的な
`温度上昇は見られず頗る安全であることが判明した。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`138 The reason for this safety is that sheet-like lithium secondary batteries are generally thin and
`have excellent heat dissipation properties, so even if local overheating occurs inside the
`battery, it will cool down within a very short period of time.
`142 かく安全なる理由は、シート状リチウム二次電池が一般的に薄くて放熱性が極めて良好なため
`に、電池内部で局部的な過熱が生じても極く短時間内に冷却するからである。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0007]
`149 SUMMARY OF THE INVENTION The present invention has been completed based on the
`above-mentioned new findings, and an object of the present invention is to provide a seat
`that is safe and further improved in terms of space factor and light weight. It is an object of
`the present invention to provide a lithium secondary battery having a shape.
`154 【発明が解決しようとする課題】本発明は、上記の新知見に基づいて完成したものであって、
`本発明の課題は、安全であり、しかもスペースファクター並びに軽量の点において一層改善
`されたシート状のリチウム二次電池を提供することにある。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0008]
`162 The present invention has the following features.
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`164 【課題を解決するための手段】本発明は、つぎの特徴を有する。
`
`(1)
`170 A negative electrode sheet having a negative electrode active material layer made of graphite
`and a positive electrode sheet are laminated with an electrolyte layer interposed
`therebetween. A sheet-shaped lithium secondary battery having a capacity of 80-120.
`174 黒鉛からなる負極活物質層を有する負極シートと正極シートとがその間に電解質の層を介在し
`た状態にて積層されており、且つ正極活物質層の実効容量１００に対して負極活物質層の実
`効容量は８０〜１２０であることを特徴とするシート状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`(2)
`182 The sheet-like lithium secondary battery according to (1) above, wherein the effective
`capacity of the negative electrode active material layer is 100 to 110 with respect to the
`effective capacity of 100 of the positive electrode active material layer.
`186 正極活物質層の実効容量１００に対して負極活物質層の実効容量は１００〜１１０である上記
`(1) 記載のシート状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`(3)
`193 The sheet-like lithium secondary battery according to (1) or (2) above, wherein the electrolyte
`is a non-aqueous liquid electrolyte.
`196 電解質が非水系の液体電解質である上記(1) または(2) 記載のシート状リチウム二次電池。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`(4)
`202 The sheet-like lithium secondary battery according to any one of the above (1) to (3), wherein
`the positive electrode active material layer comprises a lithium-containing transition metal
`oxide.
`
`----------------------------------------------------------------------------------------------------------------------------
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`206 正極活物質層がリチウム含有遷移金属酸化物からなる上記(1) 〜(3) のいずれかに記載のシート
`状リチウム二次電池。
`
`[0009]
`213 [Function] It is not necessary to increase the effective capacity of the negative electrode active
`material layer with respect to the effective capacity of the positive electrode active material
`layer as in the conventional case.
`217 【作用】正極活物質層の実効容量に対して負極活物質層のそれを従来のように大きくする必要
`がなく、例えば正極活物質層と等量とすることも可能である。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`221 Therefore, the weight and thickness of the sheet-like lithium secondary battery can be
`reduced by the amount that can reduce the amount of the negative electrode active material
`layer.
`225 よって負極活物質層の量を少なくし得る分量だけシート状リチウム二次電池の重量や厚みを小
`さくすることができる。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0010]
`232 BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the positive
`electrode active material, positive and negative current collectors, solid and liquid
`electrolytes, and separators required when liquid electrolytes are used are all lithium
`secondary batteries or lithium ion batteries. It may be one conventionally known in the field
`of secondary batteries.
`238 【発明の実施の形態】本発明において、正極活物質、正負の各集電体、固体や液体の電解質、
`および液体電解質を用いる場合に必要なセパレータなどは、いずれもリチウム二次電池ある
`いはリチウムイオン二次電池の分野で従来から知られているものであってよい。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0011]
`246 Only graphite is used as the negative electrode active material, and this may be
`conventionally known in the field of lithium secondary batteries or lithium ion secondary
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`batteries.
`250 負極活物質のみ黒鉛からなるものが採用されるが、これとてリチウム二次電池あるいはリチウ
`ムイオン二次電池の分野で従来から知られているものであってよい。
`
`254 Preferable examples of graphite include various natural graphites and artificial graphites such
`as fibrous graphite, flake graphite, and spherical graphite. They include polyethylene,
`ethylene-propylene-diene based polymers, and the like.
`258 黒鉛の好ましい例を挙げると、各種の天然黒鉛や人造黒鉛、例えば繊維状黒鉛、鱗片状黒鉛、
`球状黒鉛などの黒鉛類であり、結着剤としては、ポリテトラフルオロエチレン、ポリビニリ
`デンフルオリド、ポリエチレン、エチレン−プロピレン−ジエン系ポリマーなどである。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`263 The amount of the negative electrode active material used is about 80 to 96 parts by weight
`per 100 parts by weight of the total amount of the negative electrode active material and the
`binder.
`267 負極活物質の使用量は、負極活物質と結着剤との合計量１００重量部あたり８０〜９６重量部
`程度である。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0012]
`274 Preferred examples of the positive electrode active material include those having a potential
`difference of at least 1 V with respect to the negative electrode, such as V2 O5, MnO2,
`LiMn2 O4, LiCoO2, LiNi0.5 Co0.5 O2, LiNiO2, and Li--Co--P system composite oxides.
`substances (LiCo0.5P0.5O2, LiCo0.4P0.6O2, LiCo0.6P0.4O2, LiCo0.3Ni0.3P0.4O2,
`LiCo0.2Ni0.2P0.6O2, etc.), Lithium-containing transition metal oxides such as TiS2, MoS2
`and MoO3.
`281 正極活物質として好ましい例を挙げると、負極との電位差が少なくとも１Ｖであるもの、例え
`ばＶ2 Ｏ5 、ＭｎＯ2 、ＬｉＭｎ2 Ｏ4 、ＬｉＣｏＯ2 、ＬｉＮｉ0.5 Ｃｏ0.5 Ｏ2 、
`ＬｉＮｉＯ2 、Ｌｉ−Ｃｏ−Ｐ系複合酸化物（ＬｉＣｏ0.5 Ｐ0.5 Ｏ2 、ＬｉＣｏ0.4 Ｐ0.6
`Ｏ2 、ＬｉＣｏ0.6 Ｐ0.4 Ｏ2 、ＬｉＣｏ0.3 Ｎｉ0.3 Ｐ0.4 Ｏ2 、ＬｉＣｏ0.2 Ｎｉ0.2 Ｐ0.6
`Ｏ2 など）、ＴｉＳ2 、ＭｏＳ2 、ＭｏＯ3 などのリチウム含有遷移金属酸化物である。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`288 Among these, Li̶Co̶P-based composite oxides are particularly preferable because they can
`particularly increase the electromotive force and charge/discharge voltage of the secondary
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`battery.
`292 これらのうちでも、二次電池の起電力や充放電電圧を特に高くすることができる
`Ｌｉ−Ｃｏ−Ｐ系複合酸化物が特に好ましい。
`
`296 Examples of binders include polytetrafluoroethylene, polyvinylidene fluoride, polyethylene,
`and ethylene-propylene-diene-based polymers.
`299 結着剤としては、ポリテトラフルオロエチレン、ポリビニリデンフルオリド、ポリエチレン、
`エチレン−プロピレン−ジエン系ポリマーなどである。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`303 As the conductive agent, various types of conductive graphite, conductive carbon black, and
`the like may be used. The amount of the positive electrode active material used is about 80
`to 95 parts by weight per 100 parts by weight of the total amount of the positive electrode
`active material, the binder, and the conductive agent, and the amount of the binder used is 1
`part per 100 parts by weight of the positive electrode active material. 10 parts by weight,
`and the amount of the conductive agent used is about 3 to 15 parts by weight per 100 parts
`by weight of the positive electrode active material.
`311 導電剤としては、各種の導電性黒鉛や導電性カーボンブラックなどでよい。 正極活物質の使
`用量は、正極活物質、結着剤、および導電剤の合計量１００重量部あたり８０〜９５重量部
`程度であり、結着剤の使用量は正極活物質１００重量部あたり１〜１０重量部程度であり、
`また導電剤の使用量は正極活物質１００重量部あたり３〜１５重量部程度である。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0013]
`320 As the negative electrode current collector, a foil or perforated foil having a thickness of
`about 5 to 100 μm, particularly about 8 to 50 μm, made of a conductive metal such as
`copper, nickel, silver, or SUS, or a foil or a perforated foil having a thickness of about 20 to
`300 μm, particularly 25 to 50 μm, is used. Expanded metal having a thickness of about
`100 μm is preferable.
`326 負極集電体としては、銅、ニッケル、銀、ＳＵＳなどの導電性金属の、厚さ５〜１００μｍ程
`度、特に８〜５０μｍ程度の箔や穴あき箔、厚さ２０〜３００μｍ程度、特に２５〜
`１００μｍ程度のエキスパンドメタルなどが好ましい。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`331 As the positive electrode current collector, a conductive metal such as aluminum, an
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`aluminum alloy, or titanium may be used. A degree of expanded metal or the like is
`preferred.
`335 正極集電体としては、アルミニウム、アルミニウム合金、チタンなどの導電性金属の、厚さ
`１０〜１００μｍ程度、特に１５〜５０μｍ程度の箔や穴あき箔、厚さ２５〜３００μｍ程
`度、特に３０〜１５０μｍ程度のエキスパンドメタルなどが好ましい。
`
`[0014]
`343 The negative electrode sheet is formed by applying a mixed composition of a negative
`electrode active material and a binder on one or both sides of a negative electrode current
`collector, drying the mixture sufficiently, and rolling it to a thickness of about 20 to 500 μm,
`particularly 50 to 200 μm. Examples include those having a negative electrode active
`material layer of about the same.
`349 負極シートは、負極集電体の片面または両面に負極活物質と結着剤との混合組成物を塗布し、
`充分に乾燥後、圧延して形成した厚さ２０〜５００μｍ程度、特に５０〜２００μｍ程度の
`負極活物質層を有するものが例示される。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`354 On the other hand, the positive electrode sheet is formed by coating a mixed composition of a
`positive electrode active material and a binder on one or both sides of a positive electrode
`current collector, drying the composition sufficiently, and rolling the positive electrode sheet
`to a thickness of 20 to 500 μm. Examples include those having a positive electrode active
`material layer with a thickness of about 50 to 200 μm, particularly about 50 to 200 μm.
`360 一方、正極シートは、正極集電体の片面または両面に正極活物質と結着剤との混合組成物を塗
`布し、充分に乾燥して形成、圧延して形成した厚さが、２０〜５００μｍ程度、特に５０〜
`２００μｍ程度の正極活物質層を有するものが例示される。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0015]
`368 Solid electrolytes include one or a mixture of two or more of organic polymers such as
`polyethylene oxide, modified polyethylene oxide, polyacrylonitrile, polyphosphazene, acrylic
`resin, polymethylsiloxane, polyvinyl compound, polyvinylidene fluoride, and various rubbers.
`Alternatively, a gel-like substance composed of one or a mixture of two or more of the
`organic polymers and a non-aqueous liquid electrolyte, which will be described later, is
`exemplified.
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`
`375 固体電解質としては、ポリエチレンオキサイド、変性ポリエチレンオキサイド、ポリアクリロ
`ニトリル、ポリフォスファゼン、アクリル樹脂、ポリメチルシロキサン、ポリビニル化合物
`、ポリビニリデンフルオリド、および各種ゴムなどの有機高分子の一種または二種以上の混
`合物、あるいは該有機高分子の一種または二種以上の混合物と後記する非水系の液体電解質
`とからなるゲル状物などが例示される。
`
`382 As the non-aqueous liquid electrolyte, an electrolytic solution obtained by dissolving a salt in
`an organic solvent can be used. Examples of the salts include LiClO4, LiBF4, LiPF6, LiAsF6,
`LiAlCl4, Li(CF3 SO2)2 N, and the like, and one or a mixture of two or more thereof is used.
`Organic solvents include ethylene carbonate, propylene carbonate, dimethyl carbonate,
`diethyl carbonate, ethylmethyl carbonate, dimethyl sulfoxide, sulfolane, γ-butyrolactone,
`1,2-dimethoxyethane, N,N-dimethylformamide, tetrahydrofuran, 1,3- Dioxolane, 2-
`methyltetrahydrofuran, diethyl ether and the like are exemplified, and one or a mixture of
`two or more thereof is used. The appropriate concentration of the salt in the electrolytic
`solution is about 0.1 to 3 mol/liter.
`392 非水系の液体電解質としては、塩類を有機溶媒に溶解させた電解液が使用できる。 該塩類と
`しては、ＬｉＣｌＯ4 、ＬｉＢＦ4 、ＬｉＰＦ6 、ＬｉＡｓＦ6 、ＬｉＡｌＣｌ4 、
`Ｌｉ（ＣＦ3 ＳＯ2 ）2 Ｎなどが例示され、それらの一種または二種以上の混合物が使用され
`る。 有機溶媒としては、エチレンカーボネート、プロピレンカーボネート、ジメチルカーボ
`ネート、ジエチルカーボネート、エチルメチルカーボネート、ジメチルスルホキシド、スル
`ホラン、γ−ブチロラクトン、１，２−ジメトキシエタン、Ｎ，Ｎ−ジメチルホルムアミド
`、テトラヒドロフラン、１，３−ジオキソラン、２−メチルテトラヒドロフラン、ジエチル
`エーテルなどが例示され、それらの一種または二種以上の混合物が使用される。 また電解液
`中における上記塩類の濃度は、０．１〜３モル／リットル程度が適当である。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0016]
`406 In the present invention, the effective capacity (mAh) of each positive and negative active
`material layer is given by the following formula (1).
`409 本発明において、正負の各活物質層の実効容量（ｍＡｈ）は、下式（１）にて与えられる。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`412 Effective capacity = C × W (1) where C is the unit capacity (mAh/g) per 1 g of active material
`present in each of the positive and negative active material layers, and W is the total capacity
`of the active material in the active material layer. Weight (g). Since the unit capacity and
`effective capacity of each positive and negative active material layer differ depending on the
`
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`
`active material of the counter electrode and the type of electrolyte used, in the present
`invention, the effective capacity is a value measured by the following method. [Measurement
`method of effective capacity] According to the three-electrode method described in Akira
`Fujishima et al., "Electrochemical measurement method (top), P6, Gihodo Publishing, 1991
`(Tokyo)", metallic lithium was used as a counter electrode and a reference electrode. Measure
`using When a solid electrolyte is used as the electrolyte, a sheet having a thickness equal to
`the interval between the positive and negative electrode sheets is hermetically interposed.
`The gap between the positive and negative electrode sheets is maintained in a state in which
`the liquid electrolyte is airtightly impregnated.
`426 実効容量＝Ｃ×Ｗ （１）ここに、Ｃは正負の各活物質層中に存在する活物質１ｇあたりの単
`位容量（ｍＡｈ／ｇ）であり、Ｗは活物質層中の合計活物質の重量（ｇ）である。 正負の各
`活物質層の単位容量や実効容量は、対抗電極の活物質並びに使用する電解質の種類によって
`異なるので、本発明においては実効容量は、下記の方法で測定された値とする。 〔実効容量
`の測定方法〕藤島 昭ら著の「電気化学測定法（上）、Ｐ６、技報堂出版、１９９１年（東京
`）」に記載の三電極方式に準拠し、対電極および参考電極として金属リチウムを用いて測定
`する。 電解質として固体電解質を使用する場合には、上記正負極シート間の間隔に等しい厚
`さのシートを気密に介在させ、一方、液体電解質を用いる場合には、任意の材料からなるセ
`パレータシート内に該液体電解質が気密に含浸された状態にて上記の正負極シート間の間隔
`を保持するようにする。
`
`[0017]
`441 If the effective capacity of the negative electrode active material layer is too large relative to
`the effective capacity of the positive electrode active material layer, the object of the present
`invention cannot be achieved.
`445 正極活物質層の実効容量に対する負極活物質層の実効容量が過大であると、本発明の課題が達
`成されず、一方、過少であるとデンドライトが発生する可能性が増大する。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`449 Therefore, the effective capacity of the negative electrode active material layer is set to 80 to
`120, preferably 100 to 110, with respect to 100 of the effective capacity of the positive
`electrode active material layer.
`453 したがって負極活物質層の実効容量は、正極活物質層の実効容量１００に対して８０〜
`１２０、好ましくは１００〜１１０とする。
`
`----------------------------------------------------------------------------------------------------------------------------
`
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`

`[0018]
`460 BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be
`described in more detail with reference to the drawings.
`463 【実施例】以下、本発明を図例を用いて一層詳細に説明する。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`466 FIG. 1 is a top view of an embodiment of the invention, and FIG. 2 is a cross-sectional view
`taken along line X--X in FIG. 1 and 2, 1 is a negative electrode sheet, 11 is a negative
`electrode current collector, 12 is a negative electrode active material layer, 2 is a positive
`electrode sheet, 21 is a positive electrode current collector, 22 is a positive electrode active
`material layer, and 3 is a negative electrode sheet 1. and the positive electrode sheet 2, 4 is
`an exterior body composed of two exterior sheets 42 and 43, 41 is a sealing portion of the
`exterior body 4, 5 is a negative electrode terminal, and 6 is a positive electrode terminal. The
`separator 3 and the exterior body 4 are airtightly filled with a non-aqueous liquid electrolyte.
`475 図１は本発明の実施例の上面図であり、図２は図１におけるＸ−Ｘ線に沿った断面図である。
`図１、図２において、１は負極シート、１１は負極集電体、１２は負極活物質層、２は正極
`シート、２１は正極集電体、２２は正極活物質層、３は負極シート１と正極シート２との間
`に介在されたセパレータ、４は２枚の外装シート４２、４３からなる外装体、４１は外装体
`４の封止部、５は負極ターミナル、６は正極ターミナルである。 セパレータ３および外装体
`４内には、非水系の液体電解質が気密に充填されている。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0019]
`486 The exterior sheets 42 and 43 are preferably those that are impermeable to gas and water,
`for example, composite sheets having a thermoplastic resin laminate layer such as polyester
`or polypropylene on both sides of a metal foil such as copper or aluminum. The contents can
`be heat-sealed using the plastic resin laminate layer.
`491 外装シート４２、４３としては、気体および水に対して非透過性のもの、例えば銅、アルミニ
`ウムなどの金属箔の両面にポリエステルやポリプロピレンなどの熱可塑性樹脂ラミネート層
`を有する複合シートが好ましく、該熱可塑性樹脂ラミネート層を利用して内容物を熱融着封
`止することができる。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0020]
`
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`

`500 The entire edge of the cathode active material layer 22 does not protrude beyond the edge of
`the anode active material layer 12, as shown, but in the embodiment of FIG. 22, the effective
`capacities of the positive and negative active material layers measured by the method
`described above are within the range described above.
`505 正極活物質層２２の全端縁は、図示する通り、負極活物質層１２の端縁より外に出ておらず、
`しかして図１の実施例においては負極活物質層１２は正極活物質層２２よりも広面積を有す
`るが、前記した方法で測定した正負の各活物質層の実効容量は前記した範囲内にある。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`510 In the present invention, it is not always necessary to prevent the entire edge of the positive
`electrode active material layer 22 from protruding beyond the edge of the negative electrode
`active material layer 12, but it is preferable from the viewpoint of preventing the generation
`of dendrites.
`515 なお本発明において、正極活物質層２２の全端縁が、負極活物質層１２の端縁より外に出ない
`ようにすることは必ずしも必要ではないが、デンドライト発生防止の点から好ましい。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`519 In that case, the difference between the edges of the positive and negative electrode active
`material layers is preferably at least about 0.5 mm, particularly about 0.5 to 5 mm. The
`distance between the negative electrode active material layer 12 and the positive electrode
`active material layer 22 is about the same as the distance in a normal three-dimensional
`lithium secondary battery, for example 10 to 100 μm.
`525 その場合、正負極活物質層の端縁間の差は、少なくとも０．５ｍｍ程度、特に０．５〜
`５ｍｍ程度とすることが好ましい。 負極活物質層１２と正極活物質層２２との間隔は、通常
`の立体状リチウム二次電池における間隔と同程度、例えば１０〜１００μｍである。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0021]
`533 The embodiment shown in FIGS. 1 and 2 can be manufactured by the method example shown
`below.
`536 図１、２に示す実施例は、つぎに示す方法例により製造することができる。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`539 An assembly obtained by laminating the negative electrode sheet 1 to which the negative
`electrode terminal 5 is welded, the separator 3, and the positive electrode sheet 2 to which
`the positive electrode terminal 6 is welded is placed between the two outer sheets 42 and 43,
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`

`and the outer sheets 42 and 43 are separated. An envelope-shaped exterior body 4 is
`obtained in which three sides are sealed by heat-sealing and only one side is left unsealed.
`Then, the exterior body 4 is filled with a non-aqueous liquid electrolyte under reduced
`pressure, and the remaining one side of the exterior body 4 is sealed by heat sealing while
`maintaining the decompressed state to obtain a sheet-like lithium secondary battery.
`548 負極ターミナル５を溶接した負極シート１、セパレータ３、および正極ターミナル６を溶接し
`た正極シート２を重ねて得たアセンブリを２枚の外装シート４２、４３の間に設置し、外装
`シート４２、４３の３方を熱融着にて封止して一方だけ未封止のままとした封筒状の外装体
`４を得る。 ついで減圧下において外装体４内に非水系の液体電解質を充満し、減圧状態を保
`持したままで外装体４の残る一方を熱融着にて封止してシート状リチウム二次電池を得る。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`[0022]
`558 In the present invention, two sheets of a negative electrode sheet and a positive electrode
`sheet may be simply stacked as shown in FIG. A long negative electrode sheet having
`negative electrode active material layers on both sides may be folded two or more times, and
`the positive electrode sheet may be inserted between each folded layer.
`563 本発明においては、負極シートと正極シートとの二シートを図２に示すように単純に重ねるだ
`けでもよいが、シート状リチウム二次電池の単位面積あたりの電池の容量を大きくするため
`に、例えば両面に負極活物質層を有する１枚の長尺の負極シートを２回以上折り畳み、その
`各折り畳み層間に正極シートを挿入設置させるもよい。
`
`----------------------------------------------------------------------------------------------------------------------------
`
`569 At that time, as the positive electrode sheet, one having positive