JP2005285429A - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
- Publication number
- JP2005285429A JP2005285429A JP2004094984A JP2004094984A JP2005285429A JP 2005285429 A JP2005285429 A JP 2005285429A JP 2004094984 A JP2004094984 A JP 2004094984A JP 2004094984 A JP2004094984 A JP 2004094984A JP 2005285429 A JP2005285429 A JP 2005285429A
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- JP
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- Prior art keywords
- negative electrode
- active material
- material layer
- electrode active
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 11
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- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
Images
Classifications
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
【解決手段】 本発明の非水電解質二次電池は、外装材と、外装材内に収納され、Liの吸蔵放出電位が金属リチウムの電位に対して0.4Vよりも貴となる負極活物質層形成領域及び負極端子が端部に接続された負極活物質層未形成領域を備えるアルミニウム又はアルミニウム合金からなる負極集電体を有する負極と、負極とセパレータを介するように形成され、負極活物質層及び負極活物質層未形成領域の負極集電体と対向するように形成されLiを吸蔵放出する正極活物質層を有する正極と、負極活物質層未形成領域の負極集電体に引張応力又はせん断応力を与えうる手段と、外装材内に充填された非水電解質とを具備することを特徴とする。
【選択図】 図2
Description
引張応力又はせん断応力を与えうる手段としては、常時負荷型及び条件作動型が挙げられる。非水電解質二次電池の用途、電極群の形状、負極集電体の強度等により適宜選択される。
負極は、例えば、負極活物質、導電剤および結着剤を適当な溶媒に分散させて得られる負極活物質層を、負極集電体の片面もしくは両面に塗布することにより作製する。
正極は、例えば、正極活物質、導電剤および結着剤を適当な溶媒に分散させて得られる正極活物質層を、正極集電体の片側もしくは両面に塗布することにより作製する。
なお、一般に、5V以上の電位では、非水電解質は分解する。このため、正極のLi吸蔵放出電位は、5V程度までが好ましい。
セパレータには多孔質セパレータを用いる。
非水電解質としては、電解質を有機溶媒に溶解することにより調整される液状非水電解質、液状電解質と高分子材料を複合化したゲル状非水電解質、またはリチウム塩電解質と高分子材料を複合化した固体非水電解質が挙げられる。また、リチウムイオンを含有した常温溶融塩(イオン性融体)を使用してもよい。
外装材としては、金属製容器やラミネートフィルム等を用いる。形状は、扁平型、角型、円筒型が好ましい。
捲回型非水電解質二次電池について説明する。便宜上、引張応力又はせん断応力を与えうる手段は、熱収縮性樹脂テープとする。
積層型非水電解質二次電池について説明する。便宜上、引張応力又はせん断応力を与えうる手段は、ばねとする。
正極活物質としてリチウムコバルト酸化物(LiCoO2)、導電材として黒鉛粉末、結着剤としてポリフッ化ビニリデン(PVdF)を重量比で87:8:5となるように配合してn−メチルピロリドン(NMP)溶媒に分散してスラリーを調整した後、厚さ15μmのアルミニウム箔(純度99.99%)に塗布、乾燥、プレス工程を経て、51mm×470mmの長方形状であり電極密度3.5g/cm3の正極を作成した。
実施例1と同様に正極と負極を作製した。正極は、高さ約55mm幅約75mmの正極活物質層塗布部の端部に高さ約10mm幅約7mmの正極活物質層未塗布の正極集電体が位置するように裁断した。負極は、高さ約55mm幅約70mmの負極活物質層塗布部の端部に高さ約10mm幅約9mmの負極活物質層未塗布の負極集電体が位置するように裁断した。
板ばねの代わりに、変態温度が約100℃であるTi-Ni系形状記憶合金からなる板ばね状の部材を用いた他は、実施例2と同様にして非水電解質二次電池を作製した。
熱収縮性樹脂テープの代わりに、収縮性のないテフロン(R)基材を用いた他は、実施例1と同様にして非水電解質二次電池を作製した。
板ばねを用いない他は実施例2と同様に非水電解質二次電池を作製した。
負極活物質層は、高さ約55mm幅約75mmとし、領域Aを形成しないようにした他は、比較例2と同様に非水電解質二次電池を作製した。
2 負極端子
3 正極
3a 正極集電体
3b 正極活物質層
4 負極
4a 負極集電体
4b 負極活物質層
5 セパレータ
6 外装材
7 熱収縮性樹脂テープ
8 粘着剤
9 領域A
10 ばね
Claims (7)
- 外装材と、
前記外装材内に収納され、Liの吸蔵放出電位が金属リチウムの電位に対して0.4Vよりも貴となる負極活物質層形成領域及び負極端子が端部に接続された負極活物質層未形成領域を備えるアルミニウム又はアルミニウム合金からなる負極集電体を有する負極と、
前記負極とセパレータを介するように形成され、前記負極活物質層及び前記負極活物質層未形成領域の前記負極集電体と対向するように形成されLiを吸蔵放出する正極活物質層を有する正極と、
前記負極活物質層未形成領域の前記負極集電体に引張応力又はせん断応力を与えうる手段と、
前記外装材内に充填された非水電解質とを具備することを特徴とする非水電解質二次電池。 - 前記負極活物質層未形成領域の前記負極集電体と対向するように形成された前記正極活物質層は、電流経路を跨るように形成されることを特徴とする請求項1記載の非水電解質二次電池。
- 前記正極、前記セパレータ及び前記負極は、前記負極が外側になるように渦巻き状に捲回された電極群を為し、前記引張応力を与えうる手段は前記負極活物質層未形成領域の前記負極集電体に坦持することを特徴とする請求項1又は2に記載の非水電解質二次電池。
- 前記正極、前記セパレータ及び前記負極は、一以上に積み重ねられた電極群を為し、前記せん断応力を与えうる手段は、一以上の前記負極活物質層未形成領域の前記負極集電体に近接して備えられることを特徴とする請求項1又は2に記載の非水電解質二次電池。
- 前記引張応力を与えうる手段は、熱収縮性樹脂テープであることを特徴とする請求項1、2又は3に記載の非水電解質二次電池。
- 前記せん断応力を与えうる手段は、ばねであることを特徴とする請求項1、2又は4に記載の非水電解質二次電池。
- 前記せん断応力を与えうる手段は、形状記憶合金からなるばね状部材であることを特徴とする請求項1、2又は4に記載の非水電解質二次電池。
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CNB2005100697331A CN100448091C (zh) | 2004-03-29 | 2005-03-29 | 无水电解质二次电池 |
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JP2020013789A (ja) * | 2018-07-17 | 2020-01-23 | 三星エスディアイ株式会社Samsung SDI Co., Ltd. | 二次電池 |
JP7432444B2 (ja) | 2020-06-09 | 2024-02-16 | セイコーインスツル株式会社 | 電気化学セルの製造方法および電気化学セル |
Also Published As
Publication number | Publication date |
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KR100779282B1 (ko) | 2007-11-23 |
US7807283B2 (en) | 2010-10-05 |
CN1677735A (zh) | 2005-10-05 |
KR20060044822A (ko) | 2006-05-16 |
JP4495994B2 (ja) | 2010-07-07 |
CN100448091C (zh) | 2008-12-31 |
US20050221173A1 (en) | 2005-10-06 |
US20090130543A1 (en) | 2009-05-21 |
US7482090B2 (en) | 2009-01-27 |
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