JP4678235B2 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- JP4678235B2 JP4678235B2 JP2005144348A JP2005144348A JP4678235B2 JP 4678235 B2 JP4678235 B2 JP 4678235B2 JP 2005144348 A JP2005144348 A JP 2005144348A JP 2005144348 A JP2005144348 A JP 2005144348A JP 4678235 B2 JP4678235 B2 JP 4678235B2
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims description 22
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- 239000007774 positive electrode material Substances 0.000 claims description 20
- 239000007773 negative electrode material Substances 0.000 claims description 15
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- 229910052744 lithium Inorganic materials 0.000 description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Description
正極21は、正極活物質を含有する正極活物質層21bが、正極集電体21aの両面上に形成されたものである。正極集電体21aは、例えばアルミニウム(Al)箔,ニッケル箔あるいはステンレス箔などの金属箔により構成されている。
負極22は、負極活物質を含有する負極活物質層22bが、負極集電体22aの両面上に形成されたものである。負極集電体22aは、例えば銅箔,ニッケル箔あるいはステンレス箔などの金属箔により構成されている。
電解液は、非水溶媒に電解質塩が溶解されたものであり、リチウムイオン電池に一般的に使用される材料が使用可能である。非水溶媒としては、例えば、プロピレンカーボネート、エチレンカーボネート、ジエチルカーボネート、ジメチルカーボネート、メチルエチルカーボネート、γ−ブチロラクトン、テトラヒドロフラン、2−ジメトキシエタン、1,3−ジオキソラン、4−メチル−1,3−ジオキソラン、ジエチルエーテル、スルホラン、メチルスルホラン、アセトニトリルあるいはプロピオニトリル等が好ましく、これらのうちのいずれか1種または2種以上を混合して用いることができる。
セパレータは、例えばポリプロピレン(PP)あるいはポリエチレン(PE)などのポリオレフィン系の材料よりなる多孔質膜、またはセラミック製の不織布などの無機材料よりなる多孔質膜により構成されており、これら2種以上の多孔質膜を積層した構造とされていてもよい。中でも、ポリエチレン、ポリプロピレンの多孔質フィルムが最も有効である。
上述のような正極21および負極22を、正極21、セパレータ25a、負極22、セパレータ25bの順に積層し、セパレータ25bを内側にして巻回して電池素子20とする。固体状あるいはゲル状の電解質を用いる場合は、電解質溶液を正極21および負極22の表面に均一に塗布し、常温もしくは高温雰囲気下で乾燥させ、溶媒を気化・除去して電解質層を形成する。その後セパレータとともに積層して巻回し、電池素子とする。
[正極の作製]
正極活物質としてLiNiO2とLiMn2O4との複合材料を用いて正極を作製する。まず、LiNiO2とLiMn2O4とを6:4の割合で混合し、焼成してリチウム複合材料とする。このリチウム複合材料94重量部と、導電剤としてグラファイト3重量部と、結着剤としてポリフッ化ビニリデン3重量部とを混合して調製し、さらにこれをN−メチル−2−ピロリドンに分散させてスラリー状の正極合剤とした。
粉砕した人造黒鉛粉末90重量部と、結着剤としてポリフッ化ビニリデン10重量部とを混合して調製し、さらにこれをN−メチル−2−ピロリドンに分散させてスラリー状の負極合剤とした。
エチレンカーボネート(EC)50重量部とプロピレンカーボネート(PC)50重量部とを混合し、電解質塩としてLiPF6を0.7mol/kgを溶解させて電解液を作製した。
上述のようにして作製した正極、および負極を、正極、セパレータ、負極、セパレータの順に積層し、巻回して電池素子とする。次いでこの電池素子を電池缶に収容し、内周側負極端子の折り返し量を1mmとして屈曲させ、外側負極端子とともに電池缶に接続した後、内側に安全弁機構およびPTC素子を設けた正極端子板に正極端子を接続し、正極端子板を電池缶に取り付けて直径26mm、高さ650mmの試験用電池とした。なお、試験用電池は5個作製した。
内周側負極端子の折り返し量を5mmとし、他は実施例1と同様にして5個の試験用電池を作製した。
内周側負極端子の折り返し量を13mmとし、他は実施例1と同様にして5個の試験用電池を作製した。
内周側負極端子の折り返し量を0mmとし、他は実施例1と同様にして5個の試験用電池を作製した。
内周側負極端子の折り返し量を0.5mmとし、他は実施例1と同様にして5個の試験用電池を作製した。
内周側負極端子の折り返し量を14mmとし、他は実施例1と同様にして5個の試験用電池を作製した。
1a,21a・・・正極集電体
1b,21b・・・正極活物質層
2,22・・・負極
2a,22a・・・負極集電体
2b,22b・・・負極活物質層
3,23・・・正極端子
4,4a,4b・・・負極端子
5,11・・・電池缶
12a,12b・・・絶縁板
13・・・正極端子板
14・・・安全弁機構
14a・・・ディスク板
15・・・PTC素子
16・・・絶縁封口ガスケット
20・・・電池素子
24a・・・内周側負極端子24a
24b・・・外周側負極端子24b
25,25a,25b・・・セパレータ
26・・・センターピン
Claims (3)
- 負極集電体上に負極活物質層が形成され、上記負極集電体の両端部にそれぞれ第1の負極端子および第2の負極端子が接続された帯状の負極と、正極集電体上に正極活物質層が形成され、上記第1の負極端子および上記第2の負極端子の略中央部に対向する部分に正極端子が接続された帯状の正極とがセパレータを介して積層および巻回された電池素子が構成され、上記電池素子が直径Ammの電池缶に収容された非水電解質二次電池において、
上記電池素子の内周部より導出され、電池素子外周側に屈曲され、さらに電池素子内周側に屈曲された上記第1の負極端子と、上記電池素子の外周部より導出され、電池素子内周側に屈曲された上記第2の負極端子とが電池缶底面部に接続され、
上記第1の負極端子の電池素子外周側に向けて屈曲させた部分から再度電池素子内周側に向けて屈曲させた部分までの長さである折り曲げ量が1mm以上(A/2)mm以下である
非水電解質二次電池。 - 直径26mmの電池缶を有し、上記第1の負極端子の上記折り曲げ量が1mm以上13mm以下である
請求項1に記載の非水電解質二次電池。 - 直径18mmの電池缶を有し、上記第1の負極端子の上記折り曲げ量が1mm以上9mm以下である
請求項1に記載の非水電解質二次電池。
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JP2007335232A (ja) * | 2006-06-15 | 2007-12-27 | Matsushita Electric Ind Co Ltd | 二次電池およびその製造方法 |
JP5294641B2 (ja) * | 2008-01-18 | 2013-09-18 | 三洋電機株式会社 | 密閉電池 |
US8703327B2 (en) * | 2008-06-20 | 2014-04-22 | Samsung Sdi Co., Ltd. | Rechargeable battery and manufacturing method thereof |
JP2014225325A (ja) * | 2011-09-14 | 2014-12-04 | パナソニック株式会社 | 非水電解質二次電池 |
KR101810269B1 (ko) * | 2013-09-24 | 2017-12-18 | 주식회사 엘지화학 | 전극조립체 및 전지케이스간의 결합력이 향상된 이차전지 |
WO2019187775A1 (ja) * | 2018-03-28 | 2019-10-03 | 三洋電機株式会社 | 電池及びその製造方法 |
JPWO2021065336A1 (ja) * | 2019-09-30 | 2021-04-08 | ||
CN113328064B (zh) * | 2021-05-31 | 2023-05-26 | 珠海冠宇电池股份有限公司 | 一种负极片及电池 |
CN113328133B (zh) * | 2021-05-31 | 2023-05-26 | 珠海冠宇电池股份有限公司 | 一种电池 |
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JPH10261439A (ja) * | 1997-03-19 | 1998-09-29 | Sanyo Electric Co Ltd | リチウム二次電池 |
JP2001110453A (ja) * | 1999-10-04 | 2001-04-20 | Sony Corp | 非水電解液二次電池 |
JP2001135299A (ja) * | 1999-11-05 | 2001-05-18 | Sony Corp | 密閉型電池 |
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JPH10261439A (ja) * | 1997-03-19 | 1998-09-29 | Sanyo Electric Co Ltd | リチウム二次電池 |
JP2001110453A (ja) * | 1999-10-04 | 2001-04-20 | Sony Corp | 非水電解液二次電池 |
JP2001135299A (ja) * | 1999-11-05 | 2001-05-18 | Sony Corp | 密閉型電池 |
JP2001256954A (ja) * | 2000-03-10 | 2001-09-21 | Sony Corp | 蓄電装置 |
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