JP5148142B2 - 非水電解質電池 - Google Patents
非水電解質電池 Download PDFInfo
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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
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Description
本実施例では、図1の捲回体の構成に対応する部材には同一の符号を付けて説明する。
正極活物質であるLiCoO2:80重量部と、導電助剤であるアセチレンブラック:10重量部と、バインダーであるPVDF:5重量部を、N−メチル−2−ピロリドン(NMP)を溶剤として均一になるように混合して、正極合剤含有ペーストを調製した。この正極合剤含有ペーストを、正極集電体1となる厚さ15μmのアルミニウム箔の両面に、活物質塗布長が表面281mm、裏面212mm(正極集電体露出部8が69mm)になるように間欠塗布し、乾燥した。その後、カレンダー処理を行って、全厚が150μmになるように正極活物質含有層2の厚みを調整し、幅43mmになるように切断して、長さ281mm、幅43mmの正極3を作製した。さらに、この正極3の正極集電体露出部8には、アルミニウム製の正極タブ10を溶接した。
耐熱性樹脂であるPVDFのNMP溶液(固形分濃度:12重量%):100gと、塊状のオキシ水酸化アルミニウム粉末(平均粒径:2μm):88gと、NMP:200gとを容器に入れ、遊星ボールミルで2800rpmの条件で10分間攪拌してスラリーを得た。このスラリーを、90μmのギャップを有するダイコータを用い、正極集電体露出部8に塗布した後、乾燥させ、厚みが15μmの絶縁性樹脂膜9を形成した。上記塗布は、正極集電体露出部8において、正極活物質含有層2の端縁を一端として、正極3の長さ方向に10mmの長さで行った。
負極活物質である黒鉛:90重量部と、バインダーであるPVDF:5重量部とを、NMPを溶剤として均一になるように混合して負極合剤含有ペーストを調製した。この負極合剤含有ペーストを、銅箔からなる厚さ10μmの負極集電体4の両面に、活物質塗布長が表面287mm、裏面228mm(負極集電体露出部が59mm)になるように間欠塗布し、乾燥した。その後、カレンダー処理を行って、全厚が142μmになるように負極活物質含有層5の厚みを調整し、幅45mmになるように切断して、長さ287mm、幅45mmの負極6を作製した。さらに、この負極6の負極集電体露出部に銅製の負極タブを溶接した。
塊状のオキシ水酸化アルミニウム粉末に代えて、板状のオキシ水酸化アルミニウム粉末(平均粒径:2μm、アスペクト比:10):88gを使用した以外は、実施例1と同様にし非水電解質二次電池を作製した。
耐熱性樹脂であるPVDFのNMP溶液(固形分濃度:12重量%):100gと、板状のオキシ水酸化アルミニウム粉末(平均粒径:2μm):44gと、NMP:200gとを容器に入れ、遊星ボールミルで2800rpmの条件で10分間攪拌して分散液を得た。この分散液に熱可塑性樹脂として架橋ポリメチルメタクリレート(PMMA)粉末(平均粒径:1μm):14.7gを加え、プラネタリーミキサーで50rpmの条件で1時間攪拌してスラリーを得た。上記以外は、実施例1と同様にして非水電解質二次電池を作製した。
塊状のオキシ水酸化アルミニウム粉末に代えて、塊状の水酸化マグネシウム粉末〔Mg(OH)2、平均粒径:2μm〕:88gを使用した以外は、実施例1と同様にして非水電解質二次電池を作製した。
板状のオキシ水酸化アルミニウム粉末に代えて、塊状のホウ酸亜鉛粉末〔Zn3(BO3)2、平均粒径:5μm〕:44gを使用した以外は、実施例3と同様にして非水電解質二次電池を作製した。
正極集電体露出部に絶縁性樹脂膜を形成しなかった以外は、実施例1と同様にして非水電解質二次電池を作製した。
実施例1〜5および比較例1の非水電解質二次電池を、それぞれ10個ずつ1.7mの高さからコンクリートの床に100回落下させ、内部短絡の有無を調べた。10個中2個以上電圧低下が認められたものをC、10個中1個電圧低下が認められたものをB、変化がなかったものをAとして評価した。その結果を表1に示す。
2 正極活物質含有層
3 正極
4 負極集電体
5 負極活物質含有層
6 負極
7 セパレータ
8 正極集電体露出部
9 絶縁性樹脂膜
10 正極タブ
Claims (6)
- 正極集電体と、前記正極集電体上に形成された正極活物質含有層とを含む正極、
負極集電体と、前記負極集電体上に形成された負極活物質含有層とを含む負極、および、
前記正極と前記負極との間に配置されたセパレータを備える非水電解質電池であって、
前記正極は、前記正極集電体の一部に前記正極活物質含有層が形成されていない正極集電体露出部を有し、
前記正極集電体露出部と前記負極活物質含有層とが、前記セパレータを介して対向する部分では、それらの間に、150℃以上の耐熱温度を有する耐熱性樹脂を基体とする絶縁性樹脂膜が配置され、
前記絶縁性樹脂膜は、前記正極集電体露出部および前記負極から選ばれる少なくとも1つに接着しており、
前記絶縁性樹脂膜は、オキシ水酸化アルミニウム、水酸化アルミニウム、水酸化マグネシウム、ドーソナイト、水酸化カルシウム、ホウ酸亜鉛およびタルクからなる群から選ばれる少なくとも1種の無機粒子を含むことを特徴とする非水電解質電池。 - 前記耐熱性樹脂は、融点が150℃以上の樹脂である請求項1に記載の非水電解質電池。
- 前記耐熱性樹脂は、ポリフッ化ビニリデンおよびその誘導体より選ばれる少なくとも1種である請求項2に記載の非水電解質電池。
- 前記無機粒子の含有量が、前記絶縁性樹脂膜全体の重量割合で、30重量%以上99重量%以下である請求項1に記載の非水電解質電池。
- 前記絶縁性樹脂膜は、熱可塑性樹脂をさらに含む請求項1に記載の非水電解質電池。
- 前記絶縁性樹脂膜の厚みが、5μm以上30μm以下である請求項1に記載の非水電解質電池。
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US11312871B2 (en) | 2016-05-17 | 2022-04-26 | Samsung Sdi Co., Ltd. | Separator for secondary battery and lithium secondary battery comprising same |
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JP5427046B2 (ja) * | 2010-01-14 | 2014-02-26 | 日立マクセル株式会社 | 非水電解質電池及びその製造方法 |
EP2639876B1 (en) * | 2012-03-15 | 2015-11-18 | Kabushiki Kaisha Toshiba | Nonaqueous electrolyte secondary battery |
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JP4218071B2 (ja) * | 1996-11-28 | 2009-02-04 | Fdk株式会社 | 非水電解液二次電池 |
KR100709205B1 (ko) * | 2001-04-02 | 2007-04-18 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 양극 활물질 조성물 |
JP4177612B2 (ja) * | 2002-07-30 | 2008-11-05 | 株式会社東芝 | リチウムイオン二次電池 |
JP3821434B2 (ja) * | 2002-09-30 | 2006-09-13 | 松下電器産業株式会社 | 電池用電極群およびそれを用いた非水電解液二次電池 |
US20040086782A1 (en) * | 2002-11-01 | 2004-05-06 | Celgard Inc. | Explosion-proof separator for Li-ion secondary batteries |
JP4201619B2 (ja) * | 2003-02-26 | 2008-12-24 | 三洋電機株式会社 | 非水電解質二次電池、及びそれに使用する電極の製造方法 |
US20090117453A1 (en) * | 2005-06-24 | 2009-05-07 | Tonen Chemical Corporation | Multi-layer, microporous polyethylene membrane, and battery separator and battery using same |
US8932748B2 (en) * | 2005-10-24 | 2015-01-13 | Toray Battery Separator Film Co., Ltd | Multi-layer, microporous polyolefin membrane, its production method, and battery separator |
JP5196780B2 (ja) * | 2005-12-22 | 2013-05-15 | 旭化成イーマテリアルズ株式会社 | 多層多孔膜およびその製造方法 |
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US11312871B2 (en) | 2016-05-17 | 2022-04-26 | Samsung Sdi Co., Ltd. | Separator for secondary battery and lithium secondary battery comprising same |
US11584861B2 (en) | 2016-05-17 | 2023-02-21 | Samsung Sdi Co., Ltd. | Separator for rechargeable battery and rechargeable lithium battery including the same |
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