JP2007258050A - 非水電池 - Google Patents
非水電池 Download PDFInfo
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- JP2007258050A JP2007258050A JP2006082374A JP2006082374A JP2007258050A JP 2007258050 A JP2007258050 A JP 2007258050A JP 2006082374 A JP2006082374 A JP 2006082374A JP 2006082374 A JP2006082374 A JP 2006082374A JP 2007258050 A JP2007258050 A JP 2007258050A
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- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】 正極の集電体露出部と前記負極活物質含有層が前記セパレータを介して対向する部分に、その内部に熱可塑性樹脂を分散させた絶縁性樹脂膜を配置するとともに、不要な正極の集電体露出部は設けない。
Description
前記、集電体露出部を設けない方法としては、正極活物質含有層を切断することで集電体露出部を除去する方法が確実であり、好適である。
なお、上記の絶縁樹脂層の製造方法として、溶媒として、一方の樹脂は溶解するが、他の樹脂は溶解しないものを選択することで、溶解しない樹脂の粒子を分散させたスラリーを作製し、そのスラリーを正極集電体やポリオレフィン系のセパレータなどの基材上に、ダイコータ、グラビアコータ、リバースコータ、スプレーコータなどの方法にて塗布乾燥して溶媒を除去することによって得ることが好ましい。
<正極の作製>
正極活物質であるLiCoO285質量部、導電助剤であるアセチレンブラック10質量部、およびバインダであるPVDF5質量部を、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。このペーストを、集電体となる厚さ15μmのアルミニウム箔の両面に、表面の活物質塗布長280mm、裏面の活物質塗布長210mmになるように塗布し、乾燥した後、カレンダー処理を行って、全厚が150μmになるように正極合剤層の厚みを調整後、切断して、長さ302mm、幅43mmの正極を作製した。更にこの正極のアルミニウム箔の露出部に、リードとなるアルミニウム製タブ(幅3mm、厚み80μm)を超音波溶接により接続した。さらに、タブを接続しない側のアルミニウム箔は、塗膜端部から2mmの正極塗膜上で切断することで除去し、最終的に、長さ300mm(表面の活物質塗布長278mm、裏面の活物質塗布長208mm、表面のタブ接続露出部長さ22mm)の正極とした。
平均粒径6μmのポリエチレン粉末[住友精化(株)製「フロービーズLE1080」]1.3gを、PVDFのNMP溶液[KFポリマーL#1120;PVDF濃度12質量%(株)クレハ製]100g中に、(攪拌しながら)投入し、さらに、1時間攪拌して、樹脂層形成用の液状組成物(スラリー)を得た。このスラリーを、ダイコータ(ギャップ:90μm)で、正極の表面および裏面の正極塗膜終端部から10mmの長さで、アルミニウム箔上に塗布した後、NMPを除去して、厚み15μmの絶縁樹脂層を形成した。
負極活物質である黒鉛90質量部と、バインダであるPVDF5質量部とを、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8μmの集電体の両面に、活物質塗布長が表面290mm、裏面230mmになるように塗布し、乾燥した後、カレンダー処理を行って全厚が140μmになるように負極合剤層の厚みを調整後、切断して、長さ300mm(表面の露出部長さ10mm)、幅44mmの負極を作製した。更にこの負極の銅箔の露出部にタブ付けを行った。
上記のようにして得られた絶縁樹脂膜付き正極と負極を、セパレータとしてポリオレフィン製の微多孔性フィルム(厚み18μm、空孔率50%)を介して、正極の集電体露出部が負極と対向する位置に絶縁樹脂膜が配置されるように捲回し、発電体を作製した。その発電体を、アルミニウム合金製電池缶内に挿入して、電解液を注入し、封止を行って非水二次電池を作製した。
<絶縁樹脂層の形成>
平均粒径3μmのポリエチレン粉末[住友精化(株)製「フロービーズLE1080」]を用い、絶縁樹脂層の厚みを6μmにした以外は、実施例1と同様に、非水二次電池を作製した。
ポリプロピレン粉末[セイシン企業製「PPW-5(商品名)」平均粒径:6μm]を用いた以外は実施例1と同様に、非水二次電池を作製した。
架橋PMMA樹脂粉末[ガンツ化成社製「ガンツパール(商品名)」平均粒径:6μm]を用いた以外は実施例1と同様に、非水二次電池を作製した。
タブを接続しない側のアルミニウム箔をそのまま除去せずに残したこと、および、正極塗膜終端部のアルミニウム箔上に絶縁樹脂膜を形成しなかった以外は、実施例1と同様に、非水二次電池を作製した。
正極塗膜終端部のアルミニウム箔上に絶縁樹脂膜を形成しなかった以外は、実施例1と同様に、非水二次電池を作製した。
タブを接続しない側のアルミニウム箔をそのまま除去せずに残したこと以外は、実施例1と同様に、非水二次電池を作製した。
実施例1記載の絶縁樹脂膜層塗布の代わりに、同じ位置に、日東電工製ポリプロピレン粘着テープ[型番No.3703DF(全厚55μm)]を貼付した以外は、実施例1と同様に、非水二次電池を作製した。
<電池厚み>
封止を行った後の電池の最大厚みをノギスにて測定した。
<電池の圧壊試験>
それぞれ10個の電池上の中央部、あるいは、底部に直径15mmの鉄製の丸球を置いて、凹み深さが約1.5mmになるまで上から加圧し、電池温度が100℃を超えた個数を調べた。
各諸特性の結果を表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
11 耐熱性樹脂
12 熱可塑性樹脂
Claims (11)
- 集電体上に正極活物質含有層が形成されてなる正極と、集電体上に負極活物質含有層が形成されてなる負極とを、多孔性のセパレータを介して捲回して構成される発電体を含む非水電池において、前記正極の、捲き始め部もしくは捲き終わり部の少なくともいずれか一方に、外部端子と接続するためのリードを設置するための正極活物質層が形成されない集電体露出部が設けられており、少なくとも、前記正極の集電体露出部と、前記負極の集電体露出部が前記セパレータを介して対向する部分では、前記正極の集電体露出部の上に、2種類以上の樹脂が混合された絶縁樹脂層が形成されており、かつ、前記正極の、前記リードを設置しない捲き始め側端もしくは捲き終わり側端には、集電体露出部が存在しないことを特徴とする非水電池。
- 前記正極の集電体露出部上の前記絶縁樹脂層が、負極の集電体露出部と負極活物質含有層が前記セパレータを介して対向することを特徴とする請求項1記載の非水電池。
- 前記正極のリードを設置しない捲き始め側端もしくは捲き終わり側端の、集電体露出部が設けられていない部分が、正極活物質含有層を切断することで形成されていることを特徴とする請求項1または2記載の非水電池。
- 前記絶縁樹脂層の少なくとも一部が、正極活物質含有層と重なっていることを特徴とする請求項1〜3いずれかに記載の非水電池。
- 電解液による膨潤により、前記絶縁樹脂層の少なくとも一部が、正極の幅よりはみ出していることを特徴とする請求項1〜4いずれかに記載の非水電池。
- 前記絶縁樹脂層の少なくとも一部が、前記発電体と電池外装材との間に介在することを特徴とする請求項1〜5いずれかに記載の非水電池。
- 前記絶縁樹脂層の厚みが、5〜30μmであることを特徴とする請求項1〜6いずれかに記載の非水電池。
- 前記絶縁樹脂層には、PVDFもしくはその誘導体が含まれることを特徴とする請求項1〜7いずれかに記載の非水電池。
- 前記絶縁樹脂層に、ポリエチレン、ポリプロピレン、ポリ(エチレン−プロピレン)共重合体、ポリ(エチレン−酢酸ビニル)共重合体、ポリメチルメタクリレート、ポリ(エチレン−メチルメタクリレート)共重合体およびこれらの誘導体から選ばれる少なくとも1種類の樹脂が含まれることを特徴とする請求項1〜8いずれか記載の非水電池。
- 前記樹脂の形状が、球状、略球状、塊状、繊維状、棒状、粉砕状、もしくは、前記それぞれの形状が加熱変形された状態のいずれかであることを特徴とする請求項9に記載の非水電池。
- 前記樹脂の粒子の大きさが、0.1〜50μmであることを特徴とする請求項9または10記載の非水電池。
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CNA2007101360004A CN101043090A (zh) | 2006-03-24 | 2007-03-15 | 非水电池 |
US11/723,915 US20070224493A1 (en) | 2006-03-24 | 2007-03-22 | Non-aqueous electrolyte battery |
KR1020070028493A KR20070096882A (ko) | 2006-03-24 | 2007-03-23 | 비수전지 |
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- 2007-03-22 US US11/723,915 patent/US20070224493A1/en not_active Abandoned
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Also Published As
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JP4183715B2 (ja) | 2008-11-19 |
CN101043090A (zh) | 2007-09-26 |
KR20070096882A (ko) | 2007-10-02 |
US20070224493A1 (en) | 2007-09-27 |
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