JP5791031B2 - 二次電池用電極バインダー及びこれを用いた二次電池 - Google Patents
二次電池用電極バインダー及びこれを用いた二次電池 Download PDFInfo
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- JP5791031B2 JP5791031B2 JP2011553963A JP2011553963A JP5791031B2 JP 5791031 B2 JP5791031 B2 JP 5791031B2 JP 2011553963 A JP2011553963 A JP 2011553963A JP 2011553963 A JP2011553963 A JP 2011553963A JP 5791031 B2 JP5791031 B2 JP 5791031B2
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- Prior art keywords
- secondary battery
- electrode
- anode
- binder
- active material
- Prior art date
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Classifications
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- H01M4/625—Carbon or graphite
-
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Description
ポリアクリロニトリル(polyacrylonitrile、PAN)をバインダーとして用い、下記の接着力及び結着力の測定試験を行った。
重量平均分子量が1,150,000であるポリアクリロニトリル(polyacrylonitrile、PAN)バインダーをN-メチル-2-ピロリドン(N-methyl-2-pyrrolidone:NMP)に溶解させて電極バインダー溶液を得た後、銅箔フィルム上に塗布し、120℃で大凡6時間の間乾燥させてバインダーフィルムを得た。前記方法でバインダーコーティングされた銅箔を5mm間隔に裁断した後、図1に示すように180°ピールテスト(peel test)を行ってバインダーと銅箔の接着力(adhesion force)を測定しており、その結果を表1に示した。
重量平均分子量が1,150,000であるポリアクリロニトリル(polyacrylonitrile、PAN)バインダーに、金属酸化物系SiO-C複合体のアノード粉末をバインダー:アノード粉末=10重量部:90重量部の割合で混合し、これらを溶媒のNMPに入れ混合して均一なスラリーを製造した。その後、前記スラリーを銅箔に3.78mg/cm2で塗布し、18μmの厚さになるようロールプレス(roll press)してアノード電極を得た。製作されたそれぞれのアノードを1cm間隔に裁断した後、スコッチテープ(Scotch Tape)を利用して180°ピールテストを進めており、その結果を表1に記載した。
ポリアクリロニトリル(polyacrylonitrile、PAN)に代えて、比較例1はポリビニリデンフルオリド(polyvinylidene fluoride、PVdF)をバインダーとして用い、比較例2は4,4'-ビフタル酸無水物(Biphthalic anhydride、BPDA)と4,4'-オキシジフェニレンジアミン(oxydiphenylene diamine、ODA)を縮重合して得たポリイミド(polyimide、PI)をバインダーとして用いたことを除いては、実施例1と同一の方法で接着力及び結着力の測定試験を行った。なお、その結果を下記表1に記載した。
エチレンカーボネイト(EC)及びジエチルカーボネイト(DEC)を体積比3:7で混合した非水電解液溶媒に、1MのLiPF6を添加して非水電解液を製造した。
重量平均分子量が150,000のポリアクリロニトリル(polyacrylonitrile、PAN)を用いたことを除いては、実施例2と同一の方法でリチウム二次電池を製造した。
ポリアクリロニトリル(polyacrylonitrile、PAN)に代えて、比較例3は前記比較例1で用いられたポリビニリデンフルオリド(polyvinylidene fluoride、PVdF)をバインダーとして用い、比較例4は前記比較例2で用いられた4,4'-ビフタル酸無水物(Biphthalic anhydride、BPDA)と4,4'-オキシジフェニレンジアミン(oxydiphenylene diamine、ODA)を縮重合して得たポリイミド(polyimide、PI)をバインダーとして用いたことを除いては、実施例2と同一の方法でリチウム二次電池を製造した。
前記実施例2、3及び比較例3、4で製造された二次電池を25℃で5mVまで0.1Cの速度で充電し、5mVで0.005Cの電流となるまで充電し、1Vまで0.1Cの速度で放電して2回充/放電した後、同一の方法で、0.5C/0.5Cの速度で充/放電した。50サイクル後、電池の寿命特性、電池の厚さ増加率を下記のように測定しており、その結果を下記表2に示した。
* 寿命特性(%)= 50th放電容量(mAh)/1st放電容量(mAh)x 100
* 電池の厚さ増加率(%)=(50th充電状態の電極の厚さ−サイクル前の電極の厚さ)/サイクル前の電極の厚さ x 100
Claims (5)
- 二次電池用アノードであって、
リチウムを可逆的に吸蔵及び放出することができるアノード活物質と、
高分子を含む二次電池のアノード用バインダーと、
電極集電体とを備え、
前記高分子が、前記アノード活物質との結着力(cohesion force)が100gf/cm以上であり、
電極集電体との接着力(adhesion force)が0.1〜70gf/mmであり、
重量平均分子量が150,000〜5,000,000であるポリアクリロニトリル(polyacrylonitrile)であり、
前記アノード活物質が、SiOx(0<x<2)と炭素材との複合体であり、
前記電極集電体は銅箔であることを特徴とする、二次電池用アノード。 - 前記炭素材が、カーボン、石油コーク、活性化カーボン、カーボンナノチューブ、黒鉛及び炭素纎維からなる群から選択されることを特徴とする、請求項1に記載の二次電池用アノード。
- 前記二次電池のアノード用バインダー及び前記アノード活物質が、二次電池のアノード用バインダー:前記アノード活物質=3〜20重量部:80〜97重量部の割合で含まれることを特徴とする、請求項1または2に記載の二次電池用アノード。
- 前記二次電池用アノードが、パッキング密度(packing density)が1.2〜1.6g/ccであることを特徴とする、請求項1から3のいずれか1項に記載の二次電池用アノード。
- 二次電池であって、
カソードと、アノードと、分離膜と、及び電解液を備えてなり、
前記アノードが、請求項1から4の何れか一項に記載の二次電池用アノードであることを特徴とする、二次電池。
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PCT/KR2010/001621 WO2010107229A2 (ko) | 2009-03-16 | 2010-03-16 | 이차전지용 전극바인더 및 이를 사용한 이차전지 |
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US20100323242A1 (en) | 2010-12-23 |
WO2010107229A3 (ko) | 2010-12-09 |
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JP2012519948A (ja) | 2012-08-30 |
KR101090598B1 (ko) | 2011-12-08 |
KR20100104020A (ko) | 2010-09-29 |
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