JP2012014993A - 非水電解液二次電池 - Google Patents
非水電解液二次電池 Download PDFInfo
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- JP2012014993A JP2012014993A JP2010151531A JP2010151531A JP2012014993A JP 2012014993 A JP2012014993 A JP 2012014993A JP 2010151531 A JP2010151531 A JP 2010151531A JP 2010151531 A JP2010151531 A JP 2010151531A JP 2012014993 A JP2012014993 A JP 2012014993A
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Abstract
【解決手段】 リチウム金属複合酸化物を正極活物質として含有する正極、負極、非水電解液およびセパレータを有する非水電解液二次電池であって、前記負極は、SiとOとを構成元素に含む材料(ただし、Siに対するOの原子比xは、0.5≦x≦1.5である)、および黒鉛を負極活物質として含有し、かつアスペクト比が3以上の繊維形状で平均長が10μm以上の黒鉛質導電助剤と、アスペクト比が3以上の繊維形状で平均長が1μm以下の黒鉛質導電助剤とを含有する負極合剤層を、集電体の片面または両面に有していることを特徴とする非水電解液二次電池により、前記課題を解決する。
【選択図】 なし
Description
<正極の作製>
正極活物質であるLiCoO2と、導電助剤であるカーボンブラックと、バインダであるPVDFとを、93:3:4の質量比で含む正極合剤をNMPに分散させて調製した正極合剤含有ペーストを、厚みが10μmのアルミニウム箔(正極集電体)の両面に厚みを調節して間欠塗布し、乾燥した後、カレンダー処理を行って、正極合剤層の厚みが、集電体の片面あたり70μmである正極を作製した。この正極を所定の形状に切断し、アルミニウム箔の露出部にタブを溶接してリード部を形成した。
SiOと黒鉛とを、質量比で2:8で含む混合物(負極活物質)と、バインダであるSBRおよびCMC(質量比で1:2)と、導電助剤である平均アスペクト比が8.6で平均長が13μmの気相成長炭素繊維、および平均アスペクト比が20で平均長が0.2μmのカーボンナノチューブ(質量比で1:1)とを、94:3:3の質量比で含む負極合剤を水に分散させて調製した負極合剤含有ペーストを、厚みが15μmの銅箔(負極集電体)の両面に厚みを調節して間欠塗布し、乾燥した後、カレンダー処理を行って、負極合剤層の厚みが、集電体の片面あたり60μmである負極を作成した。この負極を所定の形状に切断し、銅箔の露出部にタブを溶接してリード部を形成した。
前記のようにして得た正極と負極とを、厚みが20μmのポリエチレン製微多孔膜セパレータを介在させつつ重ね、渦巻状に巻回して巻回電極体を作製した。得られた巻回電極体を押しつぶして扁平状にし、アルミニウム合金製の463450角形外装缶に入れ、非水電解液(エチレンカーボネートとエチルメチルカーボネートとジエチルカーボネートとを体積比で1:1:1で混合した溶媒にLiPF6を濃度1.1mol/lで溶解させ、更にビニレンカーボネートを濃度が1質量%となる量で添加した溶液)を注入した。
導電助剤を、平均アスペクト比が5.2で平均長が40μmの気相成長炭素繊維、および平均アスペクト比が20で平均長が0.2μmのカーボンナノチューブ(質量比で1:1)に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が300で平均長が50μmの気相成長炭素繊維、および平均アスペクト比が20で平均長が0.2μmのカーボンナノチューブ(質量比で1:1)に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が300で平均長が50μmの気相成長炭素繊維、および平均アスペクト比が20で平均長が0.8μmのカーボンナノチューブ(質量比で1:1)に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が300で平均長が50μmの気相成長炭素繊維のみに変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が20で平均長が0.2μmの気相成長炭素繊維のみに変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が30で平均長が5μmの気相成長炭素繊維、および平均アスペクト比が20で平均長が0.2μmのカーボンナノチューブ(質量比で1:1)に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、平均アスペクト比が300で平均長が50μmの気相成長炭素繊維、および平均アスペクト比が160で平均長が1.6μmのカーボンナノチューブ(質量比で1:1)に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
導電助剤を、ケッチェンブラック[ライオン社製「EC600JD(商品名)」]に変更した以外は、実施例1と同様にして負極を作製し、この負極を用いた以外は実施例1と同様にして非水電解液二次電池を作製した。
2 正極
3 セパレータ
Claims (3)
- リチウム金属複合酸化物を正極活物質として含有する正極、負極、非水電解液およびセパレータを有する非水電解液二次電池であって、
前記負極は、SiとOとを構成元素に含む材料(ただし、Siに対するOの原子比xは、0.5≦x≦1.5である)、および黒鉛を負極活物質として含有し、かつアスペクト比が3以上の繊維形状で平均長が10μm以上の黒鉛質導電助剤と、アスペクト比が3以上の繊維形状で平均長が1μm以下の黒鉛質導電助剤とを含有する負極合剤層を、集電体の片面または両面に有していることを特徴とする非水電解液二次電池。 - アスペクト比が3以上の繊維形状で平均長が10μm以上の黒鉛質導電助剤の、負極合剤層における含有量が、0.1〜2質量%である請求項1に記載の非水電解液二次電池。
- アスペクト比が3以上の繊維形状で平均長が1μm以下の黒鉛質導電助剤の、負極合剤層における含有量が、0.1〜2質量%である請求項1または2に記載の非水電解液二次電池。
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |