Slurry for secondary battery negative electrode, secondary battery negative electrode and manufacturing method thereof, and secondary battery

二次电池负极用浆料、二次电池用负极及其制造方法、以及二次电池

Abstract

本发明提供一种二次电池负极用浆料,其含有电极活性物质、非水溶性聚合物(A)及水溶性聚合物(B),其中,非水溶性聚合物(A)含有(a1)脂肪族共轭二烯单体单元20重量%~60重量%、(a2)烯属不饱和羧酸单体单元0.5重量%~10重量%以及(a3)可与它们共聚的单体单元30重量%~79.5重量%,水溶性聚合物(B)含有(b1)烯属不饱和羧酸单体单元20重量%~60重量%、(b2)(甲基)丙烯酸酯单体单元25重量%~78重量%以及(b3)可与它们共聚的含磺酸基单体单元2重量%~15重量%,非水溶性聚合物(A)和水溶性聚合物(B)的比例(A)/(B)为80/20~95/5。
This slurry for secondary battery negative electrodes contains an electrode active substance, a non-water-soluble polymer (A) and a water-soluble polymer (B). The non-water-soluble polymer (A) contains 20-60 weight% aliphatic conjugated diene monomer units (a1), 0.5-10 weight% ethylenically unsaturated carboxylic acid monomer units (a2), and 30-79.5 weight% monomer units (a3) which are copolymerizable with these. The water-soluble polymer (B) contains 20-60 weight% ethylenically unsaturated carboxylic acid monomer units (b1), 25-78 weight% (meth)acrylic acid ester monomer units (b2), and 2-15 weight% sulfonic acid group-containing monomer units (b3) copolymerizable with these. The ratio (A)/(B) of the non-water-soluble polymer (A) and the water-soluble polymer (B) is 80/20 to 95/5.

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