| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery anode binder that has good adhesion to the current collector and excellent electrolyte resistance, and that enables to obtain a battery having excellent cycle efficiency when used, particularly, for a lithium ion secondary battery using a conductive carbonaceous material as an anode active substance. SOLUTION: This is a secondary battery anode binder that uses a conductive carbonaceous material as an active substance and the binder is a copolymer latex that is obtained by emulsifying and polymerizing, in the existence of 0.6-3.0 pts.wt. of α-methylstyrene dimer, the total 100 pts.wt. of monomers consisting of an aliphatic group-conjugated diene system monomer 20-60 wt.%, ethylene system unsaturated carbonic acid monomer 1-10 wt.%, and the other monomers 30-79 wt.% that are capable of co-polymerization with these. The quantity of α-methylstyrene dimer that remains in the copolymer latex is 400-3000 ppm against the solid portion of the copolymer latex. |
