| 摘要 |
A binder which is composed of a reaction product between a polymer that has a carboxyl group in at least some side chains and a compound of a metal element that is selected from among copper (Cu), nickel (Ni) and cobalt (Co) is used together with a negative electrode active material for the formation of a negative electrode active material layer. By using this binder, the initial efficiency and the capacity retention rate after a cycle test of a secondary battery are improved. |
