| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deterioration of capacity accompanying the progress of charge and discharge cycle by using a negative electrode having a specified structure as negative electrode in a nonaqueous electrolyte secondary battery having a positive electrode, a nonaqueous electrolyte containing alkali metal ion, and the negative electrode. SOLUTION: As a negative electrode 2, a negative electrode obtained by filling a mix containing a material capable of storing and releasing alkali metal, preferably, carbon material or a carbon material supporting a metal (e.g. ultra fine particle of silver) capable of forming an alloy with alkali metal, and a metal powder (e.g. copper powder) forming no alloy with alkali metal in a metal current collector (e.g. copper foamed body obtained form polyvinylidene fluoride and copper powder) which is a three-dimensional porous body forming no alloy with alkali metal, preferably, foamed metal or metal felt, is used. Consequently, the reduction in active material utilizing ratio accompanying the thickening of electrode can be reduced. |
