LITHIUM SECONDARY BATTERY

PROBLEM TO BE SOLVED: To realize a lithium secondary battery provided with a negative electrode having a structure composed by properly sticking an active material to a collector by providing the negative electrode composed by holding a mix containing the active material and a binder on the collector containing copper as a main constituent, a positive electrode and a nonaqueous electrolytic solution for the battery, and by imparting a property forming copper and an insoluble salt in a test solution comprising a weak acid aqueous solution to the binder included in the negative electrode. SOLUTION: A negative electrode has a structure composed by holding a mix containing an active material and a binder on a collector containing copper as a main constituent. The binder has a property forming copper and an insoluble salt in a test solution comprising a weak acid aqueous solution such as an ammonium chloride aqueous solution, and for instance, carboxymethyl cellulose or the like can be offered as its example. A separate binder constituent such as a fluorine-based resin can be used together with the binder. In this case, 10-90 wt.% of the separate binder constituent is preferably mixed in the whole binder. The mixing ratios of the active material and the binder are set to 80-99 wt.% and 1-20 wt.%, respectively.