| abstract |
A battery capacity of a lithium ion secondary battery is substantially improved while maintaining high charge / discharge efficiency and good cycle characteristics. A first negative electrode layer 2a containing carbon as a main component; Second, mainly composed of a film-like material that can permeate the lithium component A secondary battery negative electrode having a multilayer structure including the negative electrode layer 3a and the third negative electrode layer 4a mainly composed of lithium and / or a compound containing lithium is used. |