| 摘要 |
PROBLEM TO BE SOLVED: To improve a cycle characteristic. SOLUTION: A lithium ion socondary battery is composed of a positive electrode having a lithium-cobalt composite oxide or a lithium-nickel composite oxide served as an active material; a negative eletrode having a carbon material served as an active material in which lithium ions are released and penetrated; and a nonaqueous electrolyte. The nonaqueous electrolyte contains catechol. |
