LITHIUM ION SECONDARY BATTERY AND BATTERY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a long-life lithium ion secondary battery by restoring the capacity of the lithium ion battery.SOLUTION: To solve the above problem, a lithium ion battery according to the invention comprises: a positive electrode; a negative electrode; an electrolyte; and a third electrode serving to supplement lithium ions to at least one of the positive and negative electrodes. The third electrode includes a material which releases Li. The potential of the material which releases Liis 1.8 V or larger based on Li/Li.SELECTED DRAWING: Figure 1