LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a means capable of suppressing corrosion of a positive electrode collector in a lithium ion secondary battery.

SOLUTION: A lithium ion secondary battery 10 has a power generation element 21 which includes unit cell layers 19. Each unit cell layer includes: a positive electrode comprising a positive electrode active material layer 15 formed on a surface of a positive electrode collector 12; a negative electrode comprising a negative electrode active material layer 13 formed on a surface of a negative electrode collector 11; and an electrolyte layer 17 interposed between the positive electrode active material layer and the negative electrode active material layer and containing a liquid electrolyte. At least one of the positive electrode collectors contains stainless steel, and the liquid electrolyte contains dodecaborate fluoride expressed by the following chemical formula 1, Li2B12FxH12-x. In the formula, x represents 4-12.

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