LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery hardly decreasing discharge capacity and hardly increasing internal resistance when charge and discharge are repeated at a high temperature.

SOLUTION: The lithium ion secondary battery is equipped with at least a positive electrode, a negative electrode, and a nonaqueous electrolyte prepared by dissolving an electrolyte in a nonaqueous solvent. The positive electrode contains a lithium transition metal composite oxide as a positive active material, and the negative electrode 3 contains a titanium oxide as a negative active material. The nonaqueous electrolyte contains a main component electrolyte comprising LiPF6and a sub-component electrolyte represented by general formula (1) as the electrolyte.

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