NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with high output and long life.

SOLUTION: A cylindrical lithium ion battery is manufactured in such a way that a positive electrode using lithium manganate in a positive active material and a negative electrode using amorphous carbon in a negative active material are wound through a separator to prepare a wound group, the wound group is impregnated with a nonaqueous electrolyte prepared by dissolving the specified concentration of LiPF6in a mixed solvent of ethylene carbonate and dimethyl carbonate, and housed in a battery container. The concentration of LiPF6in the mixed solvent is specified to 1.2 mol/liter or more but 1.6 mol/ liter or less. The amount of lithium ions enough for electrode reaction is ensured, and increase in viscosity of the nonaqueous electrolyte is suppressed.

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