NONAQUEOUS ELECTROLYTE BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery in which high rate discharge characteristics can be enhanced by ensuring safety when the battery is abnormal.

SOLUTION: A lithium ion secondary battery 20 has a battery container 7. An electrode group 6 where a positive electrode plate W1 and a negative electrode plate W3 are wound while sandwiching a separator W5 is housed in the battery container 7. A nonaqueous electrolyte is injected into the battery container 7. In the nonaqueous electrolyte, a tetrafluoride lithium borate of a lithium salt is dissolved into a solvent mixture where ethylene carbonate and dimethyl carbonate are mixed. A phosphazene-based flame-resistant agent and a fluorine substitution ether of non-detection flash point are admixed with the nonaqueous electrolyte. Flame resistance and self-extinguishing properties are imparted to the nonaqueous electrolyte by the phosphazene-based flame-resistant agent, and viscosity of the nonaqueous electrolyte decreases by the fluorine substitution ether.

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