| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery in which deterioration of high rate discharge characteristics can be minimized by ensuring safety when the battery is abnormal.SOLUTION: A lithium ion 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 lithium hexafluorophosphate or a tetrafluoride lithium borate of a lithium salt is dissolved into a solvent mixture containing ethylene carbonate. A phosphazene-based flame-resistant agent as a flame retardant, and an ionic liquid containing a cationic component and an anion component are admixed with the nonaqueous electrolyte. Flame resistance or self-extinguishing properties are imparted to the nonaqueous electrolyte by the phosphazene-based flame-resistant agent, and reduction of ion conductivity is minimized by the ionic liquid. |
