Nonaqueous electrolyte secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakeshi ABE, Toshiyuki KAWAI, Akira KOUYAMA
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Abstract
The invention provides a lithium ion secondary battery which exhibits excellent output characteristics and in which decline in the power characteristics is suppressed for a long period of time even after charge-discharge cycling. The lithium ion secondary battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte solution. The positive electrode has a maximum achievable potential of 4.5 V or more versus metallic lithium. The nonaqueous electrolyte solution includes (A) a nonfluorinated cyclic carbonate, (B) a fluorinated cyclic carbonate, and (C) a fluorinated acyclic carbonate. The nonfluorinated cyclic carbonate (A) accounts for more than 10% by volume of (A), (B) and (C) combined.
Claims22
A nonaqueous electrolyte secondary battery comprising:
- a positive electrode having a maximum achievable potential of 4.5 V or more versus metallic lithium;
- a negative electrode;
- and
- a nonaqueous electrolyte solution comprising a supporting salt and a nonaqueous solvent;
- wherein
- the nonaqueous solvent comprises:
- (A) a nonfluorinated cyclic carbonate;
- (B) a fluorinated cyclic carbonate;
- and
- (C) a fluorinated acyclic carbonate;
- and
- the nonfluorinated cyclic carbonate (A) accounts for more than 10% by volume of (A), (B) and (C) combined.
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Dependencies are inferred from the claim text.