Patent ID: 7635542
Filing Date: 2009-12-22
Classification: H01M,Y02E,Y02T

Abstract:
1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte comprising an electrolyte dissolved in a non-aqueous solvent, said negative electrode using a low crystalline carbon coated graphite wherein at least part of the surface of graphite is coated with a low crystalline carbon material having lower crystallinity than that of graphite as a negative electrode active material, and said non-aqueous electrolyte comprising a mixed solvent of propylene carbonate and chain carbonate as a non-aqueous solvent, and a lithium salt which has oxalate complex as an anion; wherein said lithium salt which has oxalate complex as the anion is at least one lithium salt selected from a group of difluoro(oxalate) lithium borate and tetrafluoro(oxalate) lithium phosphate.