Patent ID: 8986881
Filing Date: 2015-03-24
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. An energy storage element comprising: a positive electrode including a substance that occludes and releases lithium ions, a negative electrode including a substance that occludes and releases lithium ions, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte contains: lithium difluorobis(oxalato)phosphate that is a first additive represented by Formula (1): and lithium tetrafluorooxalatophosphate that is a second additive represented by Formula (2): and an amount of the first additive to be added is not less than 0.3% by weight and not more than 1.0% by weight based on a total weight of the non-aqueous electrolyte, and an amount of the second additive to be added is not less than 0.05 times and not more than 0.3 times the amount of the first additive to be added; and the positive electrode includes a lithium transition metal oxide represented by Li