The nonaqueous electrolyte secondary battery

文件类型：PDF文档
文件大小：307K
Provided is a nonaqueous electrolyte secondary battery capable of limiting an increase in DCR which occurs after the battery has been subjected to cycles of charging and discharging. A nonaqueous electrolyte secondary battery according to an exemplary embodiment includes a positive electrode including a positive electrode active material. The positive electrode active material includes a secondary particle of a lithium transition metal oxide which is formed by coagulation of primary particles of the lithium transition metal oxide and secondary particles of a rare earth compound which are each formed by coagulation of primary particles of the rare earth compound. The secondary particles of the rare earth compound are each deposited on a groove between a pair of adjacent primary particles of the lithium transition metal oxide, the groove being formed in a surface of the secondary particle of the lithium transition metal oxide, so as to come into contact with both of the pair of adjacent primary particles of the lithium transition metal oxide in the groove. The nonaqueous electrolyte includes lithium difluorophosphate.