NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode active material of this nonaqueous electrolyte secondary battery contains a secondary particle wherein primary particles aggregate. When the average particle diameter of the primary particles is A Vm, the average particle diameter of the positive electrode active material is B Vm, the tap density of the positive electrode active material is C g/ml and the true specific gravity of the positive electrode active material is D g/ml, the value (VPr) determined by the following formula: (1-C/D)/(A2 x B3) is not less than 0.0005 but not more than 0.04.