Cathode active material, cathode, and nonaqueous electrolyte secondary battery

摘要

The present application provides a nonaqueous electrolyte secondary battery which includes a cathode having a cathode active material layer, an anode, and a nonaqueous electrolyte, wherein the cathode active material layer includes secondary particles of a lithium phosphate compound having olivine structure, an average particle diameter A of primary particles constituting the secondary particles is 50 nm or more and 500 nm or less, and a ratio B/A of a pore diameter B of the secondary particles to the average particle diameter A of the primary particles is 0.10 or more and 0.90 or less.

主权项

1. A nonaqueous electrolyte secondary battery comprising:
a cathode having a cathode active material layer; an anode; and a nonaqueous electrolyte, wherein: the cathode active material layer includes secondary particles constituted by primary particles; the primary particles are carbon material-coated lithium phosphate compound particles; an average particle diameter A of primary particles is 50 nm or more and 500 nm or less; a ratio B/A of a pore diameter B of the secondary particles to the average particle diameter A of the primary particles is 0.10 or more and 0.75 or less; the average diameter A is an average particle diameter of a total diameter of the carbon-coated lithium phosphate compound particles including carbon, and the pore diameter B is a diameter of a void present between the carbon-coated lithium phosphate compound particles.