Active material particles for a lithium secondary battery

摘要

Active material particles are provided that exhibit performance suitable for increasing the output of a lithium secondary battery and little deterioration due to charge-discharge cycling. The active material particles provided by the present invention have a hollow structure having secondary particles including an aggregate of a plurality of primary particles of a lithium transition metal oxide, and a hollow portion formed inside the secondary particles, and through holes that penetrates to the hollow portion from the outside are formed in the secondary particles. BET specific surface area of the active material particles is 0.5 to 1.9 m2/g.

主权项

1. Active material particles for a lithium secondary battery, comprising
a plurality of secondary particles, each secondary particle being composed of an aggregate of a plurality of primary particles of a lithium transition metal oxide and a hollow portion formed inside the each secondary particle, wherein the lithium transition metal oxide is a compound having a layered structure that contains nickel as a constituent element thereof, the each secondary particle constitutes an outer shell of the active material particle, the outer shell has through holes that penetrate the outer shell to the hollow portion from the outside, wherein the through holes connect the outside of each active material particle and the hollow portion thereof along a straight line that passes through the through holes, and wherein the average number of through holes is 1 to 10 per particle of the each secondary particle, and BET specific surface area of the active material particles is from 0.5 to 1.9 m2/g.