Patent ID: 8992795
Filing Date: 2015-03-31
Classification: B29B,B29K,B29L,C01B,H01M,Y02E,Y02P,Y02T,Y10T

Abstract:
1. A method for manufacturing a positive electrode active material for a power storage device, comprising the steps of: performing first heat treatment on a first mixture material in which a compound containing lithium, a compound containing a transition metal, and a compound containing silicon are mixed to obtain first particles; performing first mixing treatment on the first particles to obtain second particles after the first heat treatment; performing second heat treatment on the second particles at a temperature higher than a temperature of the first heat treatment to obtain third particles; performing grinding treatment on the third particles to obtain fourth particles after the second heat treatment; adding a carbon-based material to the fourth particles and performing second mixing treatment to obtain a second mixture; and performing third heat treatment on the second mixture at a temperature lower than a temperature of the second heat treatment to obtain fifth particles, wherein the grinding treatment is performed by a planetary ball mill after adding a solvent to the second particles, wherein the grinding treatment is performed for longer time than the first mixing treatment, wherein an average primary particle size of the fifth particles is smaller than that of the third particles, and wherein each of the first particles, the second particles, the third particles, the fourth particles, and the fifth particles comprises lithium metal silicate.