Patent ID: 11862784
Assignee: nan
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A process for making a cathode active material for a lithium ion battery, said process comprising:
(a) synthesizing a mixed oxide of formula Li1+xTM1−xO2 at a temperature ranging from 750 to 1000° C. in an oxidizing atmosphere, wherein TM is a combination of two or more transition metals selected from the group consisting of Mn, Co and Ni and, optionally, at least one more metal selected from the group consisting of Ba, Al, Zr, W, Fe, Cr, K, Mo, Nb, Mg, Na and V, and x ranges from zero to 0.2,
(b) cooling down the mixed oxide obtained from (a) to a temperature ranging from 100 to 400° C.,
(c) forming sulfate and/or sulfite on a surface of the mixed oxide by reacting the mixed oxide with at least one reactant selected from the group consisting of SO2 and SO3 at the temperature of 100 to 400° C., and
(d) cooling down to a temperature of 50° C. or below.