CATHODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2023/101512

A1

The present invention relates to: a cathode active material preparation method, which can minimize the surface deterioration of a cathode active material, occurring during washing, effectively control remaining lithium, and form a uniform coating layer on the surface of the cathode active material; and a cathode active material prepared thereby, and to a cathode active material preparation method and a cathode active material prepared thereby, the method comprising the steps of: (A) preparing a lithium transition metal oxide; (B) mixing the lithium transition metal oxide and a first washing solution so as to primarily wash the lithium transition metal oxide, and then primarily filter same; (C) using a second washing solution so as to simultaneously secondly wash and secondly filter the lithium transition metal oxide, having passed through step (B), by means of a filtration device capable of performing washing and filtration at the same time; and (D) drying the lithium transition metal oxide, having passed through step (C), and then mixing the dried lithium transition metal oxide and a coating element-containing material and heating same, thereby forming a coating layer, wherein the coating element-containing material comprises a boron-containing material and a lithium-containing material selected from LiOH, Li2CO3 and Li2O.

MOK DUCK GYUN (KR)
LEE HYUCK (KR)
SON MIN HEE (KR)

PCT/KR2022/019507

June 08, 2023

December 02, 2022

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LG CHEMICAL LTD (KR)

H01M4/36; C01G53/00; H01M4/02; H01M4/505; H01M4/525; H01M4/62; H01M10/052

KR20170076222A	2017-07-04
KR20150050458A	2015-05-08
JP2012089406A	2012-05-10
KR20190078720A	2019-07-05
KR20200022313A	2020-03-03

BAE, KIM & LEE IP (KR)

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