公开(公告)号：US20210028445A1

公开(公告)日：2021-01-28

申请号：US16982812

申请日：2019-03-20

Applicant: LG Chem, Ltd.

Inventor： Won Sig Jung ,  Seung Beom Cho ,  Sang Soon Choi

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M4/131 ,  H01M4/134 ,  H01M4/1391 ,  H01M4/1395 ,  H01M4/04 ,  H01M10/0525

Abstract: A method of preparing a positive electrode active material that includes introducing a reaction mixture including a lithium source material and a nickel-manganese-cobalt precursor into a continuous firing furnace and subjecting the same to primary heat treatment, thereby preparing a fired mixture; subjecting the fired mixture to pulverization or size classification; and introducing the fired mixture having been pulverized or size-classified into a rotary kiln and subjecting the same to secondary heat treatment, thereby forming a lithium nickel manganese cobalt-based positive electrode active material.

公开(公告)号：US10892471B2

公开(公告)日：2021-01-12

申请号：US16333378

申请日：2018-02-06

Applicant: LG Chem, Ltd.

Inventor： Sang Soon Choi ,  Hyun Ah Park ,  Won Sig Jung

IPC: H01M4/04 ,  C01G53/00 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/02 ,  H01M4/525

Abstract: A method of preparing a positive electrode active material precursor for a lithium secondary battery by using a batch-type reactor, which includes the steps of 1) forming positive electrode active material precursor particles while continuously adding a transition metal-containing solution including a transition metal cation, an aqueous alkaline solution, and an ammonium ion-containing solution to a batch-type reactor, 2) sedimenting the positive electrode active material precursor particles formed; 3) discharging a supernatant formed after the sedimentation of the positive electrode active material precursor particles to an outside; 4) adjusting a pH to 10 to 12 by adding the ammonium ion-containing solution; and 5) growing the positive electrode active material precursor particles while continuously again adding the transition metal-containing solution to the batch-type reactor, and a method of preparing a positive electrode active material using the same.

公开(公告)号：US20200350554A1

公开(公告)日：2020-11-05

申请号：US16614233

申请日：2018-11-23

Applicant: LG Chem, Ltd.

Inventor： Sang Soon Choi ,  Seung Beom Cho ,  Jung Ho Lim ,  Won Sig Jung

IPC: H01M4/04 ,  H01M4/505 ,  H01M4/525

Abstract: A method for preparing a positive electrode active material includes: a step for adding a reaction mixture containing a lithium-raw material and a nickel-manganese-cobalt precursor into a first crucible and performing a first heat treatment at a temperature of 500-800° C. to form a pre-calcinated mixture; a step for extracting the pre-calcinated mixture from the first crucible and pulverizing or classifying the same; and a step for adding the pulverized or classified pre-calcinated mixture into a second crucible and performing a second heat treatment at a temperature of 700-1000° C. under an atmosphere in which an oxygen partial pressure is 20% or less to form a lithium nickel-manganese-cobalt-based positive electrode active material, wherein a volume of the pre-calcinated mixture formed after the first heat treatment is 20-50% with respect to a volume of the reaction mixture added into the first crucible.