US 11,929,487 B2
Method of preparing negative electrode for lithium secondary battery
Oh Byong Chae, Daejeon (KR); Sang Wook Woo, Daejeon (KR); Je Young Kim, Daejeon (KR); Yoon Ah Kang, Daejeon (KR); and Jun Hyuk Song, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 16/771,601
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 25, 2019, PCT No. PCT/KR2019/001126
§ 371(c)(1), (2) Date Jun. 10, 2020,
PCT Pub. No. WO2019/147084, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 10-2018-0009254 (KR), filed on Jan. 25, 2018.
Prior Publication US 2020/0303722 A1, Sep. 24, 2020
Int. Cl. H01M 4/134 (2010.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/1393 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 50/46 (2021.01)
CPC H01M 4/134 (2013.01) [H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/1395 (2013.01); H01M 4/364 (2013.01); H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 50/46 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 7 Claims
 
1. A method of preparing a negative electrode for a lithium secondary battery, comprising:
forming a negative electrode mixture layer on a negative electrode current collector, wherein the negative electrode mixture layer comprises a negative electrode active material, and wherein the negative electrode active material comprises a carbon-based material and a silicon-based material;
disposing lithium metal powder on at least a part of the negative electrode mixture layer;
pressing the negative electrode mixture layer on which the lithium metal powder is disposed;
wetting the pressed negative electrode mixture layer with a first electrolyte solution; and
drying the wet negative electrode mixture layer,
wherein, in the disposition of the lithium metal powder, the lithium metal powder is disposed on at least a part of the negative electrode mixture layer in two or more pattern shapes, wherein each pattern shape is spaced apart from another pattern shape, and
wherein the area in which the lithium metal powder is disposed on the negative electrode mixture layer is 50 to 70% with respect to a total area of a surface of the negative electrode mixture layer, and
an average particle size (D50) of the lithium metal powder is 30 to 50 μm.