	US 12,142,750 B2
	Method of producing negative electrode for lithium secondary battery
Oh Byong Chae, Daejeon (KR); Sang Wook Woo, Daejeon (KR); and Ye Ri Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/288,044
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 24, 2019, PCT No. PCT/KR2019/014094 § 371(c)(1), (2) Date Apr. 23, 2021, PCT Pub. No. WO2020/085823, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 10-2018-0128789 (KR), filed on Oct. 26, 2018.
Prior Publication US 2021/0384485 A1, Dec. 9, 2021
Int. Cl. H01M 4/04 (2006.01); H01M 4/139 (2010.01); H01M 4/38 (2006.01); H01M 10/058 (2010.01); H01M 10/44 (2006.01); H01M 4/02 (2006.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01)

CPC H01M 4/0445 (2013.01) [H01M 4/0404 (2013.01); H01M 4/139 (2013.01); H01M 4/382 (2013.01); H01M 10/058 (2013.01); H01M 10/446 (2013.01); H01M 2004/027 (2013.01); H01M 4/386 (2013.01); H01M 4/48 (2013.01); H01M 4/587 (2013.01)]

12 Claims

1. A method of producing a negative electrode for a secondary battery, the method comprising:

forming a negative electrode active material layer on a surface of a negative electrode current collector to prepare a negative electrode;

impregnating the negative electrode with a pre-lithiation solution;

pre-lithiating the negative electrode by electrochemically charging the negative electrode using a lithium metal as a counter electrode while the negative electrode is impregnated with the pre-lithiation solution; and

allowing the negative electrode to stand after the pre-lithiation for 90 minutes to 41 hours,

wherein the negative electrode active material layer comprises a negative electrode active material comprising a silicon-based negative electrode material and a carbon-based negative electrode active material,

wherein a weight ratio of the silicon-based negative electrode active material to the carbon-based negative electrode active material is 1:99 to 50:50, and

wherein the charging comprises a low-current charging process performed at least once at a current intensity of 0.1 mA/cm²or more and 1 mA/cm²or less.