US 12,431,481 B2
Method for pre-lithiation of negative electrode, pre-lithiated negative electrode and lithium secondary battery including the same
Seo-Young Jeon, Daejeon (KR); Ye-Ri Kim, Daejeon (KR); Su-Yeon Lee, Daejeon (KR); Oh-Byong Chae, Daejeon (KR); and Seung-Hae Hwang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/800,025
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Feb. 17, 2021, PCT No. PCT/KR2021/002041
§ 371(c)(1), (2) Date Aug. 16, 2022,
PCT Pub. No. WO2021/167353, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 10-2020-0019310 (KR), filed on Feb. 17, 2020.
Prior Publication US 2023/0073365 A1, Mar. 9, 2023
Int. Cl. H01M 4/04 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/0459 (2013.01) [H01M 4/0445 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for pre-lithiation of a negative electrode comprising:
interposing a separator between a lithium ion-supplying metal sheet and a negative electrode to prepare a simple cell;
immersing the simple cell in an electrolyte for pre-lithiation; and
disposing the simple cell immersed in the electrolyte for pre-lithiation between two polymer pads, and carrying out electrochemical charging, while pressurizing the outside of the two polymer pads by using a pressurizing member provided with a pair of jigs, to perform pre-lithiation of the negative electrode,
wherein each of the polymer pads has a thickness of 60% to 90% of a thickness of a corresponding jig of the pair of jigs,
wherein the pressurizing is conducted under a pressure of 0.01-10 kPa.