	US 12,424,609 B2
	Method for pre-sodiation of negative electrode, pre-sodiated negative electrode, and lithium secondary battery comprising same
Oh-Byong Chae, Daejeon (KR); Ye-Ri Kim, Daejeon (KR); and Seung-Hae Hwang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/635,586
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Sep. 4, 2020, PCT No. PCT/KR2020/011987 § 371(c)(1), (2) Date Feb. 15, 2022, PCT Pub. No. WO2021/045580, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 10-2019-0110928 (KR), filed on Sep. 6, 2019.
Prior Publication US 2022/0302427 A1, Sep. 22, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/13 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/139 (2010.01); H01M 4/1395 (2010.01); H01M 4/587 (2010.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01); H01M 10/056 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/0459 (2013.01) [H01M 4/0445 (2013.01); H01M 4/13 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/139 (2013.01); H01M 4/1395 (2013.01); H01M 4/587 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 10/056 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0025 (2013.01)]

16 Claims

1. A method for pre-sodiation of a negative electrode, comprising the steps of:

interposing a separator between a sodium ion-supplying metal sheet and a negative electrode to prepare a simple cell;

dipping the simple cell in an electrolyte for pre-sodiation; and

electrochemically charging the simple cell dipped in the electrolyte for pre-sodiation to carry out pre-sodiation of the negative electrode,

wherein the electrochemical charging is carried out while the simple cell is pressurized under a pressure of from 100 kPa to 1,000 kPa,

wherein the negative electrode is a carbon electrode comprising a negative electrode active material, and

wherein the negative electrode active material comprises hard carbon.