US 12,463,199 B2
Method of pre-lithiating negative electrode for all-solid-state secondary batteries and secondary battery using the same
Ji Hoon Ryu, Daejeon (KR); Eun Bee Kim, Daejeon (KR); Jung Pil Lee, Daejeon (KR); and Suk Woo Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/440,137
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Apr. 28, 2020, PCT No. PCT/KR2020/005593
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2020/226324, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 10-2019-0053695 (KR), filed on May 8, 2019.
Prior Publication US 2022/0158171 A1, May 19, 2022
Int. Cl. H01M 4/1395 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/134 (2010.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01)
CPC H01M 4/1395 (2013.01) [H01M 4/0459 (2013.01); H01M 4/134 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 10/0562 (2013.01); H01M 2300/0071 (2013.01); H01M 2300/0082 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of manufacturing an all-solid-state secondary battery, the method comprising a pre-lithiation process comprising:
(a) preparing a powder mixture comprising a negative electrode active material, a plurality of solid electrolyte particles, and a conductive agent;
wherein the negative electrode active material, the solid electrolyte particles, and the conductive agent commonly abut to form a triple point in the powder mixture,
(b) bringing the powder mixture into contact with lithium metal to form a pre-lithiated powder mixture, wherein pre-lithiation is performed at a temperature of 45° C. to 80° C.; and
(c) mixing the pre-lithiated powder mixture with a binder and a solvent to form a slurry,
wherein the pre-lithiation process is performed for one week to four weeks, and
wherein a solid electrolyte interface (SEI) layer having uniform lithium content is formed through the pre-lithiation process on the negative electrode active material, and
wherein the powder mixture is mixed in a dry state.