US 12,170,354 B2
Method of preparing lithium secondary battery
Gui Long Jin, Daejeon (KR); Seung He Woo, Daejeon (KR); and Hyo Sik Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on May 25, 2021, as Appl. No. 17/329,631.
Application 17/329,631 is a continuation of application No. PCT/KR2019/016401, filed on Nov. 26, 2019.
Claims priority of application No. 10-2018-0147161 (KR), filed on Nov. 26, 2018.
Prior Publication US 2021/0280917 A1, Sep. 9, 2021
Int. Cl. H01M 10/0585 (2010.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/139 (2010.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01); H01M 50/409 (2021.01); H01M 50/491 (2021.01); H01M 50/531 (2021.01); H01M 4/02 (2006.01)
CPC H01M 10/0585 (2013.01) [H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/139 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 50/409 (2021.01); H01M 50/491 (2021.01); H01M 50/531 (2021.01); H01M 2004/027 (2013.01); H01M 2300/0068 (2013.01); H01M 2300/0082 (2013.01); Y10T 29/49115 (2015.01)] 6 Claims
OG exemplary drawing
 
1. A method of preparing a lithium secondary battery, the method comprising:
preparing a negative electrode by forming a negative electrode active material layer on opposite surfaces of a current collector, the negative electrode having a negative electrode tab;
preparing a lithium foil having an opening formed at a center thereof and having a closed band shape, in which lithium is coated on one surface or opposite surfaces of a copper foil;
disposing the negative electrode in the opening of the lithium foil such that the negative electrode does not to overlap the lithium foil except for the negative electrode tab such that the negative electrode tab contacts the lithium foil, and preventing a portion, where the negative electrode tab and the lithium foil are in contact with each other, from being coated with the lithium;
disposing a separator on at least one surface of a structure formed after disposing the negative electrode in the opening of the lithium foil;
disposing a positive electrode on the separator to form a stack; and
accommodating the stack in a battery case, and injecting a liquid electrolyte into the battery case to form a solid electrolyte interface (SEI) at initial stage of charging to prevent a reaction of the lithium ions with the negative electrode or other materials during charging and discharging.