US 12,080,889 B2
Negative electrode for lithium secondary battery and lithium secondary battery comprising the same
Lilin Piao, Daejeon (KR); Je-Young Kim, Daejeon (KR); Sang-Wook Woo, Daejeon (KR); and Hee-Won Choi, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/256,451
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 31, 2020, PCT No. PCT/KR2020/001546
§ 371(c)(1), (2) Date Dec. 28, 2020,
PCT Pub. No. WO2020/159322, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 10-2019-0013772 (KR), filed on Feb. 1, 2019.
Prior Publication US 2021/0273223 A1, Sep. 2, 2021
Int. Cl. H01M 4/587 (2010.01); H01M 4/04 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/587 (2013.01) [H01M 4/0404 (2013.01); H01M 4/043 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2220/20 (2013.01)] 10 Claims
 
1. A negative electrode for a lithium secondary battery, comprising:
a negative electrode active material layer,
wherein the negative electrode active material layer is formed by steps of coating a negative electrode mixture slurry comprising spheroidized natural graphite particles as a negative electrode active material on at least one surface of a negative electrode current collector, followed by drying and pressing the negative electrode mixture slurry on the at least one surface of the negative electrode current collector,
wherein the spheroidized natural graphite particles comprise a plurality of pores, wherein carbonized pitch is present in the plurality of pores,
wherein the carbonized pitch is solid phase coated by dry method,
wherein the negative electrode active material layer has a Brunauer-Emmett-Teller (BET) specific surface area of the negative electrode active material layer after the pressing that is larger than a BET specific surface area of the negative electrode active material layer before the pressing, wherein a difference in the BET specific surface area before and after pressing ranges from 0.9 m2/g to 1.2 m2/g,
wherein the BET specific surface area of the negative electrode active material layer after pressing ranges from 3.3 m2/g to 3.8 m2/g, and
wherein the negative electrode has degree of orientation of an I004/I110 value of 14 to 23 after pressing.