US 12,255,324 B2
Negative electrode and secondary battery including the same
Tae Gon Kim, Daejeon (KR); Ki Won Sung, Daejeon (KR); Joo Yul Baek, Daejeon (KR); and Min Kwak, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/775,710
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Apr. 21, 2021, PCT No. PCT/KR2021/005040
§ 371(c)(1), (2) Date May 10, 2022,
PCT Pub. No. WO2021/215830, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 10-2020-0048940 (KR), filed on Apr. 22, 2020.
Prior Publication US 2022/0384790 A1, Dec. 1, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/04 (2006.01); H01M 4/134 (2010.01); H01M 4/38 (2006.01); H01M 4/48 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/483 (2013.01) [H01M 4/0404 (2013.01); H01M 4/134 (2013.01); H01M 4/386 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A negative electrode comprising a negative electrode collector, a first negative electrode active material layer disposed on the negative electrode collector, and a second negative electrode active material layer disposed on the first negative electrode active material layer,
wherein the second negative electrode active material layer comprises a second negative electrode active material and a second conductive agent,
wherein the second negative electrode active material comprises a silicon-based active material,
the silicon-based active material comprises SiOx(0≤x<2),
the second conductive agent comprises a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side in a single plane, and
the carbon nanotube structure is included in an amount of 0.01 wt % to 1.0 wt % in the second negative electrode active material layer,
wherein in the carbon nanotube structure, the single-walled carbon nanotube unit has an average diameter of 0.5 nm to 10 nm, and
wherein the carbon nanotube structure has an average diameter of 10 nm to 100 nm.