US 11,837,718 B2
Negative electrode for lithium secondary battery and lithium secondary battery comprising the same
Jun Hyuk Song, Daejeon (KR); Oh Byong Chae, Daejeon (KR); Eun Kyung Kim, Daejeon (KR); and Sang Wook Woo, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 16/642,751
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Oct. 11, 2018, PCT No. PCT/KR2018/011987
§ 371(c)(1), (2) Date Feb. 27, 2020,
PCT Pub. No. WO2019/078544, PCT Pub. Date Apr. 25, 2019.
Claims priority of application No. 10-2017-0134055 (KR), filed on Oct. 16, 2017.
Prior Publication US 2021/0083273 A1, Mar. 18, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/38 (2006.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/364 (2013.01); H01M 4/382 (2013.01); H01M 4/386 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A negative electrode for a lithium secondary battery, comprising:
a negative electrode current collector;
a first negative electrode active material layer present on the negative electrode current collector; and
a second negative electrode active material layer present on the first negative electrode active material layer,
wherein the first negative electrode active material layer comprises two or more kinds of first negative electrode active materials,
wherein the second negative electrode active material layer comprises a second negative electrode active material, and
wherein the second negative electrode active material has an average particle diameter (D50) of 0.1 μm to 10 μm and has a uni-modal particle diameter distribution,
wherein the first negative electrode active materials comprise a carbon-based negative electrode active material and a mixture of one or more selected from the group consisting of Si, particles of silicon oxide (SiOx) (0<x≤2), and a Si-metal alloy as the first negative electrode active material,
wherein the second negative electrode active material consists of a carbon-based negative electrode active material,
wherein the carbon-based negative electrode active material of the second negative electrode active material is selected from the group consisting of natural graphite, Kish graphite, pyrolytic carbon, a mesophase pitch-based carbon fiber, a meso-carbon microbead, mesophase pitch, soft carbon, hard carbon, non-graphitizable carbon, graphitizable carbon, petroleum, and coal tar pitch derived cokes, and
wherein a thickness of the second negative electrode active material layer is in a range of 5% to 50% with respect to a thickness of the first negative electrode active material layer.