US 12,255,320 B2
Negative electrode, secondary battery and device comprising same
Mingkui Guo, Ningde (CN); and Tiansheng Wang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Jan. 31, 2023, as Appl. No. 18/103,531.
Application 18/103,531 is a continuation of application No. 17/150,096, filed on Jan. 15, 2021, granted, now 11,600,816.
Application 17/150,096 is a continuation of application No. PCT/CN2020/078166, filed on Mar. 6, 2020.
Claims priority of application No. 201910169334.4 (CN), filed on Mar. 6, 2019.
Prior Publication US 2023/0170474 A1, Jun. 1, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/00 (2006.01); H01M 4/133 (2010.01); H01M 4/36 (2006.01); 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 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A negative electrode, comprising:
a negative electrode current collector;
a first active material layer disposed on the negative electrode current collector, the first active material layer comprising a first active material; and
a second active material layer disposed on a surface of the first active material layer away from the negative electrode current collector, the second active material layer comprising a second active material;
wherein the first active material and the second active material are independently oval-like particles with through holes and/or blind holes;
wherein the first active material has an average pore size from 70 to 140 nm, and the second active material has an average pore size from 10 to 30 nm;
wherein the first active material has an apparent density from 0.5 to 1.2 g/cm3, and the second active material has an apparent density from 1.5 to 2.0 g/cm3;
wherein an average short diameter to long diameter ratio of the particles of the first active material is 0.75, and an average short diameter to long diameter ratio of the particles of the second active material is 0.6; and
wherein the second active material and the first active material independently comprise one or more of soft carbon, hard carbon, artificial graphite, natural graphite, silicon, silicon oxides, silicon-carbon composites, lithium titanate, and metals capable of forming alloys with lithium.