US 12,304,820 B2
Silicon carbon composite material and preparation method thereof, negative electrode material, negative electrode plate, electrode assembly, battery, electric equipment, and carbon substrate
Yuan Li, Ningde (CN); Xiaobin Dong, Ningde (CN); Zijian Lv, Ningde (CN); Liangbin Liu, Ningde (CN); and Jiazheng Wang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Fujian (CN)
Filed on Aug. 5, 2024, as Appl. No. 18/795,082.
Application 18/795,082 is a continuation of application No. PCT/CN2022/108327, filed on Jul. 27, 2022.
Prior Publication US 2024/0391779 A1, Nov. 28, 2024
Int. Cl. C01B 32/05 (2017.01)
CPC C01B 32/05 (2017.08) [C01P 2002/08 (2013.01); C01P 2004/03 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A silicon carbon composite material, comprising:
a carbon matrix having a cross-linked porous structure internally; and
a silicon material that is at least partially distributed in the cross-linked porous structure; and
wherein a value of flexibility C1 of the silicon carbon composite material satisfies 0.4≤C1≤2, the flexibility being measured by
applying a pressure of 2t to the silicon carbon composite material, holding the pressure for 10 s and releasing the pressure for 100 s, repeating until the pressure is held and released for 20 times, recording a compacted density P1 at the 1st pressure holding, a compacted density P2 at the 20th pressure holding, a compacted density P3 at the 1st pressure releasing, and a compacted density P4 at the 20th pressure releasing, and calculating C1=(P4−P3)/(P2−P1), wherein the carbon matrix comprises a first region and a second region in sequence along a direction extending from a center to a surface, and the carbon matrix is composed of the first region and the second region, wherein a volume of the second region is twice a volume of the first region.