US 12,394,782 B2
Silicon carbon negative electrode material, negative electrode sheet, secondary battery, battery module, battery pack and power consumption apparatus
Yingjie Guan, Ningde (CN); Yuzhen Zhao, Ningde (CN); Qingyan Ma, Ningde (CN); Yan Wen, Ningde (CN); Qisen Huang, Ningde (CN); and Fenggang Zhao, 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 Aug. 16, 2022, as Appl. No. 17/888,497.
Application 17/888,497 is a continuation of application No. PCT/CN2021/120755, filed on Sep. 26, 2021.
Prior Publication US 2023/0146274 A1, May 11, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01)
CPC H01M 4/364 (2013.01) [H01M 4/0471 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 4/622 (2013.01); C01P 2002/70 (2013.01); C01P 2002/74 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/16 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A silicon carbon negative electrode material, wherein,
a battery composed of a negative electrode prepared by the silicon carbon negative electrode material as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance is charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV is in a range of 3.5 to 15,
the silicon carbon negative electrode material has no pores or a number of pores with a diameter greater than 50 nm in a single silicon carbon negative electrode material particle is less than 10,
a content of the silicon is in a range of 2.5% to 10%, based on a total weight of the silicon carbon negative electrode material,
a median particle size Dv50 of the silicon carbon negative electrode material is in a range of 10 μm to 15 μm, and
a specific surface area of the silicon carbon negative electrode material is in a range of 1 m2 to 3 m2.