公开(公告)号：EP4092785A1

公开(公告)日：2022-11-23

申请号：EP21740650.3

申请日：2021-01-15

申请人： Tianjin University

发明人： YANG, Quanhong ,  CHEN, Fanqi ,  HAN, Junwei ,  XIAO, Jing ,  KONG, Debin ,  TAO, Ying

IPC分类号： H01M4/36 ,  H01M4/38

摘要： Disclosed is a method for preparing a micron silicon-carbon composite negative electrode material, the method comprising the following steps: subjecting micron silicon particles to a chemical vapor deposition reaction to obtain carbon-coated first micron silicon particles; dispersing the carbon-coated first micron silicon particles in a first mixed solvent to obtain a dispersion; adding an alkali to the dispersion and then heating same to obtain carbon-coated second micron silicon particles; dispersing the carbon-coated second micron silicon particles and graphene oxide into a second mixed solvent, and performing a hydrothermal reaction to obtain a hydrogel; and heating the hydrogel to obtain the micron silicon-carbon composite negative electrode material. The micron silicon-carbon composite negative electrode material prepared by means of the method can not only efficiently buffer the swelling of internal micron-scale silicon particles, but can also withstand the pressure during an external compaction process. Disclosed are a micron silicon-carbon composite negative electrode material prepared by means of the method, a negative electrode plate, and a lithium ion battery.