公开(公告)号：EP4160747A1

公开(公告)日：2023-04-05

申请号：EP21909093.3

申请日：2021-12-02

申请人： Shanghai Ruipu Energy Co., Ltd. ,  REPT BATTERO Energy Co., Ltd.

发明人： CAO, Hui ,  SUN, Yuwei ,  HOU, Min ,  LIU, Chan ,  WANG, Jinzuan ,  YU, Zhaoyu

IPC分类号： H01M4/62 ,  H01M4/38 ,  H01M4/134 ,  H01M10/0525 ,  B82Y30/00

摘要： Preparation of a silicon composite material, and a negative electrode plate containing same, relating to the field of silicon-based composite materials. The silicon composite material comprises silicon nanoparticles (1), carbon nanotubes (2), silicon oxide, lithium oxide, and lithium metasilicate; the carbon nanotubes (2) and the silicon nanoparticles (1) are dispersed and cross-linked to form a three-dimensional network structure; silicon oxide, lithium oxide, and lithium metasilicate cover the three-dimensional network structure to form secondary particles. The secondary particles and graphite are homogenized and coated according to a specific particle size ratio to prepare the negative electrode plate containing the silicon composite material and having high capacity development, good conductivity, high coulombic efficiency, small volume expansion, and high cycling stability.