公开(公告)号：US20200381715A1

公开(公告)日：2020-12-03

申请号：US16998256

申请日：2020-08-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Hang SU ,  Yangxing LI ,  Zhexun YU ,  Pinghua WANG

IPC: H01M4/36 ,  H01M4/62 ,  H01M4/38 ,  H01M10/0525 ,  C23C16/26

Abstract: A composite material and a preparation method thereof are provided to solve the prior-art problem that a silicon anode material used in a battery is prone to cracking and pulverization. The composite material includes a layered silicon core and a plurality of carbon nanotubes. The layered silicon core includes a plurality of silicon-based material layers, and there is an interlayer spacing between two adjacent silicon-based material layers. Each silicon-based material layer has at least one through hole, and the silicon-based material layer includes silicon or silicon oxide. Each of the plurality of carbon nanotubes passes through the through holes on the plurality of silicon-based material layers.

公开(公告)号：US20230231115A1

公开(公告)日：2023-07-20

申请号：US18189268

申请日：2023-03-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Hang SU ,  Yujing SHA ,  Shengan XIA ,  Fengchao XIE

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/58 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/366 ,  H01M4/386 ,  H01M4/0471 ,  H01M4/5825 ,  H01M10/0525 ,  H01M2004/021

Abstract: In fields related to battery cathode material technologies, a nano-silicon composite material and a preparation method thereof, an electrode material, and a battery are provided to resolve large volume expansion of a cathode material of a battery and a serious side reaction with an electrolyte. The nano-silicon composite material includes a core, a first coating layer, and a second coating layer. The core includes a nano-silicon crystal. The first coating layer covers a surface of the core. The first coating layer is of a porous structure. A material of the first coating layer includes bisilicate and silicon oxide in a deoxidized state. The second coating layer covers a surface of the first coating layer. A material of the second coating layer includes silicon dioxide in a deoxidized state.