公开(公告)号：US20220376228A1

公开(公告)日：2022-11-24

申请号：US17771734

申请日：2021-05-21

Applicant: BTR NEW MATERIAL GROUP CO., LTD. ,  DINGYUAN NEW ENERGY TECHNOLOGY CO., LTD.

Inventor： Lijuan Qu ,  Zhiqiang Deng ,  Chunlei Pang ,  Jianguo Ren ,  Xueqin He

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/48 ,  H01M4/58 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/1395 ,  H01M4/134 ,  H01M4/1397 ,  H01M4/136 ,  H01M4/04

Abstract: The present application provides a silicon-oxygen composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon-oxygen composite negative electrode material has a core-shell structure, the core comprises nano-silicon and a silicon oxide SiOx, and the shell comprises Li2SiO3. The preparation method comprises: mixing a silicon source and a lithium source, and performing heat treatment in a non-oxygen atmosphere to obtain a composite material containing Li2SiO3; and immersing the composite material containing Li2SiO3 in an acid solution to obtain the silicon-oxygen composite negative electrode material. The nano-silicon in the negative electrode material provided by the present application is wrapped by SiOx, and the surface of SiOx is further wrapped with the Li2SiO3 having a stable structure, making it difficult for the nano-silicon to come into physical contact with substances other than the SiOx and impossible to come into direct contact with water, thereby effectively inhibiting gas production of a battery.

公开(公告)号：US12183919B2

公开(公告)日：2024-12-31

申请号：US17420570

申请日：2020-10-28

Applicant: BTR NEW MATERIAL GROUP CO., LTD.

Inventor： Chunlei Pang ,  Lijuan Qu ,  Zhiqiang Deng ,  Jianguo Ren ,  Xueqin He

IPC: H01M4/48 ,  H01M4/04 ,  H01M4/36 ,  H01M4/02

Abstract: The present application provides a silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery. The silicon-oxygen composite negative electrode material comprises a silicon-oxygen composite negative electrode material comprising SiOx, non-Li2Si2O5 lithium-containing compound, and Li2Si2O5; said Li2Si2O5 is coated on the surface of the non-Li2Si2O5 lithium-containing compound; 0≤x≤1.2. The preparation method comprises: mixing a first silicon source with a reducing lithium source and roasting, to obtain a composite material containing a non-Li2Si2O5 lithium-containing compound; the composite material containing the non-Li2Si2O5 lithium-containing compound is fused with a second silicon source and then subjected to heat treatment to obtain a silicon-oxygen composite negative electrode material. The silicon-oxygen composite anode material provided by the present application is coated with Li2Si2O5, solving the problem in the prior art of a negative electrode material producing strong alkaline or easily soluble by-products in water after pre-lithiation and affecting subsequent processing.

公开(公告)号：US12166210B2

公开(公告)日：2024-12-10

申请号：US17042640

申请日：2019-08-01

Applicant: BTR New Material Group Co., Ltd.

Inventor： Lijuan Qu ,  Chunlei Pang ,  Jianguo Ren ,  Youyuan Huang ,  Min Yue

IPC: H01M4/58 ,  H01M4/04 ,  H01M10/0525 ,  H01M4/02

Abstract: Provided is a negative electrode material of a lithium ion secondary battery. The negative electrode material includes a carbon coating layer and a core layer. The core layer includes lithium polysilicate and silicon oxide, and silicon is uniformly embedded in the lithium polysilicate and/or in the silicon oxide. The negative electrode material has high first coulomb efficiency, long cycle performance, excellent rate performance and high safety.

公开(公告)号：US11929484B2

公开(公告)日：2024-03-12

申请号：US16476471

申请日：2018-02-27

Applicant: BTR NEW MATERIAL GROUP CO., LTD.

Inventor： Chunlei Pang ,  Lijuan Qu ,  Jianguo Ren ,  Min Yue

IPC: C01B33/025 ,  C01B33/12 ,  H01M4/131 ,  H01M4/36 ,  H01M4/38 ,  H01M4/48 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/131 ,  C01B33/025 ,  C01B33/12 ,  H01M4/364 ,  H01M4/366 ,  H01M4/386 ,  H01M4/483 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0525 ,  C01P2004/03 ,  C01P2004/80 ,  C01P2006/12 ,  C01P2006/40 ,  H01M2004/027

Abstract: Disclosed in the present application is a compound, comprising nano silicon, a lithium-containing compound and a carbon coating, or comprising nano silicon, silicon oxide, a lithium-containing compound, and a carbon coating. The method comprises: (1) solid-phase mixing of carbon coated silicon oxide with a lithium source; and (2) preforming heat-treatment of the pre-lithium precursor obtained in step (1) in a vacuum or non-oxidising atmosphere to obtain a compound. The method is simple, and has low equipment requirements and low costs; the obtained compound has a stable structure and the structure and properties do not deteriorate during long-term storage, a battery made of cathode material containing said compound exhibits high delithiation capacity, high initial coulombic efficiency, and good recycling properties, the charging capacity is over 1920 mAh/g, the discharging capacity is over 1768 mAh/g, and the initial capacity is over 90.2%.