公开(公告)号：US20230102190A1

公开(公告)日：2023-03-30

申请号：US17489260

申请日：2021-09-29

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC ,  BROWN UNIVERSITY

Inventor： Xingcheng XIAO ,  Mark VERBRUGGE ,  Mok Yun JIN ,  Brian W. SHELDON

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

Abstract: Methods for preparing a silicon-based electroactive material for use in an electrochemical cell are provided. The methods include heating a silicon oxide (SiOx, where 0.1≤x≤2) particle to a temperature between about 600° C. and about 1200° C. over a period between about 30 minutes and about 10 hours to form the silicon-based electroactive material, where the silicon-based electroactive material includes a silicon oxide matrix and a plurality of silicon crystallites embedded therein. In certain instances, the heating may occur in an inert atmosphere such that the silicon crystallites are distributed throughout the silicon oxide matrix. In other instances, the heating may occur in a reducing environment such that the silicon crystallites are condensed in one or more regions in the silicon oxide matrix. In each instance, the silicon-based electroactive material may be carbon coated by heating the silicon-based electroactive material in an environment including hydrocarbons.

公开(公告)号：US20230064146A1

公开(公告)日：2023-03-02

申请号：US17412895

申请日：2021-08-26

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Shuru CHEN ,  Meinan HE ,  Fang DAI ,  Mark VERBRUGGE ,  Mei CAI

IPC: H01M10/0569 ,  H01M4/505 ,  H01M4/525 ,  H01M4/38 ,  H01M4/58

Abstract: The present disclosure provides an electrolyte system for an electrochemical cell that cycles lithium ions. The electrolyte system may include an aliphatic fluorinated disulfonimide lithium salt in a mixture of organic solvents. The mixture of organic solvents may include a first solvent and a second solvent. The first solvent may include an ether solvent, a carbonate solvent, or a mixture of ether and carbonate solvents. The second solvent may include a fluorinated ether. A molar ratio of the aliphatic fluorinated disulfonimide lithium salt to the first solvent may be greater than or equal to about 1:1.2 to less than or equal to about 1:2. A molar ratio of the first solvent to the second solvent may be greater than or equal to about 1:1 to less than or equal to about 1:4.