Invention Grant
- Patent Title: Methods for controlling formation of multilayer carbon coatings on silicon-containing electroactive materials for lithium-ion batteries
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Application No.: US16668882Application Date: 2019-10-30
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Publication No.: US11843110B2Publication Date: 2023-12-12
- Inventor: Lei Wang , Xingcheng Xiao , Wei Li , Mark W. Verbrugge , Michael P. Balogh
- Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Applicant Address: US MI Detroit
- Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee Address: US MI Detroit
- Agency: Harness, Dickey & Pierce, P.L.C.
- Main IPC: H01M4/1395
- IPC: H01M4/1395 ; H01M4/38 ; H01M4/66 ; H01M4/04 ; H01M4/02

Abstract:
Methods of making negative electrode materials for an electrochemical cell that cycles lithium ions are provided. A surface of the electrode material formed of silicon, silicon-containing alloys, tin-containing alloys, or combinations thereof is treated with an oxidant at a first temperature of greater than or equal to about 100° C. to form a continuous intermediate layer comprising oxides. The method also includes pyrolyzing a carbon-containing precursor over the continuous intermediate layer at a second temperature of greater than or equal to about 600° C. to form a continuous carbon coating thereon. The intermediate layer oxides may be transformed to carbides. The continuous carbon coating comprises both graphitic carbon and amorphous carbon and may be a multilayered coating, where the inner layer predominantly includes amorphous carbon and the outer layer predominantly includes graphitic carbon.
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