Methods for controlling formation of multilayer carbon coatings on silicon-containing electroactive materials for lithium-ion batteries
US11843110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2019 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Nov 7, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.