Lithium-ion secondary battery and method of producing the same
US11011753B2 · kind B2 · utility
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Key dates
| Filing date | Feb 21, 2019 |
| Grant date | May 18, 2021 |
| Priority date | — |
| Expiry date | Jun 30, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes at least a negative electrode active material and a polymer binder. The negative electrode active material includes at least a graphitic material and a silicon oxide material. The amount of acidic functional groups per unit surface area of graphitic material is not lower than 0.017 mmol/m2 and not higher than 0.086 mmol/m2. A polymer binder contains a carboxy group. Polymer binder has a main chain with a length not smaller than 0.53 μm and not greater than 2.13 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.