Powder for negative electrode of lithium ion secondary battery, and method for producing such powder
US10236531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2015 |
| Grant date | Mar 19, 2019 |
| Priority date | — |
| Expiry date | Dec 7, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention provides a powder for a negative electrode of a lithium ion secondary battery, which is a powder that includes a silicon oxide powder containing Li. When a molar ratio between Li, Si and O is taken as y:1:x, the average composition of the powder overall satisfies the relation 0.5<x<1.5 and the relation 0.1<y/x<0.8. The volume median diameter of the powder for a negative electrode is within a range from 0.5 to 30 μm. When X-ray diffraction measurement of the powder is performed using a Cu Kα ray, a relation P2/P1≤1.0 and a relation P3/P1≤1.0 are satisfied, where P1 represents a height of a peak attributed to Li2SiO3, P2 represents a height of a peak attributed to crystalline Si, and P3 represents a height of a peak attributed to Li4SiO4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.