Negative electrode material powder for lithium ion secondary battery, negative electrode for lithium ion secondary battery, negative electrode for capacitor, lithium ion secondary battery, and capacitor
US8900749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2011 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | Jul 26, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A negative electrode material powder for a lithium ion secondary battery having a conductive carbon film on the surface of a lower-silicon-oxide powder; wherein a specific surface area in BET measurement ranges from more than 0.3 m2/g to 40 m2/g, and no SiC peak appears at 2θ=35.6°±0.01° or the half-value width of the appeared peak is 2° or more in XRD measurement using CuKα rays. The proportion of said carbon film preferably ranges from 0.2% to 2.5% by mass. Said powder preferably has 100000 Ωcm or less of specific resistance. In XRD, P2/P1<0.01 is preferably satisfied between the highest value P1 of halo of SiOx and a value P2 of the strongest linear peak of Si (111) above the halo.Accordingly, said powder can be used in the secondary battery with a large discharge capacity and a preferable cycle characteristics for practical use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.