Positive active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery comprising same
US6893776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2001 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Feb 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A positive active material for a non-aqueous electrolyte secondary battery includes a lithium-nickel composite oxide represented by the compositional formula LiaNi1−b−cCObMncO2 (a≦1.09, 0.05≦b≦0.35, 0.15≦c≦0.35, and 0.25≦b+c≦0.55). By X-ray diffractometry with a CuKα ray, the lithium-nickel composite oxide exhibits an intensity ratio R ((I012+I006)/I101) of not greater than 0.50, wherein R is the ratio of the sum of the diffraction peak intensity I012 on the 012 plane and the diffraction peak intensity I006 on the 006 plane to the diffraction peak intensity I101 on the 101 plane. The crystallinity of the positive active material of the compositional formula LiaNi1−b−cCobMncO2 can be kept high and it is possible to secure good capacity density and cycle life performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.