Lithium ion secondary battery
US8846249B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2006 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Jan 9, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The positive electrode of a lithium ion secondary battery includes active material particles represented by LixNi1−yMyMezO2+δ, and the active material particles include a lithium composite oxide represented by LixNi1−yMyO2, (where 0.95≦x≦1.1, 0<y≦0.75, 0.001≦z≦0.05). The element M is selected from the group consisting of alkaline-earth elements, transition elements, rare-earth elements, IIIb group elements and IVb group elements. The element Me is selected from the group consisting of Mn, W. Nb, Ta, In, Mo, Zr and Sn, and the element Me is included in a surface portion of the active material particles. The lithium content x in the lithium composite oxide in an end-of-discharge state when a constant current discharge is performed at a temperature of 25° C. with a current value of 1C and an end-of-discharge voltage of 2.5 V satisfies 0.85≦x≦−0.013Ln(z)+0.871.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.