Active material for nonaqueous electrolyte secondary battery, method for manufacturing active material, electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
US9219275B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2012 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Dec 5, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An active material for a nonaqueous electrolyte secondary battery includes a lithium transition metal composite oxide which has an α-NaFeO2-type crystal structure, is represented by the compositional formula Li1+αMe1−αO2 (Me is a transition metal element containing Mn, Ni and Co; and 0<α<1) and satisfies the requirement of 1.250 ≦(1+α)/(1−α)≦1.425. The half-width of a diffraction peak at 2θ=18.6°±1° is 0.20° to 0.27° and/or the half-width of a diffraction peak at 2θ=44.1°±1° is 0.26° to 0.39° in X-ray diffraction measurement using a CuKα radiation. The lithium transition metal composite oxide is observed as a single phase indexed a hexagonal crystal (space group R3-m) on the X-ray diffraction patterns when electrochemically oxidized to a potential of 5.0 V (vs. Li/Li+).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.