Positive electrode active substance for lithium ion batteries, positive electrode for lithium ion batteries, and lithium ion battery
US9225020B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2011 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Mar 2, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a positive electrode active material for a lithium ion battery which has high capacity and good rate characteristics. The positive electrode active material has a layer structure represented by the compositional formula: Liα(NiβMe1-β)Oγ, wherein Me represents at least one type selected from the group consisting of Mn, Co, Al, Mg, Cr, Ti, Fe, Nb, Cu and Zr, x denotes a number from 0.9 to 1.2, y denotes a number from 0.5 to 0.65, and z denotes a number of 1.9 or more. The positive electrode active material is selected by measuring the coordinates of the lattice constant a and compositional ratio (Li/M) and selecting materials within the region enclosed by three lines given by the equations: y=−20.186x+59.079, y=35x−99.393, and y=−32.946x+95.78, wherein the x-axis represents a lattice constant a and the y-axis represents a compositional ratio (Li/M) of Li to M.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.