Electrochemically active material for the positive electrode of an electrochemically rechargeable lithium cell
US7285357B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2004 |
| Grant date | Oct 23, 2007 |
| Priority date | — |
| Expiry date | Dec 4, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrochemically active material resulting from substituting a portion of the nickel in a single-phase composite oxide of nickel and lithium of the LiNiO2 type, characterized in that the active material satisfies the formula:Li(M1(1-a-b-c)LiaM2bM3c)O2in which: 0.02<a≦0.25; 0≦b<0.30; 0≦c<0.30; (a+b+c)<0.50; M3 is at least one element selected from Al, B, and Ga; M2 is at least one element selected from Mg and Zn; andM1=Ni(1-x-y-z)CoxMnyM4zin which M4 is at least one element selected from Fe, Cu, Ti, Zr, V, Ga, and Si; and 0≦x<0.70; 0.10≦y<0.55; 0≦z<0.30; and 0.20<(1-x-y-z); b+c+z>0; and in that said active material, regardless of its state of charge, satisfies the relationship:0.40<R<0.90, where:R=(1-a-b-c)*[3-[(nU/nMA+dox)/(4-2b-3c)]*(2-b-2c)]in which: nU is the lithium content expressed in moles; nMA is the sum of the contents of Ni, Mn, Co, and M4 expressed in moles; and dox is the overall degree of oxidation of M1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.