Olivine composition with improved cell performance
US10147945B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 8, 2013 |
| Grant date | Dec 4, 2018 |
| Priority date | — |
| Expiry date | Apr 21, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention discloses an olivine cathode material comprising Li, M and PO 4, having a non-stoichiometric composition wherein: —the phosphor stoichiometry PO 4:[(Li+M)/2] is between 0.940 and 1.020, —the lithium to metal ratio Li:M is between 1.040 and 1.150, and wherein M=Fe−x−z′ Mn x D z′, with 0.10<x<0.90, z′>0, D being a dopant comprising either one or both of Cr and Mg. In one embodiment PO 4:[(Li+M)/2] is between 0.960 and 1.000, resulting in an even better performing material. Performance is improved even more in another embodiment wherein PO 4:[(Li+M)/2] is less than 1.000. Improvements in performance are also obtained for either an embodiment wherein the lithium to metal ratio Li:M is between 1.070 and 1.120; or an embodiment wherein the manganese to iron ratio Mn/(Mn+Fe) is between 0.25 and 0.75; or for another embodiment wherein z′<0.05.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.