Method for modification of lithium ion battery positive electrode material
US9440861B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2014 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Nov 19, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a method for modification of a lithium ion battery positive electrode material. The method comprises the following steps: (1) mixing organic acid and alcohol to obtain an organic solution; (2) adding positive electrode material into the organic solution to obtain a suspension; (3) washing with alcohol solvent after centrifugal separation; (4) drying treatment; the positive electrode material is a nickel-based metal oxide positive electrode material LiNixM1-xO2, wherein 0.5≦x<1 and M is one or two selected from the group consisting of Co, Mn, Al, Cr, Mg, Cu, Ti, Mg, Zn, Zr and V. Compared with the prior art, the method of the present invention utilizes the mixed solution of alcohol and organic acid to wash the positive electrode material thereby soluble Li salt impurities on the surface of the positive electrode material are removed and pH value of the material are significantly decreased; meanwhile, low-temperature drying treatment makes the washed material to be coated with alcohol molecules which can block air molecules, thereby the binding of water molecules and the positive electrode material are avoided and pole piece gumming are prevented, obvi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.