Treatment process for a positive electrode active material for lithium-ion secondary battery
US9755223B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2014 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Mar 14, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a treatment process for a positive electrode active material for a lithium-ion secondary battery, Li compounds such as Li2CO3, LiOH, and the like, present in a positive electrode active material for a lithium-ion secondary battery but unsuitable for a positive electrode material, is removed. In a case wherein the resultant Li compound is used as a positive electrode material of the secondary battery, a discharge capacity and an average discharge voltage of the secondary battery do not decline, and gelation caused by a cleaning treatment is prevented. The positive electrode active material is cleaned with a cleaning fluid containing NH3, and then solid-liquid separation is performed, and a solid component is calcined at 600 to 700° C. in an oxygen atmosphere. The cleaning fluid has a conductivity of 11.6 mS/cm or less, and contains a recovered liquid component and may be repeatedly used as a cleaning fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.