Ni-, Co-, and Mn- multi-element doped positive electrode material for lithium battery and its preparation method
US8709301B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2009 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | Aug 10, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A Ni—, Co—, and Mn— multi-element doped positive electrode material for lithium ion batteries and its preparation method are provided. The method for preparing said material consists of: first forming a Ni—, Co—, and Mn— multi-element doped intermediate compound by coprecipitation or chemical synthesis; mixing said multi-element intermediate compound with lithium salt and pre-processing the resulting mixture; adding polyvinyl alcohol into the mixture and mixing uniformly, then pressing the resulting mixture into blocks, and calcining these at 800˜930° C.; cooling outside the furnace, crushing and passing through a 400-mesh sieve; calcining the resulting powder at 700˜800° C., cooling outside the furnace and crushing to obtain the product. The positive electrode material obtained by the method described is in the form of non-agglomerated monocrystal particles, with a particle diameter of 0 5˜30 μm, the chemical formula LiNixCoyMnzM(1-x-y-z)O2, a compacted density of up to 3.4 g/cm3, and an initial discharge capacity of 145˜152 mAh/g. This positive electrode material shows excellent cycle performance and a high degree of safety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.