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Effect of Co3(PO4)2 coating on Li[Co0.1Ni0.15Li0.2Mn0.55]O2 cathode material for lithium rechargeable batteries
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- Authors
- Sang Hyo Lee, Bon Keup Koo, Jin-Chul Kim, Kwang Man Kim
- Issue Date
- 2008-09
- Citation
- Journal of Power Sources, v.184, no.1, pp.276-283
- ISSN
- 0378-7753
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- To prepare a high-capacity cathode material with improved electrochemical performance for lithium rechargeable batteries, Co3(PO4)2 nanoparticles are coated on the surface of powdered Li[Co0.1Ni0.15Li0.2Mn0.55] O2, which is synthesized by a simple combustion method. The coated powder prepared under proper conditions for Co3(PO4)2 content and annealing temperature shows an optimum coating layer that consists of a LixCoPO4 phase formed by reaction with lithium impurities during heat treatment. A sample coated with 3 wt.% Co3(PO4)2 and annealed at 800 °C proves to be the best in terms of specific capacity, cycle performance and rate capability. Thermal stability is also enhanced by the coating, as demonstrated a decrease in the onset temperature and/or the heat generated during thermal runaway. © 2008 Elsevier B.V. All rights reserved.
- KSP Keywords
- Annealing temperature, Cathode materials, Coated powders, Cycle performance, Effect of CO, High-capacity cathode, Onset temperature, Rate Capability, Thermal runaway, Thermal stability(TGA), coating layer