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Preparation and electrochemical performance of ball-like LiMn0.4Ni0.4Co0.2O2 cathode materials
- Source :
-
Electrochimica Acta . Aug2012, Vol. 77, p39-46. 8p. - Publication Year :
- 2012
-
Abstract
- Abstract: Ball-like LiMn0.4Ni0.4Co0.2O2 particles composed of flakes were synthesized by a simplified co-precipitation method followed by a solid-state reaction at temperatures of 600–900°C. The relationship between the flake thickness and the electrochemical performance of the layered oxides was investigated in this work. The layered oxide with a flake thickness of 80–100nm synthesized at 800°C has the best electrochemical performance among these cathode materials, especially the rate capability. An initial discharge capacity of 160mAhg−1 was obtained at 5C (1400mAg−1) in the voltage range of 2.5–4.5V, and the capacity retention was 80% after 50 cycles. The excellent rate capability is attributed to the well formed structure, short diffusion distance and good crystallinity. In addition, a detailed study of diffusion coefficient of Li+ was carried out to further understand this material. The value of calculated is in the range of 10−11 to 10−12 cm2 s−1. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 77
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 77768414
- Full Text :
- https://doi.org/10.1016/j.electacta.2012.05.110