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Acta Physico-Chimica Sinica  2008, Vol. 24 Issue (07): 1175-1179    DOI: 10.3866/PKU.WHXB20080710
Article     
Electrochemical Characteristics of Y2O3-Coated LiCo1/3Ni1/3Mn1/3O2
WANG Meng; WU Feng; SU Yue-Feng; CHEN Shi
National Development Center of High Technology Green Materials, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, P. R. China
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Abstract  LiCo1/3Ni1/3Mn1/3O2 was coated by a layer of Y2O3 via a simple method. The bared sample was immersed into Y(NO3)3·6H2O solution and then calcined at a certain temperature to get the coated material. The coated and bared LiCo1/3Ni1/3Mn1/3O2 meterials were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), cyclic voltammetry (CV), and galvanotactic charge-discharge test. It was showed that Y2O3 existed only on the surface, and had no effect on the crystal structure; the LiCo1/3Ni1/3Mn1/3O2 coated with Y2O3 exhibited better capacity retention than the bared LiCo1/3Ni1/3Mn1/3O2 in the higher cutoff voltage and had higher thermal stability. CV results suggested that the Y2O3 coating suppressed the phase transitions and prevented the surface of cathode materials fromdirect contact with the electrolyte.

Key wordsLiCo1/3Ni1/3Mn1/3O2      Y2O3      Coating      Lithium-ion battery     
Received: 28 January 2008      Published: 09 May 2008
MSC2000:  O646  
Corresponding Authors: WU Feng     E-mail: wufeng863@bit.edu.cn
Cite this article:

WANG Meng; WU Feng; SU Yue-Feng; CHEN Shi. Electrochemical Characteristics of Y2O3-Coated LiCo1/3Ni1/3Mn1/3O2. Acta Physico-Chimica Sinica, 2008, 24(07): 1175-1179.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20080710     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2008/V24/I07/1175

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