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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (07): 725-729    DOI: 10.3866/PKU.WHXB20050706
Article     
The Effect of Ti4+, Mg2+ Co-doping on Performance of LiNi0.4Co0.2Mn0.4O2
HUANG You-yuan; ZHOU Heng-hui; CHEN Ji-tao; GAO De-shu; SU Guang-yao
College of Chemistry, Xiangtan University, Xiangtan 411105; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
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Abstract  The effect of co-doping with Ti and Mg ions in LiNi0.4Co0.2Mn0.4O2 on structure and electrochemical performance was investigated by using SEM, XRD, EIS and galvanostatic charge-discharge experiment. The XRD showed that some characteristic peak intensity ratios have significant change. The rate discharge capability and cycle stability of LiNi0.4Co0.2Mn0.4O2 can be improved significantly by a small amount of Ti, Mg ions co-doping (1% molar ratio). AC impedance was used to study the processes of charge-discharge cycle. The result showed that (Ti4+, Mg2+) multiple-ion dopant can evidently suppress the increasing of the electrochemical reaction resistant Rct at 1C & 2C discharge rates. Co-doping of metal ions with diferent valences is a useful method to improve large current discharge capability of the lithium insertion nickel cobalt manganese oxides.

Key wordsLiNi0.4Co0.2Mn0.4O2      Layeredstructure      (Ti4+, Mg2+) multiple-ion dopant      Rate-capability      Lithium ion battery     
Received: 17 November 2004      Published: 15 July 2005
Corresponding Authors: GAO De-shu     E-mail: sugy@xtu.edu.cn
Cite this article:

HUANG You-yuan; ZHOU Heng-hui; CHEN Ji-tao; GAO De-shu; SU Guang-yao. The Effect of Ti4+, Mg2+ Co-doping on Performance of LiNi0.4Co0.2Mn0.4O2. Acta Physico-Chimica Sinica, 2005, 21(07): 725-729.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20050706     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I07/725

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