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Citation: 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 LiNi_0.4Co_0.2Mn_0.4O₂[J]. Acta Physico-Chimica Sinica, ;2005, 21(07): 725-729. doi: 10.3866/PKU.WHXB20050706 shu

The Effect of Ti⁴⁺, Mg²⁺ Co-doping on Performance of LiNi_0.4Co_0.2Mn_0.4O₂

1.
College of Chemistry, Xiangtan University, Xiangtan 411105； College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

Received Date: 17 November 2004
Available Online: 15 July 2005

The effect of co-doping with Ti and Mg ions in LiNi_0.4Co_0.2Mn_0.4O₂ 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 LiNi_0.4Co_0.2Mn_0.4O₂ 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.
- LiNi_0.4Co_0.2Mn_0.4O₂;Layeredstructure;(Ti⁴⁺, Mg²⁺) multiple-ion dopant;Rate-capability;Lithium ion battery
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沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

The Effect of Ti⁴⁺, Mg²⁺ Co-doping on Performance of LiNi_0.4Co_0.2Mn_0.4O₂