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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (08): 934-938    DOI: 10.3866/PKU.WHXB20050822
Note     
The Anion-cation Multiple Doping Effect of Spinel Cathode Materials on Electrochemical Speciality
TANG Zhi-yuan; LU Xing-he; ZHANG Na
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072; 2Hebei University of Engineering, Handan 056038
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Abstract  Li1.02CraCobLacMn2abcFyO4-y (a,b,c=0, 0.01, 0.02; y=0, 0.02) doped with several ions (anion-cation) was prepared by solid-state reaction method. X-ray diffraction showed that all the samples had perfect spinel strucure. The results of the charge/discharge curves showed that multiple doping spinel Li1.02Cr0.01Co0.02La0.01Mn1.96F0.02O3.98 had better performance than those undoped or cation-doped materials according to the inhibition of decline of reversible capacity of spinel at 25 ℃. Besides that, the multiple doping spinel also had ideal discharge capacity. And the cycle performance(120.1~113.5 mAh•g-1) was improved so obviously that 94.5% of the initial capacity was preserved after 80 cycles. Meanwhile, the elevated temperature(55 ℃) perforance of the material was improved. With the spinel Li1.02CraCobLacMn2abcFyO4-y as working electrode, Li as counter electrode and reference electrode, electro-chemical impedance tests showed that this material possessed good charge/discharge reversible capability and had the lowest impedance on the stage of charge/discharge.

Key wordsLithium-ion batteries      Spinel      Anion-cation doping      Cathode material      Electrochemical performance     
Received: 13 December 2004      Published: 15 August 2005
Corresponding Authors: TANG Zhi-yuan     E-mail: zytang@tju.edu.cn
Cite this article:

TANG Zhi-yuan; LU Xing-he; ZHANG Na. The Anion-cation Multiple Doping Effect of Spinel Cathode Materials on Electrochemical Speciality. Acta Physico-Chimica Sinica, 2005, 21(08): 934-938.

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http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20050822     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I08/934

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