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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (09): 957-960    DOI: 10.3866/PKU.WHXB20050903
Article     
Dependence of Li+ Diffusion Coefficients in LiMn2O4 on Charge/Discharge Cycles
TANG Xin-cun; HUANG Bo-yun; HE Yue-hui
College of Chemistry and Chemical Engineering, Central South University; State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083
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Abstract  The solid diffusion coefficient of lithium-ion in spinel LiMn2O4 cathode material has been investigated by the capacity intermittent titration technique (CITT) at different voltages and at different charge/discharge cycles. Results show that there are two minimum peaks in the curves of the solid diffusion coefficient (D) vs voltage (E) at 3.95 V and 4.12 V in the voltage range from 3.85 V to 4.30 V. The curves of lgD-E for the first 20 cycles show that the two minimum peaks are gradually flatted out and the values of solid diffusion coefficient tend to increase when the cycling number increases. The results suggest that LiMn2O4 cathode material has the ability of self-diffusion-enhance during intercalation/deintercalation of lithium-ion.

Key wordsCapacity intermittent titration technique      Solid diffusion coefficient      LiMn2O4      Lithium-ion batteries     
Received: 22 December 2004      Published: 15 September 2005
Corresponding Authors: TANG Xin-cun     E-mail: tangxc@csu.edu.cn
Cite this article:

TANG Xin-cun; HUANG Bo-yun; HE Yue-hui. Dependence of Li+ Diffusion Coefficients in LiMn2O4 on Charge/Discharge Cycles. Acta Physico-Chimica Sinica, 2005, 21(09): 957-960.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20050903     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I09/957

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