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Citation: TANG Xin-cun, HUANG Bo-yun, HE Yue-hui. Dependence of Li⁺ Diffusion Coefficients in LiMn₂O₄ on Charge/Discharge Cycles[J]. Acta Physico-Chimica Sinica, ;2005, 21(09): 957-960. doi: 10.3866/PKU.WHXB20050903 shu

Dependence of Li⁺ Diffusion Coefficients in LiMn₂O₄ on Charge/Discharge Cycles

1.
College of Chemistry and Chemical Engineering, Central South University; State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083

Received Date: 22 December 2004
Available Online: 15 September 2005

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.
- Capacity intermittent titration technique;Solid diffusion coefficient;LiMn₂O₄;Lithium-ion batteries
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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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Dependence of Li⁺ Diffusion Coefficients in LiMn₂O₄ on Charge/Discharge Cycles