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Citation: QIU Xiang-Yun, ZHUANG Quan-Chao, WANG Hong-Ming, CUI Yong-Li, FANG Liang, SUN Shi-Gang. Influence of Electrolyte Composition on the Intercalation-Deintercalation Process of Lithium Ion in Spinel LiMn₂O₄[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1499-1506. doi: 10.3866/PKU.WHXB20100608 shu

Influence of Electrolyte Composition on the Intercalation-Deintercalation Process of Lithium Ion in Spinel LiMn₂O₄

1.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China; State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 29 October 2009
Available Online: 20 April 2010

Variations in the impedance spectra of the commercially available spinel LiMn2O4 electrode from -20 to 20 ℃ were investigated by electrochemical impedance spectroscopy (EIS) in 1 mol·L-1 LiPF6-EC (ethylene carbonate)|DEC (diethyl carbonate)|DMC (dimethyl carbonate), 1 mol·L-1 LiPF6-EC|DEC|EMC (ethyl methyl carbonate) and 1 mol·L -1 LiPF6-EC |DMC electrolyte solutions. We found that the impedance spectral characteristics of the spinel LiMn2O4 electrode was strongly influenced by temperature and only slightly influenced by the electrolyte composition. However, the electronic resistance and the resistance of the SEI filmas well as the charge transfer reaction resistance of the spinel LiMn2O4 electrode were strongly influenced by the electrolyte composition. In 1 mol·L-1 LiPF6-EC|DEC|DMC, 1 mol·L-1 LiPF6-EC|DEC|EMC and 1 mol·L-1 LiPF6-EC|DMC electrolyte solutions, the energy barriers for the ion jump relating to the migration of lithium ions through the solid electrolyte interphase (SEI) film of the spinel LiMn2O4 electrode were determined to be 7.60, 16.40, and 18.40 kJ·mol-1. The thermal active energies of the electronic conductivities were 44.77, 35.47, and 68.06 kJ·mol-1 and the intercalation-deintercalation reaction active energies were 52.19, 46.19, and 69.86 kJ·mol-1, respectively.
- Lithium-ion battery,
- Spinel LiMn2O4,
- Solid electrolyte interphase film,
- Electronic resistance,
- Charge transfer reaction resistance
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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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Influence of Electrolyte Composition on the Intercalation-Deintercalation Process of Lithium Ion in Spinel LiMn2O4

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Influence of Electrolyte Composition on the Intercalation-Deintercalation Process of Lithium Ion in Spinel LiMn₂O₄