Impedance Studies of Spinel LiMn2O4 Electrode/electrolyte Interfaces |
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| Authors: | ZHUANG Quan-chao FAN Xiao-yong XU Jin-mei WEI Guo-zhen DONG Quan-feng SUN Shi-gang |
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| Institution: | a School of Materials Science and Engineering, China University of Mining &; Technology, Xuzhou 221116, P. R. China;
b State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, P. R. China |
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| Abstract: | The formation process of solid electrolyte interphase(SEl) film on spinel LiMn2O4 electrode surface was studied by electrochemical impedance spectroscopy(EIS) during the initial storage in 1 mol/L LiPF6-EC:DMC:DECelectrolyte and in the subsequent first charge-discharge cycle,It has been demonstrated that the SEI film thickness increased with the increase of storage time and spontaneous reactions occurring between spinel LiMn2O4 electrode and electrolyte can be prevented by the SEI film,In the first charge-discharge cycle succeeding the storage,the electrolyte oxidation coupled with Li-ion insertion is evidenced as the main origin to increase the resistance of SEI film,The results also confirm that the variations of the charge transfer resistance(Rct) with the electrode potential(E) can be well described using a classical equation. |
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| Keywords: | Li-ion batteries SEI film Electrochemical impedance spectroscopy Spinel LiMn2O4 |
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