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Effect of sulfolane and lithium bis(oxalato)borate-based electrolytes on the performance of spinel LiMn2O4 cathodes at 55 °C

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Abstract

To seek a promising candidate electrolyte at elevated temperature for lithium manganese oxide (LiMn2O4)/Li cells, the electrochemical performance of 0.7 mol L−1 LiBOB (lithium bis(oxalate)borate)-SL (sulfolane)/DEC (diethyl carbonate) (1:1, in volume) electrolyte was studied at 55 °C. The Mn dissolution in electrolyte was analyzed by inductively coupled plasma (ICP) analysis. AC impedance measurement and scanning electron microscopy (SEM) analysis were used to analyze the formation of the surface film on the LiMn2O4 electrode. The results demonstrate that the LiBOB-SL/DEC electrolyte can slow down the dissolution and erosion of Mn ions, and decrease the interface impedance. Moreover, the LiBOB-SL/DEC electrolyte could obviously improve the capacity retention, the operating voltage (4.05 V), and the rate performance of LiMn2O4/Li cells.

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Acknowledgments

This work was supported by the Natural Science Foundation of China (no. 21406100 and no. 21566021), and the Special Fund of Gansu Province for the Transformation of Scientific and Technological Achievements for Young Talents (no. 01).

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Authors and Affiliations

  1. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China

    Shiyou Li, Yuzhou Xue, Xiaoling Cui, Shan Geng & Yuanzheng Huang

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  1. Shiyou Li
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  2. Yuzhou Xue
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  3. Xiaoling Cui
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  4. Shan Geng
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  5. Yuanzheng Huang
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Correspondence to Xiaoling Cui.

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Li, S., Xue, Y., Cui, X. et al. Effect of sulfolane and lithium bis(oxalato)borate-based electrolytes on the performance of spinel LiMn2O4 cathodes at 55 °C. Ionics 22, 797–801 (2016). https://doi.org/10.1007/s11581-015-1611-z

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