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A piperidinium-based ester-functionalized ionic liquid as electrolytes in Li/LiFePO4 batteries

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Abstract

A new functionalized ionic liquid (IL) based on cyclic quaternary ammonium cations with ester group and bis(trifluoromethanesulfonyl)imide ([TFSI]) anion, namely, N-methyl-N-methoxycarbonylpiperidinium bis(trifluoromethanesulfonyl)imide ([MMOCPip][TFSI]), was synthesized and characterized. Physical and electrochemical properties, including Li-ion transference number, ionic conductivity, and electrochemical stability, were investigated. The electrochemical window of [MMOCPip][TFSI] was 6 V, which was wide enough to be used as a common electrolyte material. The Li-ion transference number of this IL electrolyte containing 0.1 M LiTFSI was 0.56. The half-cell tests indicated that the [MMOCPip][TFSI] obviously improved the cyclability of a Li/LiFePO4 cell. For the Li/LiFePO4 half-cells, after 20 cycles at room temperature at 0.1 C, the discharge capacity was 109.7 mAh g−1 with 98.7% capacity retention in the [MMOCPip][TFSI]/0.1 M LiTFSI electrolyte. The good electrochemical performance demonstrated that the [MMOCPip][TFSI] could be used as electrolyte for lithium-ion batteries.

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Acknowledgements

This work is supported by the Project of National Nature Science Foundation of China (No. 21276057) and the Natural Science Foundation of Heilongjiang Province of China (No. B201007). The authors thank Prof. Giovanni Zangari (University of Virginia) for revising the English grammar in the manuscript.

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Correspondence to P. X. Yang.

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Pan, X.N., Hou, J., Liu, L. et al. A piperidinium-based ester-functionalized ionic liquid as electrolytes in Li/LiFePO4 batteries. Ionics 23, 3151–3161 (2017). https://doi.org/10.1007/s11581-017-2104-z

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Keywords

  • Ionic liquid
  • Li-ion battery
  • Ionic conductivity
  • Transference number