Effects of Lithium Salt Concentration in Ionic Liquid Electrolytes on Battery Performance of LiNi<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>O<sub>2</sub>/Graphite Cells

DOI Web Site 研究データあり 参考文献21件
  • TAKAHASHI Takuya
    iElectrolyte Co., Ltd., Center for Innovation & Creativity of Kansai University Department of Chemistry and Life Science, Yokohama National University
  • ISHIKAWA Masashi
    iElectrolyte Co., Ltd., Center for Innovation & Creativity of Kansai University Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University
  • UGATA Yosuke
    Department of Chemistry and Life Science, Yokohama National University
  • DOKKO Kaoru
    Department of Chemistry and Life Science, Yokohama National University Advanced Chemical Energy Research Center (ACERC), Institute of Advanced Sciences, Yokohama National University
  • WATANABE Masayoshi
    Advanced Chemical Energy Research Center (ACERC), Institute of Advanced Sciences, Yokohama National University

抄録

<p>Ionic liquids (ILs) possess low volatility and low flammability and are promising electrolytes for thermally stable Li-ion batteries (LIBs). Among ILs, bis(fluorosulfonyl)imide (FSI−) anion-based ILs have low viscosity and high ionic conductivity and FSI-based electrolytes are useful for achieving a high power density LIB. In this study, we investigated the effects of LiFSI concentration in IL electrolytes on the performance of LIBs. We prepared electrolytes composed of 1-ethyl-3-methyl imidazolium bis(fluorosulfonyl)imide (EMImFSI) and LiFSI. The ionic conductivity of the electrolyte decreased with increasing LiFSI concentration due to an increase in viscosity; however, the Li+ transference number increased with increasing LiFSI concentration. The IL electrolyte was tested in a LiNi0.5Mn0.3Co0.2O2/graphite pouch cell. The discharge rate capability of the cell was improved by increasing the LiFSI concentration. The higher LiFSI concentration was effective in suppressing the depletion of Li+ in the vicinity of the cathode during the high current discharge. Furthermore, we demonstrated that cells with IL electrolytes can be stably operated over 500 charge-discharge cycles at 25 °C and 60 °C.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 89 (5), 455-460, 2021-09-05

    公益社団法人　電気化学会

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