Hydrofluoric Acid Modified Porous Magnesia Fibers as Immobilizing Agent for Molten Electrolyte in Thermal Battery

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  • LU Linqiang
    School of Materials Science and Engineering, Southwest University of Science and Technology
  • LIU Jingsong
    School of Materials Science and Engineering, Southwest University of Science and Technology
  • YANG Zhaotang
    Institute of Electronic Engineering China Academy of Engineering Physics
  • LIU Xiaojiang
    Institute of Electronic Engineering China Academy of Engineering Physics
  • YU Hongtao
    School of Materials Science and Engineering, Southwest University of Science and Technology
  • LI Huiqin
    School of Materials Science and Engineering, Southwest University of Science and Technology
  • WANG Fu
    School of Materials Science and Engineering, Southwest University of Science and Technology

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Description

In this work porous MgO fibers were prepared by a hydrothermal method and modified by the reaction with different amounts of hydrofluoric acid solution. Their composition, morphology and porosity were characterized. Separators for thermal batteries were prepared by mixing of definite amounts of dry electrolyte powder (LiCl:KCl = 45:55 wt%) with MgO powder, pristine porous MgO fiber or hydrofluoric acid modified porous MgO fiber. The electrolyte leakage of the separator using the modified porous fibers as the immobilizing agent is lower than that of the separator using MgO powder or pristine fiber as the immobilizing agent. Moreover, the model cells using the modified porous MgO fiber as the immobilizing agent show longer discharge time and larger specific capacity compared with the model cells using MgO powder or pristine fiber as the immobilizing agent. It can be concluded that porous magnesia fibers modified by hydrofluoric acid are a promising immobilizing agent for electrolyte in thermal batteries.

Journal

  • Electrochemistry

    Electrochemistry 85 (8), 451-455, 2017

    The Electrochemical Society of Japan

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