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      https://www.ias.ac.in/article/fulltext/boms/043/0075

    • Keywords

       

      Sodium ions electrolyte; quasi-solid state; Na$_2$O−B$_2$O$_3$−SiO$_2$−H$_2$O system hydrated glass; voltage window; ionic conductivity; cycle performance.

    • Abstract

       

      Na$_2$O−B$_2$O$_3$−SiO$_2$−H$_2$O system hydrated glass with $T_{\rm g}$ ranges from $−$10 to 150$^{\circ}$C is synthesized by aqueouschemical methods and is applied to symmetrical cells as quasi-solid electrolyte. At the temperature around $T_{\rm g}$, the solid state transforms to quasi-solid state, whose mechanical property keeps like gel electrolyte, but the conductivity leaps from $5.31 \times 10^{−6}$ S cm$^{−1}$ to $5.43 \times 10^{−3}$ S cm$^{−1}$, much higher than most of the glass–ceramic electrolytes. As most of the solvated water is evaporated, H$_2$O left in the system distributes in the intervals as hydroxyl, which is much benefit to the ions transportation, and more important is to increase the voltage window to 2.24 V and even higher. The cycle performance is also researched. After 1000 circulations, there is still 65% capacity retention and no obvious damage is discovered in the electrolyte, which means much better cycle property of the electrolyte than gel electrolyte. Other compositions in the quasi-solid system including different contents of B$_2$O$_3$, Na$_2$SO$_4$ and m in sodium silicate NaO$_2$·mSiO$_2$ are also studied. In general, quasi-solid Na$_2$O−B$_2$O$_3$−SiO$_2$−H$_2$O system owns better conductivity and cycle performance than mostglass–ceramic solid electrolyte, and it is environment-friendly, inexpensive and practical to be used as sodium ions quasi-solid electrolyte.

    • Author Affiliations

       

      YINGMING ZHAO1 FAN TONG1 CHENYAO FAN1 SIQI YU1 BING HAN1 JIAYANG GAO1 YUNCHAO LOU1 PENGLIN JIANG1 ZHIYU WANG1

      1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China

    • Dates

       
      Published
      18 February 2020
      Manuscript received
      29 August 2019
      Accepted
      29 November 2019
      Final version published online
      18 February 2020

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

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