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Abstract <p>The cycling of a tin–ultrafine tin powder composite electrode in a gel–polymer electrolyte based on polyvinylidene difluoride (PVDF) has been studied. It is shown that the cathodic introduction of lithium into the tin–ultrafine tin powder composite electrode from a PVDF-based gel–polymer electrolyte is accompanied by disordering of the initial structure, which enables the subsequent intercalation and leads to an increase in the lithium diffusion coefficient from 10<sup>–14</sup> to 10<sup>–10</sup> cm<sup>2</sup>/s with increasing stoichiometry of the intercalate. The specific capacity of the electrode with the gel–polymer electrolyte amounts to 500–700&#xa0;mAh/g for the first 10 cycles and decreases to 110 mAh/g after 100 cycles. The stability of the electrode macrostructure during cycling is related to the additional binding of the gel–polymer film. The specific capacity drop during cycling is caused by the rupture of the gel–polymer film and partial exclusion of the electrode surface from the cycling process. To prevent this phenomenon, it is necessary to search for gel–polymer electrolyte compositions with increased mechanical stability.</p>

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Study of a Tin-Based Composite Anode in a Gel–Polymer Electrolyte

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • M. S. Lipkin,
  • Y. V. Verdi,
  • O. Y. Reznikova,
  • A. Y. Domanyuk,
  • E. V. Korbova,
  • A. V. Emelin,
  • V. M. Lipkin,
  • A. V. Semenkova

摘要

Abstract

The cycling of a tin–ultrafine tin powder composite electrode in a gel–polymer electrolyte based on polyvinylidene difluoride (PVDF) has been studied. It is shown that the cathodic introduction of lithium into the tin–ultrafine tin powder composite electrode from a PVDF-based gel–polymer electrolyte is accompanied by disordering of the initial structure, which enables the subsequent intercalation and leads to an increase in the lithium diffusion coefficient from 10–14 to 10–10 cm2/s with increasing stoichiometry of the intercalate. The specific capacity of the electrode with the gel–polymer electrolyte amounts to 500–700 mAh/g for the first 10 cycles and decreases to 110 mAh/g after 100 cycles. The stability of the electrode macrostructure during cycling is related to the additional binding of the gel–polymer film. The specific capacity drop during cycling is caused by the rupture of the gel–polymer film and partial exclusion of the electrode surface from the cycling process. To prevent this phenomenon, it is necessary to search for gel–polymer electrolyte compositions with increased mechanical stability.