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<p>In aqueous zinc-ion batteries (AZIBs), Zn anodes often suffer from severe dendrite growth and side reactions. The construction of <i>in-situ</i> solid electrolyte interphase (SEI) is a promising route to address these issues. However, a large amount of salts or organic additives have to be introduced into electrolytes to generate <i>in-situ</i> SEIs, resulting in high cost and low ionic conductivity. Herein, an <i>in-situ</i> solid-phase conversion strategy was developed to construct organic-inorganic hybrid solid electrolyte interphase (HSEI) by introducing 2,4,6-tris-4-(trifluoromethylphenyl)boroxine (TTFPB) layer on Zn anodes. The TTFPB layer can serve as an anion receptor to facilitate the reduction of CF<sub>3</sub>SO<sub>3</sub><sup>−</sup> to generate ZnF<sub>2</sub> with a gradient distribution. The HSEI can accelerate desolvation kinetics and avoid direct contact between electrolyte and anode, ensuring the suppression of side reactions. Simultaneously, the strong zincophilicity of ZnF<sub>2</sub> induces the homogeneous Zn<sup>2+</sup> flux and inhibition of dendrite growth. Therefore, HSEI@Zn anodes exhibit high Coulombic efficiency and the corresponding full cells demonstrate superior electrochemical performance.</p>

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An in-situ solid-phase conversion strategy to construct organic-inorganic hybrid solid electrolyte interphases for highly stable zinc anodes

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Yang Hu,
  • Rui Wang,
  • Yan Zhang,
  • Buyu Ma,
  • Jinlei Tian,
  • Zhiqiang Niu

摘要

In aqueous zinc-ion batteries (AZIBs), Zn anodes often suffer from severe dendrite growth and side reactions. The construction of in-situ solid electrolyte interphase (SEI) is a promising route to address these issues. However, a large amount of salts or organic additives have to be introduced into electrolytes to generate in-situ SEIs, resulting in high cost and low ionic conductivity. Herein, an in-situ solid-phase conversion strategy was developed to construct organic-inorganic hybrid solid electrolyte interphase (HSEI) by introducing 2,4,6-tris-4-(trifluoromethylphenyl)boroxine (TTFPB) layer on Zn anodes. The TTFPB layer can serve as an anion receptor to facilitate the reduction of CF3SO3− to generate ZnF2 with a gradient distribution. The HSEI can accelerate desolvation kinetics and avoid direct contact between electrolyte and anode, ensuring the suppression of side reactions. Simultaneously, the strong zincophilicity of ZnF2 induces the homogeneous Zn2+ flux and inhibition of dendrite growth. Therefore, HSEI@Zn anodes exhibit high Coulombic efficiency and the corresponding full cells demonstrate superior electrochemical performance.