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<p>Aqueous zinc ion battery (ZIB) demonstrates great potential in energy storage due to eco-friendliness, high safety, and cost-effective. Nevertheless, the electrolyte parasitic reactions, poor stability and dendrite growth of zinc anode limited its realistic application. Herein, we report a ternary aqueous eutectic electrolyte with <i>N</i>-ethylacetamide (Nea), H<sub>2</sub>O and Zn(OTf)<sub>2</sub> to ameliorate these issues. The assembled Zn//Zn battery could cycle for 4590 h at 0.5 mA cm<sup>−2</sup>/0.5 mAh cm<sup>−2</sup> and exhibits high discharge depth of 85.4% at 1.0 mA cm<sup>−2</sup>/5.0 mAh cm<sup>−2</sup>. Systermatic <i>in situ</i> and <i>ex situ</i> characterizations reveal that Nea molecules are preferentially adsorbed on the surface of zinc anode, creating an even interfacial electric field and forming a “de-watering shielding layer” that hinders side reactions. Moreover, a organic/inorganic hybrid solid electrolyte interphase layer is generated on the zinc anode surface, which can effectively inhibit the “tip effect”, and enable rapid diffusion and uniform deposition of zinc ions. Consequently, the Zn//V<sub>2</sub>O<sub>5</sub>·1.6H<sub>2</sub>O battery exhibits a cycle life of more than 5000 cycles and maintains a Coulombic efficiency of close to 100% at 1.0 and 2.0 A g<sup>−1</sup>. This work demonstrates a promising strategy towards advanced ZIB from the perspective of aqueous eutectic electrolyte design.</p>

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Aqueous eutectic electrolyte-derived organic/inorganic hybrid interphase towards reversible zinc electrochemistry for long-life zinc ion batteries

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Xudong Jiang,
  • Kang Xiao,
  • Ting Hu,
  • Kai Yuan,
  • Yiwang Chen

摘要

Aqueous zinc ion battery (ZIB) demonstrates great potential in energy storage due to eco-friendliness, high safety, and cost-effective. Nevertheless, the electrolyte parasitic reactions, poor stability and dendrite growth of zinc anode limited its realistic application. Herein, we report a ternary aqueous eutectic electrolyte with N-ethylacetamide (Nea), H2O and Zn(OTf)2 to ameliorate these issues. The assembled Zn//Zn battery could cycle for 4590 h at 0.5 mA cm−2/0.5 mAh cm−2 and exhibits high discharge depth of 85.4% at 1.0 mA cm−2/5.0 mAh cm−2. Systermatic in situ and ex situ characterizations reveal that Nea molecules are preferentially adsorbed on the surface of zinc anode, creating an even interfacial electric field and forming a “de-watering shielding layer” that hinders side reactions. Moreover, a organic/inorganic hybrid solid electrolyte interphase layer is generated on the zinc anode surface, which can effectively inhibit the “tip effect”, and enable rapid diffusion and uniform deposition of zinc ions. Consequently, the Zn//V2O5·1.6H2O battery exhibits a cycle life of more than 5000 cycles and maintains a Coulombic efficiency of close to 100% at 1.0 and 2.0 A g−1. This work demonstrates a promising strategy towards advanced ZIB from the perspective of aqueous eutectic electrolyte design.