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Formulating Self-Repairing Solid Electrolyte Interface via Dynamic Electric Double Layer for Practical Zinc Ion

Siqi Qin1, Jie Zhang1, Mi Xu1

  • 1Power Battery and Systems Research Center, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China.

Angewandte Chemie (International Ed. in English)
|July 23, 2024
PubMed
Summary

A novel dual-site additive creates a dynamic electrical double layer and self-repairing SEI, enhancing zinc ion battery performance and stability. This innovation addresses key interface challenges for practical, long-lasting zinc batteries.

Keywords:
Aqueous BatteriesDual-site AdsorptionDynamic Electrical Double LayerElectrolyte EngineeringSelf-Repairing Solid Electrolyte Interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Zinc ion batteries (ZIBs) face challenges with water-rich electrical double layers (EDLs) and unstable solid-electrolyte interphases (SEIs).
  • These interface issues hinder the long-term stability and practical application of ZIBs.

Purpose of the Study:

  • To develop a dynamic EDL and a self-repairing hybrid SEI for practical ZIBs.
  • To improve interfacial kinetics, regulate Zn deposition, and suppress side reactions during cycling.

Main Methods:

  • Incorporation of a horizontally-oriented dual-site additive into the ZIB system.
  • Analysis of additive's role in constructing a dynamic EDL and a self-repairing organic-inorganic hybrid SEI via electrochemical decomposition.
  • Evaluation of battery performance under various conditions, including long-term cycling, lean electrolyte, high loading, and low temperatures.

Main Results:

  • The dynamic EDL and self-repairing SEI effectively accelerate interfacial kinetics and suppress side reactions.
  • High reversibility was achieved for 500 hours at 42.7% depth of discharge.
  • Zn//NVO full cells demonstrated excellent cycling stability for 10,000 cycles with 100% capacity retention at 3 A·g⁻¹, and over 3000 cycles under lean electrolyte and high loading conditions.
  • The strategy proved effective even in low-temperature (-30°C) full cells.

Conclusions:

  • The proposed dynamic EDL and self-repairing hybrid SEI strategy significantly enhances ZIB performance and durability.
  • This approach offers a promising solution for overcoming interfacial limitations in practical ZIB applications.
  • The method shows broad applicability, including challenging conditions like low temperatures and high energy densities.