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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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In Situ Colloidal Electrolyte via Anion-Polycation Interaction Enables Stable Zn Metal Batteries.

Yue Wang1, Jianzhong Xu1, Diguang Jia1

  • 1College of Chemistry and Materials Science, Key Laboratory of Analytical Science and Technology of Hebei Province, Hebei University, Baoding 071002, P. R. China.

ACS Nano
|January 26, 2026
PubMed
Summary

A novel colloidal electrolyte using polycation-SO42- interactions enables uniform zinc plating and stripping in aqueous zinc batteries, significantly improving zinc utilization and battery lifespan.

Keywords:
Zn metal anodeanion confinementaqueous Zn batterycolloidal electrolyteinterface chemistry

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc metal batteries (AZMBs) are promising for large-scale energy storage.
  • Challenges include nonuniform zinc plating/stripping, hydrogen evolution, and low zinc utilization rate (ZUR).
  • These issues hinder the practical application of AZMBs.

Purpose of the Study:

  • To develop a novel electrolyte to overcome the limitations of zinc anodes in AZMBs.
  • To enhance zinc deposition/stripping behavior and improve battery performance and stability.

Main Methods:

  • An in situ colloidal electrolyte was created using SO42--polycation electrostatic interaction.
  • Mechanistic studies investigated the electrolyte's effect on zinc deposition and interfacial properties.
  • Electrochemical performance was evaluated using zinc electrodes and Zn//V2O5·nH2O full batteries.

Main Results:

  • The colloidal electrolyte significantly increased the Zn2+ transference number to 0.82, suppressing side reactions.
  • Polycations promoted uniform, (100)-plane-oriented zinc electrodeposits and stripping, achieving 85.4% ZUR at 25 mAh cm-2.
  • Optimized electrodes demonstrated long cycling life (>4200 h), deep-cycling stability, high-temperature adaptability (80 °C), and inhibited cathode dissolution.

Conclusions:

  • The developed colloidal electrolyte effectively addresses key challenges in AZMBs.
  • It enables highly efficient and stable zinc anode performance.
  • This advancement supports the practical application of AZMBs for reliable large-scale energy storage.