Design of Solid Polycationic Electrolyte to Enable Durable Chloride-Ion Batteries

Xu Yang, Zhiqiang Fu, Ran Han, Yaojie Lei, Shijian Wang, Xin Zhao, Yuefeng Meng, Hao Liu, Dong Zhou, Doron Aurbach, Guoxiu Wang

Research output: Contribution to journalArticlepeer-review

Abstract

The high energy density and cost-effectiveness of chloride-ion batteries (CIBs) make them promising alternatives to lithium-ion batteries. However, the development of CIBs is greatly restricted by the lack of compatible electrolytes to support cost-effective anodes. Herein, we present a rationally designed solid polycationic electrolyte (SPE) to enable room-temperature chloride-ion batteries utilizing aluminum (Al) metal as an anode. This SPE endows the CIB configuration with improved air stability and safety (i.e. free of flammability and liquid leakage). A high ionic conductivity (1.3×10−2 S cm−1 at 25 °C) has been achieved by the well-tailored coordination structure of the SPE. Meanwhile, the solid polycationic electrolyte ensures stable electrodes|electrolyte interfaces, which effectively inhibit the growth of dendrites on the Al anodes and degradation of the FeOCl cathodes. The Al|SPE|FeOCl chloride-ion batteries showcased a high discharge capacity around 250 mAh g−1 (based on the cathodes) and extended lifespan. Our electrolyte design opens a new avenue for developing low-cost chloride-ion batteries.

Original languageEnglish
JournalAngewandte Chemie - International Edition
Early online date25 Apr 2024
DOIs
StateE-pub ahead of print - 25 Apr 2024

Bibliographical note

Publisher Copyright:
© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.

Keywords

  • air stability
  • aluminum metal anode
  • chloride-ion battery
  • interfacial compatibility
  • solid polycationic electrolyte

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