All-in-one and bipolar-membrane-free acid-alkaline hydrogel electrolytes for flexible high-voltage Zn-air batteries

Siyuan Zhao, Tong Liu, Yawen Dai, Yang Wang, Zengjia Guo, Shuo Zhai, Jie Yu, Chunyi Zhi, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The low operating voltage of 1.4 V limits the widespread application of flexible Zn-air batteries (ZABs) in wearable electronics. However, a high-voltage flexible ZAB has not been achieved yet, which results from the few choices of fitted flexible electrolytes. Now we propose a novel, universal, and simple strategy to design all-in-one and membrane-free acid-alkaline flexible electrolytes based on thermo-reversible Pluronic® F127 hydrogels. Benefiting from the unique sol–gel transition property of Pluronic® F127 hydrogel, the acid and alkaline can be decoupled but integrated simultaneously in one hydrogel. Surprisingly, the as-developed ZAB achieves an unprecedentedly high voltage of 2 V, surpassing all the existing flexible ZABs. Meanwhile, this battery exhibits remarkable high-voltage stability of 37 h and a large area capacity of 1.35 mAh cm−2 without the use of costly bipolar membranes. Our work presents a pioneering example for flexible high-voltage ZAB and may further inspire other designs of flexible high-voltage aqueous batteries and decoupled dual-electrolyte batteries.

Original languageEnglish
Article number132718
JournalChemical Engineering Journal
Volume430
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • Acid-alkaline electrolyte
  • All-in-one
  • High-voltage
  • Hydrogel electrolyte
  • Thermo-reversible hydrogel
  • Zinc-air battery

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this