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Related Experiment Video

Updated: Sep 17, 2025

A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Rigid Framework-Constrained Membranes: A Key to Long-Life Polysulfide/Polyiodide Redox Flow Batteries.

Qingming Hou1,2, Hongyan Cao1,2, Yu Xia1,2

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.

ACS Applied Materials & Interfaces
|July 2, 2025
PubMed
Summary

Polysulfide/polyiodide batteries show promise but suffer from membrane issues. A new composite membrane significantly extends cycle life by preventing ion crossover, enabling stable operation for over 780 hours.

Keywords:
aqueous redox flow batteryion selectivitypolymer of intrinsic microporositypolysulfide/polyiodide redox flow batteryrigid framework-constrained membrane

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Area of Science:

  • Energy Storage
  • Materials Science
  • Electrochemistry

Background:

  • Polysulfide/polyiodide redox flow batteries (PSIBs) offer high capacity and low cost.
  • Challenges include polysulfide/polyiodide crossover and limited cycle life due to membrane swelling.

Purpose of the Study:

  • To develop a rigid framework-constrained membrane to mitigate ion crossover and improve cycle life in PSIBs.
  • To investigate the structural optimization of composite membranes for enhanced battery performance.

Main Methods:

  • Construction of a composite membrane using rigid carbonylated polymer of intrinsic microporosity (cPIM-1) and flexible perfluorosulfonic acid (PFSA).
  • Utilized Quartz Crystal Microbalance and Positron Annihilation techniques to analyze membrane structure and channel size.
  • Tested the performance of the composite membrane in a PSIB.

Main Results:

  • The composite membrane (P/cPIM) successfully constrained the movement of PFSA polymer chains, optimizing membrane structure.
  • PSIBs utilizing the P/cPIM membrane demonstrated stable operation for over 780 hours.
  • This represents a significant improvement compared to the 165 hours achieved with the standard PFSA membrane.

Conclusions:

  • The rigid framework-constrained composite membrane effectively suppresses ion crossover in PSIBs.
  • The developed membrane technology enhances the cycle life and stability of PSIBs, paving the way for their practical application.