HomeProjectsSustainable Development and Green TechnologiesPolysulfide-based Redox Flow Batteries with Long Life and Low Levelized Cost Enabled by Charge-reinforced Ion-selective Membranes

Polysulfide-based Redox Flow Batteries with Long Life and Low Levelized Cost Enabled by Charge-reinforced Ion-selective Membranes

Project Quick Facts

Principal Investigator

  • Prof. LU Yi Chun

    Department of Mechanical and Automation Engineering

  • Funding

    Research Grants Council

This project designs a novel charge-reinforced ion-selective (CRIS) membrane for sulphur-based redox flow batteries, with 15 consecutive hours of runtime and over 2,000 hours cycling without obvious capacity decay is developed. The new battery has taken a significant step forward in the practical application of redox flow batteries in grid-scale storage for renewable energy, by resolving the problems posed by its poor lifetime and low cost-effectiveness.

Crossover comparison between CUHK’s charge-reinforced ion-selective membrane (CRIS, right) and commercial Nafion membrane (N117, left)
Diagram of a polysulfide-iodide redox flow battery

Uniqueness and Competitive Advantages:

  • Increases the stability and the lifetime of batteries and provides an effective application in grid-scale energy storage devices.
  • An ultralow capacity decay rate (0.005% per day), achieving record high cycling stability and calendar lifetime with over 2,000 hours cycling
  • The coulombic efficiency is more than 99.9%
  • A competitive levelised cost of storage (LCOS) when continuously operated and discharged for more than 15 hours

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