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A cost-effective alkaline polysulfide-air redox flow battery enabled by a dual-membrane cell architecture

  • Xia, Y
  • Ouyang, M
  • Yufit, V
  • Tan, R
  • Regoutz, A
  • Wang, A
  • Mao, W
  • Chakrabarti, B
  • Kavei, A
  • Song, Q
  • Kucernak, A
  • Brandon, N
Publication Date
Apr 14, 2022
UPCommons. Portal del coneixement obert de la UPC
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With the rapid development of renewable energy harvesting technologies, there is a significant demand for long-duration energy storage technologies that can be deployed at grid scale. In this regard, polysulfide-air redox flow batteries demonstrated great potential. However, the crossover of polysulfide is one significant challenge. Here, we report a stable and cost-effective alkaline-based hybrid polysulfide-air redox flow battery where a dual-membrane-structured flow cell design mitigates the sulfur crossover issue. Moreover, combining manganese/carbon catalysed air electrodes with sulfidised Ni foam polysulfide electrodes, the redox flow battery achieves a maximum power density of 5.8 mW cm-2 at 50% state of charge and 55 °C. An average round-trip energy efficiency of 40% is also achieved over 80 cycles at 1 mA cm-2. Based on the performance reported, techno-economic analyses suggested that energy and power costs of about 2.5 US$/kWh and 1600 US$/kW, respectively, has be achieved for this type of alkaline polysulfide-air redox flow battery, with significant scope for further reduction.

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