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Ion-plus Salinity Gradient Flow Battery
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  • Chenxiao Jiang,
  • Ying Mei,
  • Xianhui Li,
  • Zhe Yang,
  • Hao Guo,
  • Senlin Shao,
  • Siew-Chong Tan,
  • Tongwen Xu,
  • Chuyang Y. Tang
Chenxiao Jiang
University of Hong Kong Department of Civil Engineering
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Ying Mei
University of Hong Kong
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Xianhui Li
University of Hong Kong Department of Civil Engineering
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Zhe Yang
University of Hong Kong Department of Civil Engineering
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Hao Guo
University of Hong Kong Department of Civil Engineering
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Senlin Shao
University of Hong Kong Department of Civil Engineering
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Siew-Chong Tan
University of Hong Kong Department of Electrical and Electronic Engineering
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Tongwen Xu
University of Sci. and Tech. of China
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Chuyang Y. Tang
University of Hong Kong Department of Civil Engineering
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Abstract

A Salinity Gradient Flow Battery (SGFB) is a novel type of battery that utilizes the selective ion-transition across ion exchange membranes to produce Donnan potential and stores energy in the form of salinity gradient power (SGP). Nevertheless, the commercialization of SGFB had been halted because of the low charging-discharging efficiency due to the relatively high ohmic solution resistance in the low salinity solution. By considering the contribution of supporting ions in a redox flow battery (RFB), we proposed an “Ion-plus SGFB” system by internally-integrating the RFB and SGFB system for the breakthrough of SGFB recycling efficiency. The supporting ions in the salinity solutions overcome the trade-off limitation between Donnan potential and internal-resistance without sacrificing on the SGP, and increase the power density to 1.15 W cm-2 which is two times higher than control system (0.45 W cm-2). The novel designed system is environmental-friendly and gentle for ion exchange membrane