Sulfonated poly(tetramethydiphenyl ether ether ketone) membranes for vanadium redox flow battery application |
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| Authors: | Zhensheng Mai Huamin Zhang Xianfeng Li Cheng Bi Hua Dai |
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| Affiliation: | a PEMFC Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
b Graduate University of the Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | Sulfonated poly(tetramethydiphenyl ether ether ketone) (SPEEK) with various degree of sulfonation is prepared and first used as ion exchange membrane for vanadium redox flow battery (VRB) application. The vanadium ion permeability of SPEEK40 membrane is one order of magnitude lower than that of Nafion 115 membrane. The low cost SPEEK membranes exhibit a better performance than Nafion at the same operating condition. VRB single cells with SPEEK membranes show very high energy efficiency (>84%), comparable to that of the Nafion, but at much higher columbic efficiency (>97%). In the self-discharge test, the duration of the cell with the SPEEK membrane is two times longer than that with Nafion 115. The membrane keeps a stable performance after 80-cycles charge-discharge test. |
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| Keywords: | Ion exchange membranes Vanadium redox flow battery |
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