Details

Autor(en) / Beteiligte

• Zhang, Shuai
• Li, Jinchao
• Huang, Xiaodong
• Zhang, Yaping
• Zhang, Yongde

Titel

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Ist Teil von

• Polymer journal, 2015-10, Vol.47 (10), p.701-708

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A sulfonated poly(imide-siloxane) (SPI-PDMS) membrane was prepared and evaluated for its performance in a vanadium redox flow battery (VRFB). Fourier transform infrared spectroscopy analysis verified the successful synthesis of SPI-PDMS, and scanning electron microscopy images and energy-dispersive spectroscopy results illustrated the homogeneity of the membrane. The chemical stability of the SPI-PDMS membrane was superior to that of the pristine sulfonated polyimide membrane. The as-prepared SPI-PDMS membrane showed an order-of-magnitude lower permeability of VO 2+ ion (1.92 × 10 −7  cm 2  min −1 ) in contrast to Nafion 117 (17.1 × 10 −7  cm 2  min −1 ) and it possessed a much longer self-discharge time (550 h above 1.3 V) than Nafion 117 (65 h above 1.3 V). The SPI-PDMS-containing VRFB exhibited higher coulombic efficiency (98.50%–99.10%) at current densities ranging from 20 to 80 mA cm −2 than that of Nafion 117 (80.6%–94.8%). At current densities lower than 70 mA cm −2 , the energy efficiency of the SPI-PDMS-containing VRFB was higher than that of Nafion 117. Cyclic charge–discharge testing demonstrated that the VRFB containing the SPI-PDMS membrane had good operational stability. Overall, this low-cost SPI-PDMS membrane exhibits excellent battery performance and has considerable potential for applications in VRFBs. The as-prepared SPI-PDMS membrane possessed lower permeability of VO 2+ ion and higher proton selectivity than Nafion 117 membrane. The coulombic efficiency and energy efficiency of the SPI-PDMS-containing VRFB was higher than that of Nafion 117 membrane for 50 cycles at the current density of 30 mA cm −2 and another 50 cycles at 60 mA cm −2 . Overall, this low-cost SPI-PDMS membrane exhibits excellent battery performance and has considerable potential for applications in VRFBs.