Affiliation:
1. State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University No. 30 Puzhu South Road Nanjing 211816 China
2. Suzhou Laboratory No. 388 Ruoshui Road Suzhou 215123 China
3. State Key Laboratory of Chemical Engineering East China University of Science and Technology No. 130 Meilong Road Shanghai 200237 China
Abstract
AbstractVanadium flow battery (VFB) is one of the most reliable stationary electrochemical energy‐storage technologies, and a membrane with high vanadium resistance and proton conductivity is essential for manufacturing high‐performance VFBs. In this study, a two‐dimensional (2D) MFI‐type zeolite membrane was fabricated from zeolite nanosheet modules, which displayed excellent vanadium resistance (0.07 mmol L−1 h−1) and proton conductivity (0.16 S cm−1), yielding a coulombic efficiency of 93.9 %, a voltage efficiency of 87.6 %, and an energy efficiency of 82.3 % at 40 mA cm−2. The self‐discharge period of a VFB equipped with 2D MFI‐type zeolite membrane increased up to 116.2 h, which was significantly longer than that of the commercial perfluorinated sulfonate membrane (45.9 h). Furthermore, the corresponding battery performance remained stable over 1000 cycles (>1500 h) at 80 mA cm−2. These findings demonstrate that 2D MFI‐type membranes are promising ion‐conductive membranes applicable for stationary electrochemical energy‐storage devices.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China