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- Title
具有同分异构体的磺化聚酰亚胺质子交换 膜对全钒液流电池性能影响.
- Authors
刘 鑫; 马 磊; 杨 洁; 刘 蕾; 王 超
- Abstract
Because the polymers with isomeric structure have obvious differences in performance, in this work, 1,4, 5,8-naphthalenetetracarboxylic dianhydride (NTDA) is used as dianhydride monomer, and 3,3-diaminodiphenylsulfone and 4,4'- diaminodiphenylsulfone were used to provide isomeric structural unit, using 4,4'- diaminobiphenyl- 2,2'- disulfonic acid hydrate as sulfonated diamine monomer. Two kinds of the sulfonated polyimides (SPI) with different spatial configurations were prepared and used as proton exchange membranes (PEM) in vanadium redox flow batteries (VRFB). The helical structure of 3,3'- diaminodiphenyl sulfone can effectively enhance the flexibility of chemical structure of 3- SPI, contributing to the entanglement of molecular chains, and make it have excellent mechanical properties, dimensional stability, and vanadium resistance (8.08×10-8 cm²/min). The ionic conductivity (47.21 mS/cm) of the 4-SPI configuration is similar to that of the Nafion 212 membrane (49.37 mS/cm), but the ionic selectivity (4.25×105 S · min/cm³) is about 4 times of that of Nafion 212(1.08×105 S · min/cm³). In the single-cell test, the 4-SPI still shows good comprehensive performance, and the energy efficiency(EE) reaches 77% at the current density of 160 mA/cm². At the same time, the 4-SPI also show a good stability, and its EE remains above 84% after 30 cycles.
- Subjects
VANADIUM redox battery; HELICAL structure; IONIC conductivity; CHEMICAL structure; POLYMER structure
- Publication
Polymer Materials Science & Engineering, 2023, Vol 39, Issue 8, p134
- ISSN
1000-7555
- Publication type
Article
- DOI
10.16865/j.cnki.1000-7555.2023.0180