磺化聚砜/POSS杂化质子传导膜的制备及钒电池性能
作者:郑建丽,王丽华,韩旭彤
单位: 1. 天津工业大学材料科学与工程学院,天津 300387; 2. 中国科学院化学研究所,绿色印刷院重点实验室,北京 100190
关键词: 磺化聚砜;POSS;质子传导膜;全钒液流电池
分类号: TQ050.4+25
出版年,卷(期):页码: 2021,41(3):59-67

摘要:
 将磺化度(DS)为62%的磺化聚砜(SPSF)与笼型倍半硅氧烷(POSS-NH2)进行共混,得到系列SPSF/POSS-NH2杂化质子交换传导膜,研究POSS-NH2含量对SPSF/POSS-NH2膜的吸水率、面电阻、质子电导率、钒离子渗透率、机械强度、耐氧化性能及相应钒电池性能的影响。研究表明,添加POSS-NH2后,热分解温度提高,质子电导率可达10.55 mS/cm,POSS-NH2含量为5 wt%的S-P-5%杂化膜的钒离子渗透率降低至5.47×10-9 cm2/min,质子选择性提高(1.930×106 S•min/cm3),远优于Nafion115膜(1.23×105 S•min/cm3)和纯SPSF膜(S-P-0%膜)(5.41×105 S•min/cm3)。与纯SPSF膜S-P-0%膜相比,S-P-5%为电池效率最佳,库伦效率可稳定维持在99.4%左右,高于Nafion115膜(92.38%)和S-P-0%膜(91.72%),电压效率和能量效率也得到明显提升,300个循环仍然具有较稳定的电池效率,自放电时间达117 h,是Nafion115膜的10倍,POSS的引入为SPSF质子交换传导膜性能的提升提供了新思路。
  A series of SPSF/POSS-NH2 hybrid proton exchange conductive membranes were prepared by blending sulfonated polysulfone (SPSF) with the degree of sulfonation (DS) of 62% and aminopropyllsobutyl polyhedral oligomeric silsesquioxane (POSS-NH2). The effect of content of the POSS-NH2 on the water uptake, area resistance, ptoton proton conductivity, vanadium permeability, mechanical strength, oxidation resistance and the performance of vanadium redox flow battery are investigated in detailed. The results showed that the addition of POSS-NH2 increases the thermal decomposition temperature and proton conductivity to a value of 10.55 mS/cm. When the content of POSS-NH2 is 5wt%, the S-P-5% hybrid membrane exhibited lower vanadium permeability of 5.47×10-9 cm2/min, and higher proton selectivity (1.930×106 S•min/cm3), better than Nafion115 membrane (1.23×105 S•min/cm3) and S-P-0% membrane(5.41×105 S•min/cm3). Compared with S-P-0% membrane, S-P-5% membrane showed the best battery efficiency. Its coulombic efficiency(CE) can be maintained at about 99.4%, which is higher than Nafion 115 membrane (92.38%) and S-P-0% membrane (91.72%). Meanwhile, The the voltage efficiency and energy efficiency have also been significantly improved. The battery efficiency is still stable after 300 cycles, and the self-discharge time is 117 h, which is 10 times than that of Nafion 115 membrane. The introduction of POSS provides a new idea for the improvement of SPSF proton exchange conductive membrane performance.

基金项目:
国家自然科学基金(21878317);北京市自然科学基金-海淀原始创新联合基金(L172047)

作者简介:
郑建丽(1995-),女,山西省长治市,硕士,主要从事质子交换膜研究

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