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一种新型的硫化聚胺复合膜,含有硫化多孔材料,用于全回氧流电池

Xuesong Li¹, Gang Wang¹, Shuwen Zhang¹

¹College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.

ACS applied materials & interfaces

|September 25, 2024

概括

一种新的多孔共价有机框架 (COF) 材料,具有内置-SO3H部分 (PP-SO3H) 的多相烯,增强了硫化聚胺 (SPI) 膜. 这提高了氧还原流电池 (VRFB) 的电池效率和循环稳定性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
聚合物化学聚合物化学

背景情况:

硫化聚胺 (SPI) 膜对于储能至关重要,但在平衡导电性和离子透性方面面临挑战.
提高离子选择性和循环稳定性是提高电池性能的关键.

研究的目的:

为了合成一种新型的多孔共价有机框架 (COF) 材料,聚酸具有内置的 -SO3H 分子 (PP-SO3H).
通过结合PP-SO3H来提高硫化聚胺 (SPI) 膜在电池应用中的性能.
研究PP-SO3H对膜导电性,离子选择性,机械强度和循环稳定性的影响.

主要方法:

PP-SO3H的简单合成是通过六环三酸盐 (HCCP) 和p-diaminobenzenesulfonic acid的聚合物组合.
在SPI/PP-SO3H复合膜的制造.
电化学测试包括导电性,离子选择性,库伦比效率 (CE) 和能效 (EE) 测量.
机械强度评估和表面静电电位 (ESP) 理论计算.
在氧还原流电池 (VRFB) 中进行长期循环稳定性测试.

主要成果:

SPI/PP-SO3H复合膜表现出极好的导电性 (高达114.8mS cm-1).
离子选择性得到了显著的改善 (比SPI基膜高2.18倍),达到11.69 × 10^4 S min cm-3.
增强机械强度和提高电池性能:CE为98.92%,EE为84.1%在100 mA cm-2下,自放电时间长3.5倍.
卓越的循环稳定性,SPI/2% PP-SO3H膜在VRFB中持久超过400个循环.

结论:

合成的PP-SO3H材料有效地解决了SPI膜中导电性和离子透性之间的权衡问题.
SPI/PP-SO3H复合膜显著提高了电化学性能和耐用性.
这些先进的膜在氧化还原流电池 (VRFB) 中的实际应用方面非常有前途.

关键词:

全瓦纳氧化还原流电池的电池是全瓦纳的.共价有机框架是共价有机框架.离子选择性的离子选择性.机械稳定性机械稳定性硫化多孔材料是一种硫化多孔材料.

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