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掺杂纤维素/离子液体的聚苯并咪唑质子传导膜及钒电池性能研究

作者：孙佳雯，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，北京100190

关键词：聚苯并咪唑；氰乙基纤维素；质子传导膜；质子电导率

DOI号：

分类号： TQ050.4+25

出版年,卷(期):页码： 2022,42(4):43-50

摘要：

质子化后的聚苯并咪唑（PBI）膜因同时具备传输质子和阻隔钒离子能力，常被用作全钒液流电池（VRFBs）质子传导膜，但是较低的质子电导率严重影响其实际应用。本文通过使用氰乙基纤维素/离子液体（CEC@ILs）作为改性剂，直接掺杂到PBI基体中构建了一系列PBI/CEC@ILs全钒液流电池质子传导膜。研究了吸水率、面电阻、质子电导率、钒离子渗透率以及相应电池循环性能等性能。结果表明：CEC的掺杂能有效改善PBI的质子电导率，在电流密度120mA/cm2下，PBI/CEC@ILs-3%的电压效率（EV）和能量效率（EE）可达81.8%、79.5%。经过300次循环后EE值仍可保持在78%以上，并且自放电时间600h后电压没有明显下降，均优于PBI膜和Nafion115膜。

The protonated polybenzimidazole (PBI) membrane has the ability to transport protons and block vanadium ions,.Therefore,it is often used as a proton conducting membrane for all-vanadium flow batteries (VRFBs), but the lower proton conductivity seriously affects its practicality. application. In this paper, a series of PBI/CEC@ILs in vanadium redox flow battery proton-conducting membranes were constructed by using cyanoethyl cellulose/ionic liquid (CEC@ILs) as the modifier and directly mixed into the PBI matrix. The properties of water absorption, surface resistance, proton conductivity, vanadium ion permeability, and corresponding battery cycle performance were studied. The results show that the doping of CEC can effectively improve the proton conductivity of PBI. At the current density of 120mA/cm2, the voltage efficiency (VE) and energy efficiency (EE) of PBI/CEC@ILs-3% can reach 81.8%、79.5%. After 300 cycles, the EE value can still remain above 78%, and the voltage does not drop significantly after the self-discharge time of 600h, which is better than PBI membrane and Nafion115 membrane.

基金项目：

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

作者简介：

孙佳雯（1996-），女，辽宁凌海市人，硕士，主要从事质子交换膜方向研究

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