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Study on cellulose / ionic liquid doped polybenzimidazole proton conducting membrane and vanadium battery performance

Authors： Sun jiawen, wang lihua, han xutong

Units： 1. School of Materials Science and Engineering, Tiangong University, Tianjin 30087,China; 2.Key Laboratory of Green Printing , Institute of Chemistry ,Chinese Academy of Science, Beijing 100190 , China

KeyWords： polybenzimidazole, cyanoethyl cellulose，proton exchange membrane，proton conductivity

ClassificationCode：TQ050.4+25

year,volume(issue):pagination： 2022,42(4):43-50

Abstract：

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.

Funds：

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.

AuthorIntro：

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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