用于钒氧化还原液流电池的SPEEK/木质素膜的离子选择性和稳定性增强：磺化程度的影响

Ion Selectivity and Stability Enhancement of SPEEK/Lignin Membrane for Vanadium Redox Flow Battery: The Degree of Sulfonation Effect.

作者信息

Ye Jiaye, Lou Xuechun, Wu Chun, Wu Sujuan, Ding Mei, Sun Lidong, Jia Chuankun

机构信息

College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, China.

State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering, Chongqing University, Chongqing, China.

出版信息

Front Chem. 2018 Nov 12;6:549. doi: 10.3389/fchem.2018.00549. eCollection 2018.

DOI:10.3389/fchem.2018.00549

PMID:30483496

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6240590/

Abstract

A membrane of high ion selectivity, high stability, and low cost is desirable for vanadium redox flow battery (VRB). In this study, a composite membrane is formed by blending the sulfonated poly (ether ether ketone) with lignin (SPEEK/lignin), and optimized by tailoring the degree of sulfonation. The incorporation of lignin into the SPEEK matrix provides more proton transport pathway and meanwhile adjusts the water channel to repulse vanadium ions. The VRB cells assembled with the composite membranes exhibit high coulombic efficiency (~~99.27%) and impressive energy efficiency (~~82.75%). The cells maintain a discharge capacity of ~95% after 100 cycles and ~85% after 200 cycles at 120 mA cm, much higher than the commercial Nafion 212. The SPEEK/lignin composite membranes are promising for application in VRB system.

摘要

钒氧化还原液流电池（VRB）需要一种具有高离子选择性、高稳定性和低成本的膜。在本研究中，通过将磺化聚醚醚酮与木质素（SPEEK/木质素）共混形成复合膜，并通过调整磺化度进行优化。将木质素掺入SPEEK基体中提供了更多的质子传输途径，同时调整了水通道以排斥钒离子。用复合膜组装的VRB电池表现出高库仑效率（约99.27%）和令人印象深刻的能量效率（约82.75%）。在120 mA/cm²的电流密度下，电池在100次循环后保持约95%的放电容量，在200次循环后保持约85%的放电容量，远高于商业Nafion 212。SPEEK/木质素复合膜在VRB系统中具有应用前景。