储能科学与技术2025，Vol.14Issue(12)：4483-4492,10.DOI:10.19799/j.cnki.2095-4239.2025.0646
基于双电荷中心溴络合剂的高容量锌溴液流电池的研究
Dual-positive charge assembly strategy for bromine management in high-capacity zinc-bromine flow batteries
摘要
Abstract
Capacity decay and cycling instability,which are typically caused by the polybromide shuttle effect(crossover of polybromide anions,Br2n+1-)at high concentrations,are critical issues in zinc-bromine flow batteries(ZBFBs).To address these issues,the suppression mechanism for this shuttle effect and the resultant enhancement of overall electrochemical performance are investigated using a highly hydrophilic dual-charge-center quaternary ammonium bromide complexing agent,N1,N5-dimethyl-N1,N1,N5,N5-tetrakis(2-hydroxyethyl)-1,5-pentanediammonium dibromide(N2MDA),that is developed by the Hoffmann alkylation reaction.The electrostatic-assembly structure and interaction between N2MDA and Br2n+1-are elucidated via density functional theory calculations and proton nuclear magnetic resonance spectroscopy.The results reveal that the"dual-positive charge assembly"strategy significantly enhances the binding affinity of N2MDA to Br2n+1-.The strong electrostatic interaction(N2MDA-Br2n+1-)facilitates the formation of large-volume ionic aggregates at high concentrations,thereby effectively inhibiting the transmembrane Br2n+1-shuttle.By applying the dual-positive charge complexing agent(the N2MDA additive)to ZBFBs,even a low concentration(only 0.10 mol/L)achieves a Coulombic efficiency of more than 90%,and the capacity of the prepared ZBFBs can reach 57.0 Ah/L.Furthermore,the prepared ZBFBs exhibit excellent cycling stability,maintaining a 100%capacity retention over 300 cycles.Overall,a novel material design and mechanistic support for developing efficient bromine management strategies and high-performance ZBFBs are demonstrated.关键词
均相溴络合剂/双电荷中心季铵盐/高容量/锌溴液流电池Key words
homogeneous bromine complexing agent/dual-positive charges quaternary ammonium salt/high capacity/zinc-bromine flow battery分类
化学化工引用本文复制引用
CHEN Junwei,LI Wenjin,WANG Chao,HUANG Guozhi,PENG Siran,WEN Xiankui,FAN Qiang,LI Chaojie,HU Quan,LI Weiping,HAO Guohao..基于双电荷中心溴络合剂的高容量锌溴液流电池的研究[J].储能科学与技术,2025,14(12):4483-4492,10.基金项目
南方电网重大科技专项(GZKJXM20232283). （GZKJXM20232283）
