储能科学与技术2026，Vol.15Issue(8)：3018-3032,15.DOI:10.19799/j.cnki.2095-4239.2026.0277
复合型添加剂对全钒液流电池电解液影响的研究
Study on the effects of composite additives on the electrolyte of all-vanadium redox flow batteries
摘要
Abstract
As the share of clean energy in the electricity generation mix continues to rise,grid-side and generation-side stakeholders must urgently deploy energy storage technologies to suitably manage power demand and ensure stable system operation.In this context,vanadium redox flow batteries(VRFBs),with advantages such as long-duration energy storage capability and intrinsic safety,have attracted significant research interest.The electrolyte is a major cost component of VRFBs,and its stability directly governs the battery electrochemical performance.This study adopts a composite additive strategy to improve electrolyte thermal stability and suppress vanadium precipitation under elevated temperatures.The effects of the composite ratios of MgCl2,(NH4)2SO4,and methanesulfonic acid(MSA)on electrolyte performance were systematically investigated using an orthogonal experimental design.Based on capacity retention rate,the optimal additive formulation was determined to be 0.1 mol/L MgCl2+0.2 mol/L(NH4)2SO4+1.0 mol/L MSA.Battery testing showed that,at 120 mA/cm2 current density,the electrolyte with the composite additive increased energy efficiency from 75%to 79%,discharge capacity from 0.69 Ah to 0.76 Ah,and capacity retention from 83%to 90%after 25 cycles,respectively corresponding to relative improvements of 5.33%,10.14%,and 8.43%.During 230 long-term cycles,the energy efficiency remained stable at 82%,representing a relative improvement of about 9.33%over the control group,while both discharge capacity and capacity retention were significantly higher than those of the additive-free system.After static storage at 50℃for one week,the electrolyte precipitate volume decreased from 11.31 cm3 to 7.72 cm3(a 34.39%reduction).Ion chromatography confirmed that the additive remained stable in the electrolyte over an extended period without significant cross-membrane migration.In summary,this composite additive improves both the electrolyte thermal stability and the battery charge-discharge performance,providing a feasible technical solution for the efficient and stable operation of all-vanadium redox flow batteries.关键词
全钒液流电池/电解液/热稳定性/复合添加剂Key words
all-vanadium redox flow battery/electrolyte/thermal stability/composite additives分类
信息技术与安全科学引用本文复制引用
王熙俊,李朔,马晓涵,董靖,吴华成,范永哲,李世杰,杜安,王志华..复合型添加剂对全钒液流电池电解液影响的研究[J].储能科学与技术,2026,15(8):3018-3032,15.基金项目
国网冀北电力有限公司科技项目(52018K25000Q). （52018K25000Q）
