摘要
电解液的性能和充放电期间的行为会影响全钒液流电池的性能和系统成本。电池运行时,正负极电解液穿过离子交换膜的迁移会导致电解液体积失衡,引起电解液容量损失,限制放电容量、削弱循环稳定性、减少寿命。通过实验探索电解液在充放电过程中的迁移规律,使用二水合草酸作为还原剂还原正极侧过量的VO_(2)^(+),将衰减失效电解液的容量恢复至初始容量的94.33%。改善储液罐设计,当电解液体积向正极侧偏移5%时,进行手动溢流操作,以100 mA/cm~2在1.0~1.7 V循环100次后,电池的放电容量保持率为88.08%。
The performance and behaviors of electrolyte during charge and discharge affect the performance of vanadium redox flow battery and system cost.The transfer of cathode and anode electrolyte through the ion exchange membrane during battery operation can result in volume imbalance and capacity loss of electrolyte,which will limit discharge capacity,impair cycle stability and shorten life.The electrolyte transfer rules under charge and diacharge processes are explored.The capacity of failure electrolyte is recovered to 94.33% of the initial capacity by using oxalic acid dehydrate as a reductant to reduce excessive VO_2~+ on the positive side.The design of storage tank is improved.When the electrolyte moves to the positive side by 5% volume,the manual overflow operation is carried out,the retention rate of battery discharge capacity is 88.08% after 100 cycles at 100 mA/cm~2 in 1.0-1.7 V.
作者
王晓颖
杨霖霖
李林德
魏冬
WANG Xiaoying;YANG Linlin;LI Linde;WEI Dong(Shanghai Electric(Anhui)Energy Storage Technology Co.,Ltd.,Hefei,Anhui 238014,China)
出处
《电池》
CAS
北大核心
2024年第1期82-85,共4页
Battery Bimonthly
关键词
全钒液流电池
电解液迁移
二水合草酸
容量恢复
溢流设计
vanadium redox flow battery
electrolyte transfer
oxalic acid dihydrate
capacity recovery
overflow design
