摘要
考察了全钒液流电池多次充放电循环过程中负极电解液中钒离子总量和电池的实际放电量变化,通过负极电解液钒离子总量得出理论放电容量,计算得到电解液在不同充放电循环次数后的利用率。实验证明,由于电解液的跨膜迁移,随着电池充放电次数的增加,电池的负极钒含量逐渐降低,电池理论放电量、实际放电量均降低,电解液理论利用率降低不明显,表明影响钒电池容量衰减的主要因素为电解液的跨膜迁移。实验表明,随着电池充放电次数的增加,电池内阻增大也会在一定程度上加速电池容量的衰减。同时,分析了温度、材料等其他可能加速电池容量衰减的因素。
The total amount of vanadium ions in the negative electrolyte and the actual discharge of the battery were investigated during the multiple charge-discharge cycle of vanadium redox flow battery, theoretical discharge capacity was obtained through the total amount of vanadium ions in negative electrolyte, the utilization ratio of electrolyte after different charge-discharge cycles was calculated. The experiment proves that, with the increase of charge-discharge times of the battery, the negative vanadium content of the battery is gradually reduced, the theoretical discharge and actual discharge of battery are reduced because of transmembrane migration of electrolyte. However, the reduction of theoretical utilization ratio of electrolyte is not obvious. It indicates that the main factor affecting the capacity degradation of vanadium battery is transmembrane migration of electrolyte. Experiments show that, with the increase of charge and discharge times of the battery, the increase of internal resistance of battery will also accelerate the decay of battery capacity to a certain extent. Meanwhile, other factors, such as environment and materials, which may accelerate the cell capacity decay, are analyzed.
作者
刘帅舟
李君涛
史小虎
余龙海
LIU Shuai-zhou;LI Jun-tao;SHI Xiao-hu;YU Long-hai(Hunan Vanadium Valley New Energy Technology Co., Ltd., Changsha Hunan 410000, China;Big Pawer Electrical Technology Xiangyang Co., Ltd., Xiangyang Hubei 441057, China)
出处
《电源技术》
CAS
北大核心
2019年第8期1381-1383,共3页
Chinese Journal of Power Sources
基金
2017年湖北省技术创新专项(2017AAA043)
关键词
全钒液流电池
容量衰减
迁移
内阻
all vanadiumliquid flow battery
capacity degradation
trans-membrane migration
resistance
作者简介
刘帅舟(1990-),男,湖南省人,学士,主要研究方向为钒电池电解液性能提升和产业化开发;通信作者:史小虎(1979-),男,甘肃省人,硕士,主要研究方向为钒电池储能系统及其关键材料的产业化开发。
