影响钒电解液电化学性能的因素  

Influences of various factors on the electrochemical performance of vanadium electrolytes

作　　者：张玉贤 扈显琦[1,2] 房少华 

机构地区：[1]承德万利通实业集团有限公司,河北承德067002 [2]承德石油高等专科学校,河北承德067002

出　　处：《储能科学与技术》2014年第2期142-145,共4页Energy Storage Science and Technology

基　　金：国家高技术研究发展计划(863)(2012AA051203);国际科技合作项目(2011DFB60380);河北省重大技术创新项目(12213908Z)

摘　　要：钒电池系统主要由隔膜、极板、电极、正负极电解液储液罐和循环泵等几部分构成。充放电过程中,正负极电解液中钒离子的价态发生变化,实现电能的存储和释放。本工作对钒电解液浓度和温度对电化学循环伏安行为的影响进行了研究。结果表明,在同一温度下,随着钒离子浓度的增大,参加电化学反应的自由钒离子数量增多,可以产生更大的反应电流;同时,随着钒离子浓度的增加,电化学反应的可逆性变差;对于同一浓度下的钒电解液,氧化反应和还原反应的峰值电流值随着温度的升高而增大;适当提高钒电解液温度,可提高电化学反应速率,提高产生的电流密度。对同一浓度钒电解液而言,硫酸浓度对其电化学性能也有影响。实验证明,硫酸浓度为3 mol/L时,钒电解液性能较好。Vanadium flow battery systems consist mainly of membrane separators, electrode plates, electrodes, electrolyte storage tanks and circulation pumps. Energy storage is realized through changes to vanadium ion valence states in the charge and discharge processes. In this study, effects of vanadium electrolyte concentration and temperature on the electrochemical cyclic voltammetric behavior are investigated. The results show that, for a given temperature, the number of ions participating in the electrochemical reactions increases with increasing vanadium ion concentrations, leading to an increased output current. However, the reversibility of electrochemical reaction becomes poorer with increasing vanadium ion concentration. For a given vanadium concentration in the electrolyte, the peak current due to oxidation and reduction reactions increases with increasing temperature. The results also show that the current density of the electrochemical reactions could be increased by increasing the temperature of vanadium electrolyte within a certain range. For a given vanadium concentration in the electrolyte, the sulfuric acid concentration is also an important factor with 3 mol/L giving a good performance of vanadium electrolyte.

关 键 词：钒电池 钒电解液 电化学 循环伏安 

分 类 号：TM911[电气工程—电力电子与电力传动]