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。对不同浓度的钒电解液在不同温度下的电化学循环伏安行为进行了研究。结果表明,在同一温度下,随着含钒离子浓度增大,参加电化学反应的离子数量增多,钒电池可以产生更大的输出电流。同时随着含钒离子浓度增加,电化学反应的可逆性变差,钒电池充放电循环过程的能量损失将会增加,这势必会降低电池的能量效率;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,可提高全钒液流电池的输出电流。
Vanadium battery system is mainly composed of diaphragm, electrode plates, electrodes; electrolyte storage tank and circulation pump and so on. The changes of vanadium ion valence state during charging and discharging realize the energy storage and release. The electrochemical cyclic voltammetric behaviors were studied in various concentrations of vanadium electrolyte at different temperatures. The results show that the ion number participating in the electrochemical reaction increases with the increase of the vanadium ion concentration at the same temperature, and vanadium battery can produce larger output current. Simultaneously, the reversibility of electrochemical reaction tends to be poor with the increase of vanadium ion concentration and the energy loss of vanadium battery during charge and discharge cycles will increase, which will reduce the energy efficiency. For vanadium electrolyte under the same concentration, the peak current value of oxidation and reduction reaction increases with the rising of temperature. It proves that the output current of the vanadium flow battery can be improved by properly increasing the temperature of vanadium electrolyte.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第7期1264-1266,共3页
Chinese Journal of Power Sources
基金
国家"863"计划(2012 AA 051203)
关键词
钒电池
钒电解液
电化学
循环伏安
vanadium battery
vanadium electrolyte
electrochemistry
cyclic voltammograms
