温度对钒电池性能的影响

Effects of temperature on the performance of vanadium redox flow battery

利用自行组装的实验室用钒氧化还原液流单电池,考察了25～45℃范围内温度对钒电池充放电电压、库仑效率、能量效率和自放电性能的影响,并对其影响机理进行了初步研究和讨论。结果表明:随着温度的升高,钒电池的平均库仑效率从25℃时的90.7%降到了45℃的87.4%;而电池的能量效率从25℃的81.6%降到了45℃的78.8%。研究表明:温度对电池自放电性能的影响尤为明显,在25℃时,电池的开路电压保持在0.8V以上的时间为27h,而在45℃则只能保持16h。

Average coulombic efficiency, average energy efficiency, self-discharge and charge-discharge process of single vanadium redox flow cell was assembled and tested under temperature from 25--45 ℃. The mechanism of how temperature affecting the performance of VRB was investigated and discussed. Results showed that the average coulombic efficiency （CE） and average energy efficiency （EE） were reduced from 90.7% （25℃） to 87.4% （45 ℃） and from 81.6% （25℃） to 78.8% （45 ℃）, respectively. At 25 ℃,open circuit voltage （OCV） of the cell during self-discharge process can keep 27 h beyond 0.8 V, while OCV can only keep 16 h beyond 0.8 V at 45 ℃.