动力型超级电容器漏液模式下的性能研究

Research on the performance of electrolyte leakage power-based supercapacitor

高能量密度和高功率密度的动力型超级电容器因其突出的性能优势成为了新型储能与节能应用市场的重点发展方向。在模拟单体漏液的工况条件下,本工作以商品化动力型超级电容器为实验对象,对比分析了漏液前后单体表面及电化学性能的差异,比较了高温加速寿命测试过程单体的性能变化。结果表明,漏液后电解液将以银白色晶体形式呈现,漏液量达12 g以上后,单体容量、内阻值将急剧衰减,当漏液量达28.5 g后,单体容量将下降12.1%,内阻增大31.3%。高温加速寿命测试过程漏液单体(Cap-4)泄压频次增多,容量衰减38.4%、内阻上升85.1%。

With the excellent energy density and power density,power-based supercapacitor has been regarded as the most important devices for energy storage and saving system.After simulated the electrolyte leakage situation,using the commercial power-based supercapacitor as the target,the comparison between leakage and no-leakage electrolyte cells have been analyzed,and its high temperature accelerated life test also been discussed.It shows that silver crystal appears,and once the leakage amount is more than 12 g,cell＇s capacitance and ESR will decrease dramatically.When the amount is over 28.5 g,cell＇s capacitance and ESR will drop off near 12.1% and 31.3%,respectively.The accelerated life test（Cap-4） also revealed that the over leakage cell will represent more gas release times,and its capacitance will decrease 38.4% and ESR reaches 85.1%.