隔膜对双电层电容器和混合型电池-超级电容器的电化学性能的影响（英文）

发布时间：2018-01-28 02:23

本文关键词： 双电层电容器混合型电池-超级电容器吸液量表观接触角自放电　出处：《物理化学学报》2014年03期 　论文类型：期刊论文

【摘要】：隔膜是双电层电容器和混合型电池-超级电容器等电化学储能器件的重要组成元件.本文采用1 mol?L-1四乙基四氟硼酸铵的丙烯碳酸酯电解液制备了基于活性炭的扣式双电层电容器,并采用1 mol?L-1六氟磷酸锂锂离子电解液制备了(LiNi0.5Co0.2Mn0.3O2+活性炭)/石墨体系的混合型电池-超级电容器.研究了不同类型隔膜的物理化学性能,以及其对双电层电容器和混合型电池-超级电容器的电化学性能的影响.四种隔膜分别是无纺布聚丙烯毡、多孔聚丙烯薄膜、Al2O3涂层的聚丙烯薄膜和纤维素纸隔膜.进行了表面形貌、差示扫描量热、电解液吸液量和表观接触角测试表征.电化学测试表明,采用纤维素隔膜的双电层电容器具有最高的比电容和更优的倍率性能,电容器的自放电性能差别不大.而对于混合型电池-超级电容器,采用聚丙烯薄膜和无纺布聚丙烯毡隔膜器件的比容量比其它器件约高20%,且采用纤维素隔膜的器件自放电率最高.
[Abstract]:Diaphragm is an important component of electrochemical energy storage devices such as double layer capacitors and hybrid battery-supercapacitors. The activated carbon based double layer capacitor was prepared from the electrolyte of propylene carbonate of tetraethyl tetrafluoroborate ammonium tetrafluoroborate, and 1 mol? LiNi0.5Co0.2Mn0.3O2 activated carbon was prepared from lithium hexafluorophosphate Li-ion electrolyte. The physical and chemical properties of different types of membranes were studied. And its influence on the electrochemical performance of double layer capacitor and hybrid battery supercapacitor. The four kinds of diaphragm are non-woven polypropylene felt and porous polypropylene film. The surface morphology, differential scanning calorimetry, electrolyte absorption and apparent contact angle of Al2O3 coated polypropylene film and cellulosic paper separator were measured. The double layer capacitor with cellulose membrane has the highest specific capacitance and better rate performance. The self-discharge performance of the capacitor is not different. But for the hybrid battery-supercapacitor. The specific capacity of polypropylene film and non-woven polypropylene felt separator is about 20% higher than that of other devices, and the self-discharge rate of the device with cellulose film is the highest.
【作者单位】：中国科学院电工研究所应用超导重点实验室;
【基金】：supported by the National Natural Science Foundation of China(51025726,51307167)~~
【分类号】：TM53
【正文快照】： 1 IntroductionElectrical double-layer capacitor(EDLC),also known as su-percapacitor,is a type of important electrochemical energy stor-age device.1It has attracted increasing attentions due to its ad-vantages over traditional electrochemical energy stora

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