电极结构对(NCM+AC)/HC混合型电容器电性能的影响  

Influences of electrode structure on the electrical properties of(NMC+AC)/HC hybrid capacitor

作　　者：何凤荣 张啟文 郭德超 郭义敏 郭孝东[1] HE Fengrong;ZHANG Qiwen;GUO Dechao;GUO Yimin;GUO Xiaodong(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Dongguan Dongyangguang Technology Research&Development Co.,Ltd.,Dongguan 523871,Guangdong,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]东莞东阳光科研发有限公司,广东东莞523871

出　　处：《储能科学与技术》2022年第7期2051-2058,共8页Energy Storage Science and Technology

基　　金：超级电容器产品技术与工艺开发(131013)。

摘　　要：混合型电容器是一种介于锂二次电池和超级电容器之间的一种新型储能器件,在电化学储能领域有非常广泛的应用。混合型电容器的电极材料包括锂二次电池电极材料和超级电容器电极材料,在混合电容器内部形成“交叉结构”。本工作分别采用干法和湿法工艺制备出(NCM+AC)混合型正极片和硬碳负极片,并装配成064060软包混合型电容器。本工作系统分析了两种电极结构的特点及其对软包混合型电容器性能的影响。实验结果表明,干法电极内部含有丰富的PTFE纤维结构,原材料颗粒之间接触更为紧密。在相同厚度下,干法电极的活性物质负载量更大,电极体积密度大、欧姆电阻及极化电阻均较小。在相同体积的软包产品内,干法电极产品的容量、能量密度较湿法电极产品均提高20%以上。在正负极面密度比及N/P放电容量比均相同的条件下,干法电极产品在高低温性能、循环性能、倍率性能及高温负荷性能方面均优于湿法电极产品。干法电极制备工艺不使用任何溶剂,绿色环保,节省成本,PTFE纤维可以牢固地兜住NCM和AC,有助于在混合型电容器电极制备中推广应用。A hybrid capacitor is a novel form of energy storage device that combines the advantages of both a lithium secondary battery and a supercapacitor.It is widely used in the field of electrochemical energy storage.The electrode materials of hybrid capacitors include those electrode materials used in lithium-ion secondary batteries and supercapacitors,contributing to the"cross structure"formed in the hybrid capacitor.(NCM+AC)hybrid-positive and hard carbon-negative electrodes were prepared using dry and wet processes,respectively,and the 064060 flexible packing hybrid capacitors were assembled.The features of the two electrode architectures are extensively examined,as well as their effects on the performance of the flexible packing hybrid capacitor.The findings of the experiments demonstrate that the dry electrode has a lot of PTFE fiber structures and that the particles in the raw material are closer together.Under the same thickness,the dry electrode has higher loading active material,higher volume density,and smaller ohmic and polarization resistances than the wet electrode.In comparison with those of the wet electrode product,the capacity and energy density of the dry electrode product rise by>20%in the same volume of flexible packaging product.Under the condition of the same ratio of positive to negative electrode in areal density and in discharge capacity,the life of high-and low-temperature,cycle,rate charge-discharge,and high-temperature endurance tests of dry electrode products are better than those of wet electrode products.Dry electrode preparation is solventless,environmentally friendly,and cost-effective,and its PTFE fiber can securely connect NCM and AC,making it ideal for hybrid capacitor electrode preparation.

关 键 词：混合型电容器 干法电极 湿法电极 能量密度 极化电阻 

分 类 号：TM911[电气工程—电力电子与电力传动]