摘要
纳米导电剂是保证超级电容器高功率的重要辅助材料,但目前广泛应用的导电碳黑对离子传输的通道不足,从而限制其倍率性能的提高。为此,本研究设计并制备了一种中空碳纳米球(HSP)导电剂用于超级电容器研究。通过以苯胺-吡咯共聚物空心球为碳源,简单一步微波高温碳化获得HSP。研究结果表明,高石墨化HSP既具有高电子导电性,同时又可以保存电解液和提供更多的离子运输通道,从而提升电极的电荷传输速率。与商用碳材料一起制备电极,在1~10 A·g^(-1)的电流密度下,比电容达108~98 F·g^(-1),优于导电碳黑制备的电极。此外,基于HSP有机超级电容器具有高能量密度(15.1 Wh·kg^(-1))和高功率密度(10550 W·kg^(-1)),比SP超级电容器的能量和功率密度(6.7 Wh·kg^(-1),7500 W·kg^(-1))分别提高了130%和40%,并保持长的循环稳定性。这些研究结果表明空心化的导电剂HSP作为辅材可以有效增强超级电容器的整体性能。
Nanocarbon conductive additives are important auxiliary materials for ensuring supercapacitors with high power.However,due to the insufficient ion transport channels,carbon black as the widely used conductive additive brings about poor rate capability for supercapacitors.Here,hollow carbon nanospheres(HSP)were prepared and applied as conductive additives for supercapacitors.HSP were obtained by a simple microwave-assisted high-temperature carbonization method with poly(aniline-co-pyrrole)copolymer hollow spheres as carbon precursors.The results showed that highly graphitized HSP not only had high electronic conductivity,but also retained electrolyte and provided more ion transport channels for more facilitating charge transfer of electrodes.As a result,the electrodes based on commercial activated carbons and HSP as conductive additives showed high specific capacitance from 108 to 98 F·g^(-1)at current densities ranging from 1 to 10 A·g^(-1),which was higher than that of conductive carbon black-based electrodes.Furthermore,HSP-based organic supercapacitors demonstrated high energy density(15.1 Wh·kg^(-1))and high power density(10550 W·kg^(-1)),which were 130%and 40%higher than that of conductive carbon black-based supercapacitors(6.7 Wh·kg^(-1),7500 W·kg^(-1)),as well as maintaining excellent cycling performance.These findings indicate that the HSP used as hollow conductive additives could effectively improve the overall performance of supercapacitors.
作者
李永素
易泽军
邵亚欣
李豪翔
李振湖
LI Yongsu;YI Zejun;SHAO Yaxin;LI Haoxiang;LI Zhenhu(Chongqing Jiaotong University,Chongqing 400074,China;Research Center of Electrochemical Energy Storage Technologies,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Chongqing School,University of Chinese Academy of Sciences,Chongqing 400714,China)
出处
《功能材料与器件学报》
CAS
2024年第3期126-133,共8页
Journal of Functional Materials and Devices
基金
中国科学院青年创新促进会(2020380)
关键词
导电剂
电荷传输
中空碳纳米球
超级电容器
Conductive additives
Charge transportation
Hollow carbon nanospheres
Supercapacitor
作者简介
李永素(1996–),女,硕士,学生,主要研究方向为超级电容器纳米碳材料(E-mail:liyongsu21@mails.ucas.ac.cn);通信作者:李振湖,女,博士,副研究员,主要研究方向为超级电容器关键材料与器件(E-mail:lizhenhu@cigit.ac.cn).
