储能科学与技术2025，Vol.14Issue(12)：4421-4430,10.DOI:10.19799/j.cnki.2095-4239.2025.0695
基于γ-戊内酯浆料的石墨烯添加剂在锂离子电容器正极中的应用
Application of graphene conductive additives in lithium-ion capacitor cathodes based on γ-valerolactone slurries
摘要
Abstract
In this study,a graphene-enhanced activated carbon cathode slurry system was developed using the eco-friendly solvent γ-valerolactone(GVL).The evolution of electrode microstructure and its impact on electrochemical performance were systematically examined through rheological analysis,scanning electron microscopy,electrochemical impedance spectroscopy,and cyclic voltammetry.The results reveal that GVL offers suitable viscosity and solvation characteristics,ensuring homogeneous dispersion and coating stability of the slurry.Furthermore,the three-dimensional conductive network established by graphene markedly decreases charge-transfer resistance,thereby improving the electrode's rate capability and reaction kinetics.At a current density of 0.1 A/g,the electrode delivered a specific discharge capacity of 77.2 mAh/g—representing a 38%enhancement over commercial activated carbon electrodes(64.7 mAh/g)—and maintained 100%capacity retention after 400 charge-discharge cycles.When coupled with a hard carbon anode in a coin-type lithium-ion capacitor,the assembled device achieved an energy density of 172 Wh/kg and a power density of 6 kW/kg,based on active material mass.This work provides both theoretical insight and experimental validation for the sustainable fabrication of high-performance energy storage electrodes,underscoring their potential in advanced electrochemical systems such as supercapacitors and lithium-ion capacitors.关键词
石墨烯/活性炭正极/γ-戊内酯/绿色浆料/锂离子电容器Key words
graphene/activated carbon cathode/γ-valerolactone/green slurry/lithium-ion capacitor分类
信息技术与安全科学引用本文复制引用
XU Jianwei,WANG Rongrong,LIU Yang,LI Chen,JING Peng,ZHANG Xiong..基于γ-戊内酯浆料的石墨烯添加剂在锂离子电容器正极中的应用[J].储能科学与技术,2025,14(12):4421-4430,10.基金项目
国家自然科学基金(52377218). （52377218）
