离子液体
超级电容器
电解质
功率密度
材料科学
电容
电化学窗口
化学工程
离子电导率
离子
电化学
化学
电极
热力学
物理化学
功率(物理)
有机化学
物理
工程类
催化作用
作者
Xinglin Jiang,Xinzheng Wu,Yongbing Xie,Zixing Wang,Junfeng Huang,Yuanxiao Qu,Dali Mu,Xiong Zhang,Weiqing Yang,Haitao Zhang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2023-03-30
卷期号:11 (14): 5685-5695
被引量:11
标识
DOI:10.1021/acssuschemeng.3c00213
摘要
Ionic liquid (IL) electrolytes with a high potential window are promising candidates to high-energy-density supercapacitors; however, they commonly suffer from serious kinetic barriers that lead to poor power density. In this work, we propose an additive engineering method to promote rapid dynamics of IL-based supercapacitors. Additive engineering is based on adding cetyltrimethylammonium bromide-grafted Ti3C2 MXene (Ti3C2-CTAB) into 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), a typical IL electrolyte for supercapacitors. Remarkably, IL electrolytes show a considerable increase by 38% in ionic conductivity and great reduction in solid–liquid surface energy from 18.03 to 12.37 mN m–1. We prove that electrostatic force and hydrogen bonds generated from the interaction between Ti3C2-CTAB and EMIMBF4 facilitate considerable dissociation of electrolyte ion pairs and ion-transfer capability. Consequently, additive engineering-designed IL-based supercapacitors deliver simultaneously a high energy density of 28.3 Wh kg–1 and power density of 18.3 kW kg–1. The increased high-power characteristics are supported by a faster ion diffusion coefficient (1.50 × 10–12 vs 4.04 × 10–13 cm2 s–1) and shorter relaxation time (3.83 vs 6.81 s). In addition, additive engineering guarantees a stable cycling life of 83.6% capacitance retention after 9000 cycles at the depth potential window from 0 to 3.0 V.
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