Discussion on Operational Voltage and Efficiencies of Ionic-Liquid-Based Electrochemical Capacitors

被引：24

作者：

Santos, Mayara C. G. ^{[1
]}

Silva, Glaura G. ^{[1
]}

Santamaria, Ricardo ^{[3
]}

Ortega, Paulo F. R. ^{[2
]}

Lavall, Rodrigo L. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Quim ICEx, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil

[2] Ctr Fed Educ Tecnol Minas Gerais, Dept Quim, Av Amazonas 5253, BR-30421516 Belo Horizonte, MG, Brazil

[3] CSIC, Inst Nacl Carbon, INCAR, Apdo 73, Oviedo 33080, Spain

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 14期

关键词：

ELECTRICAL DOUBLE-LAYER; STABILITY LIMITS; SOLID-STATE; ELECTROLYTE; SUPERCAPACITORS; GRAPHENE; ENERGY; QUANTIFICATION; PERFORMANCE; SIZE;

D O I：

10.1021/acs.jpcc.8b11607

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this article, we explore electrical double-layer capacitors (EDLCs) based on ionic liquids (IL), focusing on their stability and efficiencies (Coulombic and energetic). We analyze the conventional voltammetric methods to determine the electrochemical stability window, pointing out that a simple analysis of Coulombic efficiency, under different current and voltage conditions in galvanostatic experiments, has the advantage of being more representative for real cells, especially when studied together with energy efficiency. In addition, we study how IL-based EDLCs differ from aqueous and organic ones in terms of energy efficiency correlating with the physicochemical properties of electrolytes. Finally, we discuss the high resistance of this type of EDLC that has a detrimental effect on energy efficiency and cycling performance, even when the Coulombic efficiency is close to 100%.

引用

页码：8541 / 8549

页数：9

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