The impact of carbonate solvents on the self-discharge, thermal stability and performance retention of high voltage electrochemical double layer capacitors

Abstract

Advanced electrolytes for supercapacitors with high electrochemical stability are necessary to improve the suitability of supercapacitors for many applications.

Design and Use of a Novel In Situ Simultaneous Thermal Analysis Cell for an Accurate “Real Time” Monitoring of the Heat and Weight Changes Occurring in Electrochemical Capacitors

“…Furthermore, by measuring the mass change of the active material (carbon + electrolyte), gas development and degradation rates within these devices can be also extrapolated. [ 29 ] In the first part of the manuscript the design of the cell is considered in detail, whereas in the second part, the in situ STA cell is used to investigate the impact of high operating voltage on the stability of EDLCs.…”

High Performance Supercapacitors Based on Mesopore Structured Multiwalled Carbon Nanotubes

“…Thus, acquiring high-performance EDLC would require that electrode materials have high specific surface area and well-controlled structure. [8][9][10] Due to their extraordinary conductivity, fine corrosion resistance, high temperature stability, mechanical and electrochemical capabilities, carbon nanotubes (CNTs) are considered an ideal choice for electrods in electric double layer capacitors (ECs). [11][12][13] Nevertheless, there are many factors impede potential applications of CNTs as electrode structure for ECs.…”

“…Their energy storing process is a physical process based on the formation of a double‐layer formation occurring at the surface of the electrodes. Thus, acquiring high‐performance EDLC would require that electrode materials have high specific surface area and well‐controlled structure [8–10] . Due to their extraordinary conductivity, fine corrosion resistance, high temperature stability, mechanical and electrochemical capabilities, carbon nanotubes (CNTs) are considered an ideal choice for electrods in electric double layer capacitors (ECs) [11–13] .…”

Investigation of Self‐Discharge Behavior on Electrical Double‐Layer Capacitors by Hybrid Mechanism Simulation

“…SD refers to the spontaneous voltage decay across the capacitor that occurs when the capacitor is left unconnected to either a charging circuit or an electrical load after being charged, which determines the energy storage time and has become one of the challenges of the applications of EDLCs. [14][15][16][17] It is the characteristic of EDLCs, which exists even after one charge process and is different from the long-time failure mode in the aging test.To date, most of the investigations are focused on the factors and the methods to suppress the SD process of EDLCs, including the research on the component, the type and the preparative technique of electrolyte, [18][19][20][21][22] separator, [23][24][25][26][27] and AC, [28][29][30][31][32] while the studies discussing the mechanism behind the SD process are limited. Conway et al [33] proposed three kinds of SD models originally: activation-controlled faradaic process, ohmic leakage process, and diffusion control process.…”

“…To date, most of the investigations are focused on the factors and the methods to suppress the SD process of EDLCs, including the research on the component, the type and the preparative technique of electrolyte, [18][19][20][21][22] separator, [23][24][25][26][27] and AC, [28][29][30][31][32] while the studies discussing the mechanism behind the SD process are limited. Conway et al [33] proposed three kinds of SD models originally: activation-controlled faradaic process, ohmic leakage process, and diffusion control process.…”