December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
EN06.06.08

Investigation of Choline Bromide-Based Electrolyte For High Performance Supercapacitors

When and Where

Dec 4, 2024
8:00pm - 10:00pm
Hynes, Level 1, Hall A

Presenter(s)

Co-Author(s)

Vladimir Vladimir1,Zhanibek Ayaganov1,Annie Ng2

Institute of Combustion Problems1,Nazarbayev University2

Abstract

Vladimir Vladimir1,Zhanibek Ayaganov1,Annie Ng2

Institute of Combustion Problems1,Nazarbayev University2
Choline bromide (ChBr) has been less explored as an electrolyte material. This work demonstrates the promising potential of ChBr as a novel eco-friendly aqueous electrolyte for hybrid supercapacitors. At its optimized concentration of 3.5 M, the ChBr solution exhibits a maximum conductivity of 79.56 mS cm<sup>-1</sup> at the room temperature, along with a viscosity of 3.15 mPas and a density of 1.14 g cm<sup>-3</sup>. A reduction in water activity of the optimized ChBr electrolyte concentration extends the electrochemical stability window (ESW), enabling operation up to 1.9 V for two-electrode cells. When the current densities increase from 0.5 to 5 A g<sup>-1</sup>, the hybrid supercapacitor based on ChBr electrolyte with the optimized mass ratio of electrodes composed of commercial microporous carbon (Maxsorb) demonstrates impressive specific energy and capacitance retention from 41 to 36 Wh kg<sup>-1</sup> and from 330 to 300 F g<sup>-1</sup> (per mass of one electrode), respectively. These performance parameters are highly competitive with hybrid devices based on organic electrolytes. The experimental results obtained from this work demonstrate possibilities for further development and applications of ChBr-based hybrid systems in energy storage devices.

Keywords

Br | electrical properties

Symposium Organizers

Patrick Cappillino, University of Massachusetts Dartmouth
Aaron Hollas, Pacific Northwest National Laboratory
Pan Wang, Westlake University
Xiaoliang Wei, Purdue University

Symposium Support

Silver
Neware Technology LLC Bronze
Zhejiang ERG Energy Co., Ltd.

Session Chairs

Patrick Cappillino
Xiaoliang Wei

In this Session