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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Initiating a high-temperature zinc ion battery through a triazolium-based ionic liquid
Xun Li1, Fawen Ning2, Lin Luo2
1College of Physics and Electromechanical Engineering, Jishou University Jishou 416000 China jianhuawu@jsu.edu.cn.
RSC Advances
|April 15, 2022
Summary
New triazolium-based ionic liquids enhance zinc battery performance. These electrolytes offer improved stability and conductivity, showing superior capacity retention and efficiency, especially at high temperatures, outperforming aqueous electrolytes.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Ionic liquids (ILs) are promising electrolytes for advanced energy storage devices.
- Triazolium-based ILs offer tunable properties for electrochemical applications.
- Hydroxyl groups significantly influence IL physicochemical properties, affecting stability and conductivity.
Purpose of the Study:
- To synthesize and characterize novel triazolium-based ionic liquids (T1, T2, T3) with varying hydroxyl group content.
- To investigate the impact of hydroxyl groups on the physicochemical and electrochemical properties of these ILs.
- To evaluate the performance of a selected IL-based electrolyte (T1S-20) in a zinc/lithium vanadium phosphate battery.
Main Methods:
- Cu(I)-catalyzed azide-alkyne click chemistry for IL synthesis.
- Physicochemical property analysis using various technologies.
- Electrochemical characterization, including electrochemical stability windows (ESWs).
- Assembly and testing of a Zn/Li3V2(PO4)3 battery using T1S-20 as the electrolyte at different temperatures.
Main Results:
- Decreasing hydroxyl groups enhanced IL stability and conductivity.
- T1, T2, and T3 exhibited high thermal stability with ESWs of 4.76, 4.11, and 3.52 V, respectively.
- T1S-20 electrolyte showed a conductivity of 1.55 × 10^-3 S cm^-1 and an ESW of 6.36 V at 30 °C.
- The Zn/Li3V2(PO4)3 battery with T1S-20 demonstrated excellent performance, with high capacity retention (89% after 50 cycles at 30 °C, 93.6% after 100 cycles at 80 °C) and Coulombic efficiency (99%).
Conclusions:
- Triazolium-based ionic liquids with tailored hydroxyl group content offer tunable properties for battery electrolytes.
- The T1S-20 electrolyte exhibits superior electrochemical stability and conductivity compared to aqueous electrolytes.
- The developed T1S-20 electrolyte significantly enhances the performance of Zn/Li3V2(PO4)3 batteries, particularly at elevated temperatures.
