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A rechargeable Ca/Cl2 battery
Shitao Geng1, Xiaoju Zhao1, Qiuchen Xu1
1Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, and Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, 200240, Shanghai, China.
Nature Communications
|January 31, 2024
Summary
Researchers developed a new rechargeable calcium-chlorine (Ca/Cl2) battery. This sustainable energy storage solution offers high capacity, excellent retention, and low-temperature performance, overcoming previous limitations in Ca metal batteries.
Area of Science:
- Electrochemistry
- Materials Science
- Sustainable Energy Storage
Background:
- Rechargeable calcium (Ca) metal batteries offer sustainable energy storage due to Ca abundance.
- Current Ca battery limitations include low energy/power densities, poor capacity retention, and limited low-temperature performance.
Purpose of the Study:
- To develop a practical rechargeable Ca metal battery overcoming existing limitations.
- To introduce a novel Ca/Cl2 battery chemistry utilizing a reversible redox reaction.
Main Methods:
- Designed a rechargeable Ca/Cl2 battery system.
- Employed lithium difluoro(oxalate)borate as an electrolyte mediator.
- Investigated the reversible cathode redox reaction between CaCl2 and Cl2.
Main Results:
- Achieved a discharge voltage of 3V.
- Demonstrated remarkable specific capacity (1000 mAh g-1) and rate capability (500 mA g-1).
- Exhibited excellent capacity retention (96.5% after 30 days) and low-temperature performance (down to 0°C).
Conclusions:
- The developed Ca/Cl2 battery addresses key bottlenecks in rechargeable Ca metal batteries.
- This advancement paves the way for high-performance, sustainable calcium-based energy storage.
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