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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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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
PubMed
Summary
This summary is machine-generated.

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.

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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.