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August 15 2022

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Experimental chlorine battery has 6 times more charge than lithium ions

Finally rechargeable, finally stable: at Stanford they "solve" the problems of the chlorine battery: a great energy shot.

Gianluca Ricciodi Gianluca Riccio
in Energy
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chlorine battery
August 31 2021
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Scientists at Stanford University have developed a chlorine battery that is not only rechargeable, but offers about six times the capacity of today's lithium-ion solutions. The breakthrough is based on the stabilization of volatile chlorine reactions within the device. It may someday provide the foundation for high-performance batteries that power smartphones, for example, for weeks before running out.

The new battery is described as an alkali metal chlorine battery and is based on a chemistry that first emerged in the 70s called lithium thionyl chloride. These batteries are highly regarded for their high energy density, but they are not rechargeable. They are based on highly reactive chlorine which makes them unsuitable for multiple uses.

Substantial differences

In a normal rechargeable battery, electrons travel from side to side during discharge and then return to their original shape when the battery is recharged. In this case, however, the sodium chloride or lithium chloride is converted to chlorine, which is too reactive to be converted back to chloride with great efficiency.

The authors of this new study may have found a solution to this problem. The team was experimenting with sodium chloride and chlorine to try to improve the performance of this battery, but found that the chemical had indeed stabilized. This provided the battery with some degree of recharging. Subsequent investigation led the team to develop a new porous carbon electrode material that acts like a sponge, absorbing irregular chlorine molecules and safely storing them to be converted back into sodium.

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chlorine battery
An excerpt from the study published in Nature

The chlorine molecule is trapped and protected in the tiny pores of the carbon nanospheres when the battery is charged. So when the battery needs to be discharged or discharged. We can drain the battery and convert the chlorine to make NaCl - table salt - and repeat this process for many cycles. Currently we can pedal up to 200 times and there is still room for improvement. A well-maintained lithium-ion battery, to put it mildly it can fit for 500-1000 cycles.

Guanzhou Zhu, Stanford University

Chlorine battery, high density

Through their experiments, the team also demonstrated a very high energy density for the prototype battery. 1.200 mAh per gram of electrode material, about six times that offered by today's lithium-ion battery technology.

The team envisions the battery could be used in hearing aids or remote controls. It could also power devices that only require infrequent recharges (satellites or remote sensors that could be recharged with solar energy). For use in smartphones and electric vehicles, scientists will need to expand the battery and design a suitable structure. This means first of all increasing the number of times it can be used safely.

Research on the chlorine battery was published in the journal Nature.

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