Battery anodes from crab shells. Free Technical Library News

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Crab shell battery anodes

27.03.2023

A group of researchers from Japan and China have proposed using crustacean shells as an alternative to lithium-ion batteries. The technology they created makes it possible to make a carbon anode for sodium-based rechargeable batteries from shells.

To make their "crab carbon," the researchers heated crustacean shells to temperatures in excess of 500 degrees Celsius. After that, they added the resulting carbon to a solution of either tin sulfide or iron sulfide and then dried them to form anodes. The porous fibrous structure of crab carbon provides a huge surface area, which increases the material's conductivity and excellent sodium ion transport.

Traditional modern batteries use a lithium-ion structure. It has proven itself well, but lithium is a rather rare and expensive metal. Alternatively, different laboratories are working on the production of sodium-ion batteries. Although chemically similar to lithium, sodium ions are larger and therefore incompatible with the anode of a lithium-ion battery, usually made of graphite.

The crab-derived carbon made it possible to create a cellular, fibrous anode with a high surface area that improved conductivity and the ability to transport sodium ions. The researchers showed that in the battery model, both tin and iron composites demonstrate the ability to recharge for at least 200 cycles. Although this is even less than that of lithium batteries, this is a big breakthrough for alternative technology.

The researchers note that crab shells, which are formed as waste products from the food industry, are sufficient for production. An increase in production is not required.

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