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Sustainable Batteries Made with Apples

These batteries are far more powerful than nickel-metal hydride, and could be an alternative to lithium-ion technology.

The new carbon-based material for sodium-ion batteries can be extracted from apples.
The new carbon-based material for sodium-ion batteries can be extracted from apples.

A carbon-based active material produced from apple leftovers and a material of layered oxides might help reduce the costs of future energy storage systems.

Both were found to have excellent electrochemical properties and stand for the environmentally compatible and sustainable use of resources.

Now, these materials are presented by Karlsruhe Institute of Technology (KIT) researchers in ChemElectroChem and Advanced Energy Materials.

Sodium-ion batteries are not only far more powerful than nickel-metal hydride or lead acid accumulators, but also represent an alternative to lithium-ion technology, as the initial materials needed are highly abundant, easily accessible, and available at low cost.

Hence, sodium-ion batteries are a very promising technology for stationary energy storage systems that play a central role in the transformation of the energy system and will be a highly attractive market in the future.

Now, Professor Stefano Passerini and Dr. Daniel Buchholz of KIT's Helmholtz Institute have made an important step towards the development of active materials for sodium-based energy storage systems.

For the negative electrode, a carbon-based material was developed, which can be produced from the leftovers of apples and possesses excellent electrochemical properties.

So far, more than 1,000 charge and discharge cycles of high cyclic stability and high capacity have been demonstrated. This discovery represents an important step towards the sustainable use and exploitation of resources, such as organic waste.

The material developed for the positive electrode consists of several layers of sodium oxides. This active material goes without the expensive and environmentally hazardous element cobalt that is frequently used in active materials of commercial lithium-ion batteries.

At the lab, the new active material, in which electrochemical energy storage proper takes place, reaches the same efficiency, cyclic stability, capacity, and voltage without any cobalt.

Both materials mark an important step towards the development of inexpensive and environmentally friendly sodium-ion batteries.

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