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In order to seek sustainable energy storage, researchers from Chalms University of Technology in Sweden have proposed a new concept of applying graphene to sustainable sodium ion batteries, resulting in a capacity increase of ten times compared to traditional sodium ion batteries.

At the current level of performance, sodium ion batteries cannot compete with lithium batteries. One reason is that sodium ions are larger than lithium ions and cannot fuse well with graphite electrodes composed of graphene stacked layers. Therefore, they cannot be effectively stored in the graphite structure.

To address this issue, researchers from Chalms University of Technology in Sweden have developed a Janus graphene with a unique structure. They added molecular spacers on one side of the graphene layer. When they are stacked together, molecules promote the mutual use between graphene sheets and create greater space, significantly increasing capacity.

This new type of graphene has asymmetric chemical functions on opposite surfaces, hence it is called "double-sided graphene" and named after the ancient Roman god Janus.

Normally, the capacity of sodium intercalation in standard graphite is about 35mAh/g, which is less than one tenth of the lithium ion intercalation capacity in graphite. Using new graphene, the capacity of sodium ions is 332mAh/g, which is close to the lithium capacity in graphite.

Our Janus material is still far from industrial applications, but new results suggest that we can design ultra-thin graphene sheets and the small spaces between them to achieve high capacity energy storage, "said Vincenzo Palermo, an associate professor at the Department of Industry and Materials Science at Chalmers University

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