An AZOMaterials article highlights a paper in Nature Communications. It is worth noting that the researchers label this storage a "hybrid supercapacitor." Here are a few paragraphs from that article
The hybrid supercapacitor can be charged and discharged as fast as a capacitor and can store nearly as much energy as standard batteries. In contrast to the latter, it can be charged and discharged a lot faster and for more number of times: while the service life of a lithium-ion battery is a few thousand cycles, a supercapacitor can handle about one million charging cycles.
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A specifically sustainable, but hitherto largely uninvestigated variant of such a hybrid supercapacitor comprises carbon and aqueous sodium iodide (NaI) electrolyte, with a negative supercapacitor electrode and a positive battery electrode.
Researchers Demonstrate Viability of Eco-Friendly Supercapacitors
https://www.azom.com/news.aspx?newsID=54747
8 Oct 2020
Prehal, C., et al. (2020) Persistent and reversible solid iodine electrodeposition in nanoporous carbons. Nature Communications. https://doi.org/10.1038/s41467-020-18610-6.
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