RMIT researchers claim that the proton batteries could be mass produced by 2023. This new breed of batteries is carbon-based, but the energy storing process is totally eco-friendly and also has reduced production costs. The Australian researchers are currently trying to increase the overall efficiency above what Lithium-ion batteries can offer.
https://www.notebookcheck.net/Proton-batteries-could-soon-replace-Lithium-ion-ones.288986.0.html