Naturally-conductive chromium selenide cathode in this potassium-ion battery achieves high performance

https://www.gla.ac.uk/news/headline_1122851_en.html

"high performance cathode despite <10% carbon, rapid charging, cheaper/ easier manufacture... 125 mAh per gram, close to 127 maximum theoretical capacity... layered nature of the material allows potassium ions to travel more easily between the layers during charge and discharge, allows the battery to maintain 85% of its capacity in lab conditions even when charged and discharged at high speed...stationary storage... future: identify an electrolyte delivering improved performance in future refinements of the battery’s design"