A new cathode material for all-solid-state fluoride-ion batteries (FIBs) delivers a reversible capacity of approximately 550 mAh/g. That’s more than double the 120–250 mAh/g typical of lithium-ion cathodes. A Japanese language article in Nikkei reported that the volumetric capacity of a cathode for such fluoride-ion batteries increased by roughly three times that of lithium-ion batteries.…