The British firm Nyobolt (relying on Cambridge University battery scientist Clare Grey) recently demonstrated a mockup vehicle (see photo; car made by a different company) that was able to charge from 10% to 80% charge state in 4 minutes, 37 sec. A constant current of 500 A (800 V, supplied by a 350-kw fast charger) for 4 minutes provided the bulk of the charge (yielding 120 miles of the vehicle’s 155 miles range when charged to 100%; a vehicle with roughly the efficiency of a Model 3). A third party verified that these particular cells retain 80% of their original capacity after 4000 complete fast-charge/discharge (0 to 100%) cycles (www.autoevolution.com/news/nyobolt-s-cells-are-closer-to-production-than-we-could-imagine-238458.html).
In the illustrated mockup vehicle (no production of the vehicle is planned), this number of charge cycles would suffice to propel the car for > 600,000 miles. Nyobolt’s primary chemical claim to fame is use of niobium tungsten oxide anodes, which have been tested to provide > 25,000 charge cycles, equivalent to roughly 4 million miles in the mockup vehicle, but there is no claim by Nyobolt that they intend to manufacture EV batteries with a niobium anode (such batteries are too expensive, and niobium is mined in insufficient quantities for such a product). Most industry insiders do not believe niobium anodes are scalable for EV mass adoption ((Kudos to Chris Calwell for bringing this battery development to my attention.)
