A study funded by Tesla revealed that batteries with single-crystal electrodes could power EVs for 5 million miles

https://www.republicworld.com/tech/are-single-crystal-electrodes-the-future-of-lithium-ion-batteries-in-evs

"lithium-ion battery with this new type of electrode charging/ discharging repeatedly 20K times (6 years) retains 80% original capacity... can be cycled 8X longer than regular lithium-ion battery, equivalent to EV driving 5 million miles... placed long-lasting single-crystal electrode with a more commonly utilized polycrystalline electrode... after 2.5 years constant cycling, polycrystalline electrode full of tiny cracks limiting storage"

Related: 5 million miles: Breakthrough EV battery breaks record range, lasts over 20,000 cycles
https://www.yahoo.com/news/5-million-miles-breakthrough-ev-131519061.html