John Goodenough was one of the pioneers...he was based at University at Austin, TX. (died in 2023). One of the theories of why Elon was so eager to relocate to TX also involved him being able to be close to Goodenough research team....
Goodenough had an impressive track record, he won Noble prize for inventing Lithium-ion battery. He also basically invented RAM at MIT.
We shall see if any of this pans out commercially...
My friends in the battery world have said the challenge or obstacle is the anode: graphite, silicon or lithium
Goodenough served in world war 2, greatest generation
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