news.harvard.eduResearchers design long-lasting, solid-state lithium batteryHarvard researchers have designed a stable, lithium-metal, solid-state battery that is far more efficient than lithium-ion batteries.
https://insideevs.com/news/443450/ex-tesla-solid-state-batteries-false-hope/
https://www.youtube.com/watch?v=6w78-aSTIDY
more hope for lithium ion