I wrote a section in my investing journal a few weeks ago about Lithium. There is an ETF - LIT - you do need to dig a little into what the holdings are to find the pure plays. I would add to this a new thought - where Lithium goes Cobalt will follow.

https://steemit.com/investing/@carrinm/tib-today-i-bought-and-sold-an-investors-journal-10-aegon-insurance-us-banks-lithium-and-usd