If you want to invest in the coming lithium trend, why not sidestep everyone else and invest in cobalt instead.
Cobalt is needed just as much as lithium in the production of ION batteries:
I would invest in a company with a great deal of lithium exposure - glencore.
According to a recent bloomberg article, Glencore produces almost a third of the world’s cobalt which it mines in the democratic republic of Congo.
Glencore is an absolute monster and investors could benefit from their scale. They will not be as nimble as other companies, but at least you can see how they have fared over the past few years.