We don't follow the industry that much here at Premium, as most of the companies are pre-revenue, highly speculative options. However, the two you may want to keep an eye on moving forward are Allkem (AKE) and Lithium Americas (LAC).
Allkem was a merger of Orocobre and Galaxy. It is not a pure play lithium company but it does have lithium assets. This is a rare lithium play that is generating revenue and cash flow. It has a strong balance sheet and you could call it one of the "safer" lithium plays, if that exists.
Lithium Americas of the other hand is pre revenue. You're investing in the potential of this company's assets. It has 3 facilities total, and is currently on its way to getting production out of all 3. 2 are in Argentina and one is in the United States. Its Thacker Pass (the one in the United States) mine has a ton of potential, and is one of the primary drivers for investors interests.
LAC is going to be wildly volatile. Cost increases during construction, delays, etc can put a ton of pressure on the share price. The reverse is also true. Better than expected costs, earlier than anticipated production etc can cause share prices to soar. This is your typical pre-revenue exploration/development company. It is trading at a little more than 10x its expected sales next year.
These are two companies I'd be adding to a watchlist if I'm interested in the segment. Anything else here in Canada is wildly speculative. Some of them have a lot of promise, but for me personally, just way too risky.