You're giving the price of lithium carbonate, not lithium. Li is only 18.7% of LiCO3.
Your graphs show it. They also show that there has not been a substantial reduction in its price over the years.
This means there is market potential for other (al/sodium) chemistries, mainly for grid-level storage.
Electric cars (by far the biggest consumer of lithium) have been experiencing a an average compounded growth of something like 50% per year for the past 10 years. Li production is still catching up. The earth has plenty of Li deposits but there is a lead time to purchase the heavy machines needed to turn those deposits into productive mines.
Once electric car growth hits the inflection point on the adoption curve, and growth becomes sub-exponential, we'll start to see major downward pressure on Li prices.