From all I have read, lithium supply does not seem to be a major concern [1]. But if your numbers are correct, note that the currently mined lithium reservers are 14,000,000 tonnes [2]. 1 tonne lithium then gives you 10MWh of capacity. So 140PWh sounds like a lot of capacity, and this assumes we just stick to places that are currently minded and don't explore alternatives like extraction from seawater [3].