They will be recycled by Tesla. Tesla has a partnership with the co-founder of Tesla who departed to form his own battery recycling plant. Cheaper for them to recycle batteries than to mine fresh ore. No other car company is doing recycling of electric car batteries.
While the cost of fully recycling a lithium-ion battery is about 1 per kilogram, the value of the raw minerals reclaimed from the process is only about a third of that.Another way to look at the cost of extraction of lithium from old batteries is that it is 5 times more expensive than mined lithium. https://www.instituteforenergyresearch.org/renewable/the-afterlife-of-electric-vehicles-battery-recycling-and-repurposing/