Very few lithium vehicle batteries have reached the end of their life cycle yet, so the technology to recycle them has barely started to develop.

The recycling of small lithium batteries is a well-established industry, it is either converted to lithium carbonate or dissolved to make it non-reactive and then used for other purposes. I don't believe it is similar to nuclear waste.

Also, there's only a small quantity of lithium in a lithium battery, approximately 100-200g per kWh of battery capacity.