It should be pointed out that the environmental impact of mining the precious metals for ev batteries is significant. I've yet to see a comparison on the energy/CO2 needed to create an EV vs an ICE vehicle, but I expect the EV is a lot worse for the planet to produce in the first place. I remember hearing something years ago that it creates as much pollution to build a car than it will generate in its entire life of running... Though I have no idea whether this is accurate or not
That's the thing, there's all sorts of FUD going round, promoted by those car manufacturers who are struggling to adapt to the future. For instance, what you are half-remembering may well be the "independent" report that got some attention a while back - but was later found to be produced by the wife of the head of PR at Aston Martin!!!
The numbers depend a lot on the assumptions you make, but one of the obvious howlers made by the pro-ICE people is assuming that all cars will be run on German electricity with current levels of coal, when they are greening rapidly (never mind the likes of France or the UK where electricity has much lower carbon intensity), you need to look at the source of electricity over the lifetime of the car and not just at present.
Try
this report from one of the leading academics on the subject who comes up with numbers between 11-30,000km depending on what cars you're comparing, he usually cites 16,000 miles as the breakeven point for the "average" car. And crucially he shows how he comes to those numbers, unlike most people, so you can take a view on his assumptions.
- eg people are now scraping ocean floors looking for Lithium
No they are not.
Lithium is highly soluble, the last place you will find it is under water (other than dissolved in the water itself). Quite the opposite, it's found in the most arid places on earth, like the Australian desert.
People are looking underwater for things like nickel (used in stainless steel and 10p coins, if you have an ecological objection to those), but we're in the very early stages of commercial extraction.
But in general, extracting the material for 0.3 tons of battery has rather less impact than extracting the 15 tons of oil needed to run an ICE car in its lifetime.