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Nuclear has a better value-adjusted levelized cost of energy. SMRs are very much developing but have been deployed in some areas outside the US.
Sodium ion batteries are great for many reasons but also aren't as energy dense, so you need a way larger footprint. I'm not saying we should only do one of the other, it's all of the above. Also repurposed EVs aren't really a thing at scale, nor does there seem to be that much investment into it from a quick search. The main investment is into full recycling of batteries.
I don’t think you can win the economic argument, everything I’ve seen suggests nuclear is far more expensive and it’s not getting cheaper, whereas renewables are but if you’ve got sources, by all means let’s see them.
Sodium batteries don’t require a way larger footprint, it’s true they’re not quite as energy dense but they’re being used in EVs in China, there’s a little reduction in range for the same size pack but they’re way better in extreme cold and heat so you’re not drawing as much power to condition the battery.
If we’re talking 10-15 years from now, when a new nuclear plant would come online, there’s going to be a lot of EV batteries around. Maybe they get recycled but that seems a waste when they’ve only lost a little capacity. I guess we’ll see.
https://www.iea.org/reports/projected-costs-of-generating-electricity-2020
That's 6 years old and written in conjunction with the NEA.
https://en.wikipedia.org/wiki/Nuclear_Energy_Agency
Still there's this from that report:
In the US, at least nuclear is much more expensive than wind and solar.
Here's last year's figures. Nuclear is crazy expensive.
https://www.lazard.com/research-insights/levelized-cost-of-energyplus-lcoeplus/