How about we don't bother with either fission or wind and solar? Just build fusion plants and be done with it. If we're comfortable betting trillions of dollars in infrastructure projects on the hopes that a heretofore unproven technology will pan out, let's be more ambitious than batteries!
Of course, there's no guarantee that any of those fission ideas will actually pan out. Likewise with these battery chemistries. Investing loads of money into intermittent sources with just the hope that some future battery chemistry will solve storage at grid scale is not what I'd call a wise plan.
> heretofore unproven technology
Battery technology seems like a proven technology to me?
You don't seem to understand that batteries are a well proven technology being deployed on a massive scale today. This is not news, this is old:
https://www.eia.gov/todayinenergy/detail.php?id=67205
Anybody who over the past few decades has been saying that we could not deploy batteries on a massive scale needs to reevaluate their bad assumptions, because they are wrong, and moreover we should not trust any of their current assessments until they can reconcile what they got wrong. The tech curves of batteries have been clear for decades, this tech development should not have been unexpected.