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Why? The materials needed for LiFePO4 batteries are very common, and we only need a few dozen large factories and refineries.

Compared to the size of the fossil fuel extraction industry, it's tiny.

The only question is how quickly we can build up to the scale needed, not if we can.

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Phosphorus is essential to growing food and shortages have already begun.

There's no shortage of phosphorus. As prices go up extraction from human waste becomes profitable and all municipalities just do it. We invest in closed loop systems we stop having to think about energy and agricultural inputs as extractive, there is minimal possibility of "shortage" it's just a closed-loop system that occasionally needs to be topped off a bit.

You don't "just do" anything on that scale.

But you do them.

We have a shortage of refined Lithium and Phosphate. We have no shortage of the unrefined elements in profitable concentrations.

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