In this video Brain and Bradford discuss whether battery cells or Silicon Carbide could be the factor slowing up the Megapack ramp:-
The recent decision to build a factory in the US to make CATL LFP cells implies cells may be the limiting factor for now.
If we consider the mission, 20 million vehicles by 2003 and 1 TWh of energy storage batteries, might add up to a lot of Silicon Carbide.
The Jeff Dahn team has done some early stage research on a battery which uses Silicon Carbide it is a "great" battery but does have some "issues". We are not going to see a battery using Silicon Carbide before 2030, if we see it at all.
I've had a hunch for sometime that Tesla may eventually make their own Silicon Carbide.
If the only issue is cells then in most locations CATL LFP equipment can be used to make the cells. Ideally CATL builds and operates the factory, but in some situations as per the US. Tesla may need to do it.
In India my hunch is Tesla may need to work with a local Indian cell supply, and perhaps use Sodium-Ion batteries.
The edge that Tesla has is in power electronics and software.
For energy storage I think the preference is that others build the factories to make the cells. Building a battery factory is a step beyond building a Megapack factory in terms of capex, timeframe, staff and raw materials requirements.
Should Tesla need to build a Silicon Carbide factory, they will only need 1 for worldwide supply, probably located in North America. I hope they are at least doing some "stealth mode" R&D on that.