What do you mean with 'this'? You mean silicon anodes ad additives?
Just to start with, silicon has almost the a very high theoretical potential for an anode. Almost as high as lithium metal.
Its not new, current a standard Tesla likely already have 5% silicon oxide in the anode. But to compete with what QS is planning you will needed higher % and likely a different form of silicon.
Every large battery is working on silicon, it makes the battery cheaper and increases density. There are also a huge number of silicon startups.
One example that is comparable to QS is Sila Nanotechnology. silanano.com
Tesla is investing massively in silicon as well. They bought a number startups and doing a lot of development.
I would suggest this playlist (just the silicon parts if you want):
On the same channel you can also find videos on QuantumScape that are very well researched.
But just to be clear, I don't think its a 'scam'. I just think their valuation went insane for a company many years away from actually selling anything and huge investments to be made with large tech risk.
Feel similarly abt QS, lot of potential, but not yet actualized, and valuation ahead of itself - and, damn, I want to get my hands on some of their solid state batteries at 500Wh/kg!
