No, Tesla is actually not using Composite Nano particles.
They are using micro particles that are coated with a polymer and then mixed with graphite and a binder.
This is quite different. In that version you contain the silicon expansion not by having complex composite particle but rather by having the polymer contain the cracking.
Sila on the other hand is creating a more complex silicon particle that is partly empty and can expand without cracking. They have not released a picture, but Talga resources has a silicon composite product and they have a picture:
They are using micro particles that are coated with a polymer and then mixed with graphite and a binder.
This is quite different. In that version you contain the silicon expansion not by having complex composite particle but rather by having the polymer contain the cracking.
See this image: https://youtu.be/YTW_Q63bEEY?t=929
Sila on the other hand is creating a more complex silicon particle that is partly empty and can expand without cracking. They have not released a picture, but Talga resources has a silicon composite product and they have a picture:
See this: https://youtu.be/WeTAC6Xe4Uw?t=1557
In general Limiting Factor on yt has by far the best videos on this:
#5 The Science Behind Tesla Silicon - https://www.youtube.com/watch?v=YTW_Q63bEEY
#7 Tesla Silicon is Disrupting Silicon Disruption - https://www.youtube.com/watch?v=AL6xp4fLdFw
He also has the interview with Talga about their Si product:
Mark Thompson - Talga https://youtu.be/WeTAC6Xe4Uw?t=1506
And also with interview with Sinanode:
Sinanode: Low Cost Silicon Nanowire Coated Graphite for OEMs - https://www.youtube.com/watch?v=ySCFZIWMYQA
There is also :
Professor Shirley Meng: The Future of the Anode (C, Si, Li) - https://www.youtube.com/watch?v=0ktsgwzUh3A