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We can produce graphene at scale but it's not big uniform layers but small randomly oriented pieces.

Big uniform layers are prohibitively expansive (and you have to provide your substrate to them)

Making particles of it is easy, making sheets is where it is still hard, so that's probably the bit that you're missing.

I assumed they would need sheets of it for batteries, but if it works for them with just particles all the better.

The term is impregmating in this context and process :)

Oh my, I never knew there was a different word for it, thank you!