While it has slowed down, in chipmaking, chips are continually getting smaller. That's what I spend a good part of every day on. I had mentioned that previously, our office handled battery technology patents, and we also handled catalytic converter technology for gasoline, diesel and stationary engines. We don't do either of those now, but would guess there is a lot more activity in battery technology than engine emissions.I think we can and will, but there's a limit. There's also a practicality issues, cost, and scalability.
A good example would be anode material. Graphite is the current choice despite the fact that a silicon anode would increase capacity by at least 2X. Silicon is unstable and degrades quickly when charged/discharged. There is a push to increase the silicon content of anodes. Thermal management of batteries is another area that can and should improve over time.