I tried an inorganic nanosheet but my wife said it made her legs itch. So we went back to cotton.
The neatest applications for these new high energy density materials is for bombs.
When you start the storing of any form of potential energy with an energy density on par with fossil fuels or greater, they can burn or explode- just like those other forms of energy.
And they can be more unstable.
Just ask Boeing about their Lithium Ion Batteries on 787.