Traditional
dielectric polymers are nonbiodegradable and nonrenewable
petroleum-derived synthetic ones. Here, we report on flexible and
2D nanolayer-structured nanocomposite dielectric films which are easily
fabricated from aqueous NaOH/urea solutions of biodegradable and renewable
cellulose and boron nitride. Cellulose molecules serve as a stabilizer
for exfoliated boron nitride nanosheet (BNNS) and provide the nanocomposites
with a high dielectric constant, while BNNS significantly improves
their breakdown voltage. Here, 10 wt % of BNNS in the nanocomposite
leads to a film with energy storage density of 4.1 J cm–3 and breakdown voltage of 370 MV m–1. The energy
storage density is much higher than that of any commercial dielectric
polymer as well as any biomass-based materials reported in the literature.
Concurrently, these nanocomposites possess high thermal conductivity
of 2.97 W m–1 K–1 and excellent
thermal stability of dielectric properties. This work provides a new
route toward fabricating environmentally friendly biomass-based thermally
stable dielectric energy storage devices.
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