2D‐Nanofiller‐Based Polymer Nanocomposites for Capacitive Energy Storage Applications

High-energy-density storage devices play a major role in modern electronics from traditional lithium-ion batteries to supercapacitors for variety of applications rechargeable advanced military equipment. Despite the mass adoption polymer capacitors, their application is limited by low energy densities and low-temperature tolerance. Polymer nanocomposites based on 2D nanomaterials have superior capacitive densities, higher thermal stabilities, mechanical strength as compared pristine polymers 0D or 1D nanomaterials, thus making them ideal high-energy-density dielectric applications. Here, recent advances 2D-nanomaterial-based implications are reviewed. Nanocomposites conducting nanofillers such graphene, reduced graphene oxide, MXenes, semiconducting including transition metal dichalcogenides MoS2, hBN, Mica, Al2O3, TiO2, Ca2Nb3O10 MMT, effects permittivity, strength, density, efficiency, stability, discussed. Also, theory machine-learning-guided design nanomaterial composites learnt challenges opportunities developing ultrahigh-capacitive-energy-density these nanofiller presented.