Composite design of two-dimensional inorganic nanosheets for flexible energy storage capacitors

We present a new approach for designing flexible energy storage capacitors using two-dimensional (2D) inor-ganic nanosheets. 2D dielectric Ca2Nb3O10 nanosheet and ferroelectric poly(vinylidene fluoride) (PVDF) were selected as model material systems. Langmuir-Blodgett deposition was utilized for layer-by-layer engineering of (Ca2Nb3O10/PVDF) nanocomposite films on an indium tin oxide (ITO)-coated polyethylene terephthalate (PET) substrate. Such a new composite design realized the simultaneous improvement of energy density (37 J cm13) and efficiency (378 %) even in the ultrathin form (320 nm) on the ITO-coated PET substrate. Nanosheet-based flexible capacitors also maintained a stable performance even after 104 times bending cycles. These results indi-cate that our nanosheet approach is of technological importance for exploring new flexible dielectric capacitors.(c) 2023 The Ceramic Society of Japan. All rights reserved.