Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201901884
Keywords
dielectrics; discharged energy density; inkjet printing; microenergy storage device; polymer composites; PVDF latex
Categories
Funding
- Aquitaine Region
- BPIGRAPULE-2 project
- CNRS Energy unit (Cellule Energie) through the project MicroPower
- ANR GAELIC project
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Microenergy storage devices are appealing and highly demanded for diverse miniaturized electronic devices, ranging from microelectromechanical system, robotics, to sensing microsystems and wearable electronics. However, making high-energy microcapacitors with currently available printing technologies remains challenging. Herein, the possibility to use latex polyvinylidene fluoride (PVDF) as aqueous ink for making dielectric capacitors at the microscale is shown. The dielectric properties of printed microcapacitors can be optimized based on a novel approach, i.e., mixing PVDF latex with polyvinyl alcohol (PVA) to realize dielectric organic nanocomposites. The PVA prevents the coalescence of PVDF nanoparticles and serves as a continuous matrix phase with high dielectric breakdown strength. While the well-dispersed PVDF nanoparticles serve as highly polarizable and isolated domains, providing large electric displacement under high fields. Consequently, a high discharged energy density of 12 J cm(-3) is achieved at 550 MV m(-1). These printed microcapacitors demonstrate mechanical robustness and dielectric stability over time.
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