Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

Dielectric materials with high dielectric constant, lowloss tangent,and lower cost need to be developed, given the growing demand foradvanced electronic devices and energy systems. We present the firstattempt to use a renewable lignin-derived graphene-like (LG) fillerprepared by a simple, low-cost, and scalable approach to enhance thedielectric properties of polyvinylidene fluoride (PVDF)-based nanocomposite.LG/PVDF nanocomposites were fabricated via simple blending and solvent-castingmethods. The LG/PVDF nanocomposites outperform previously publishedresearch utilizing conventional graphene filler, with a low percolationthreshold f (c) = 0.09. At room temperatureand 1 kHz, the nanocomposite with the volume fraction of LG filler f (LG) = 0.08 exhibits a high dielectric constantvalue of 107, which is & SIM;12 times higher than pure PVDF whileretaining a low loss tangent of 0.06. The main mechanisms for theexcellent dielectric properties were proposed to be related to theMaxwell-Wagner-Sillars (MWS) polarization of the LGfiller and the formation of local microcapacitor structure. This workcould pave the way for the next generation of environmentally friendlydielectrics with exceptional dielectric characteristics for high-performanceenergy storage devices by composing renewable graphene and polymercomposite systems and opening critical roadblocks to superior dielectricperformance of percolative materials.