Significantly enhanced energy storage performance promoted by ultimate sized ferroelectric BaTiO3 fillers in nanocomposite films
Abstract Polymer nanocomposite that consists of dispersed particle fillers and a flexible polymer matrix shows comprehensive excellent dielectric properties and thus is considered as promising dielectric layers in high-performance energy-storage capacitors. However, the commonly employed high permittivity particle fillers cause inevitable dielectric strength deterioration and seriously impede the energy density and reliability of the nanocomposite. To solve this problem, ultimate sized ferroelectric nanofillers, 6.9nm BaTiO 3 nanocrystals, are introduced into a poly(vinylidene fluoride-co-hexafluoro propylene) (PVDF-HFP) polymer matrix to realize both the high dielectric constant and enhanced breakdown strength. The influence of nanoparticle fraction on the microstructure and dielectric properties of the composite films is investigated. Compared to the polymer-ceramic composites with coarse particle fillers, significantly enhanced breakdown strengths (≥330kV/mm) are observed in the nanocomposite films containing 10–40 vol.% BaTiO 3 nanofillers. In consequence, a maximal discharged energy density of 9.7J/cm 3 is obtained, which confirms that these ultimate sized nanocrystals can perform as superior high permittivity fillers in the nanocomposites for energy storage applications. Highlights For the first time, ultimate sized BaTiO 3 nanocrystals (~6.9nm) serve as fillers of nanocomposite films for energy-storage applications. Significantly high breakdown strengths ( E b ≥330kV/mm between 10–40vol%, E b = 133kV/mm at 80vol%) and enhanced energy density (maximal U dis =9. 9.7J/cm 3 ) are obtained. Graphical abstract PVDF/BT nanocomposite films composed of ultimate sized ferroelectric BaTiO 3 nanocrystals are fabricated by spin-coating of the highly dispersed nanocomposite sol. Remarkable energy storage performance and significant high breakdown strength are obtained in the dense and uniform nanocomposite films containing 10–40 vol.% BT. [DISPLAY OMISSION]
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기