Dr. Haixiong Tang Profile

Dr. Haixiong Tang

at Univ of Florida

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Proceedings Article | 3 April 2013 Paper

Ultra high energy density and fast discharge nanocomposite capacitors

Haixiong Tang, Henry Sodano

Proceedings Volume 8689, 868902 (2013) https://doi.org/10.1117/12.2009361

KEYWORDS: Nanocomposites, Ferroelectric polymers, Capacitors, Dielectrics, Polymers, Ceramics, Barium, Composites, Strontium, Nanowires

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Nanocomposites containing high dielectric permittivity ceramics embedded in high breakdown strength polymers are currently of considerable interest as a solution for the development of high energy density capacitors. However, the improvement of dielectric permittivity comes at expense of the breakdown strength leading to limit the final energy density. Here, an ultra-high energy density nanocomposite was fabricated based on high aspect ratio barium strontium titanate nanowires. The pyroelectric phase Ba_0.2Sr_0.8TiO₃ was chosen for the nanowires combined with quenched PVDF to fabricate high energy density nanocomposite. The energy density with 7.5% Ba_0.2Sr_0.8TiO₃ nanowires reached 14.86 J/cc at 450 MV/m, which represented a 42.9% increase in comparison to the PVDF with an energy density of 10.4 J/cc at the same electric field. The capacitors have 1138% greater than higher energy density than commercial biaxial oriented polypropylene capacitors (1.2 J/cc at 640). These results demonstrate that the high aspect ratio nanowires can be used to produce nanocomposite capacitors with greater performance than the neat polymers thus providing a novel process for the development of future pulsed-power capacitors.

Proceedings Article | 28 March 2012 Paper

Ultra high energy density nanocomposite capacitors using surface-functionalized BaTiO3 nanowires and PVDF-TrFE-CFE

Haixiong Tang, Yirong Lin, Henry Sodano

Proceedings Volume 8342, 834206 (2012) https://doi.org/10.1117/12.917390

KEYWORDS: Nanocomposites, Ferroelectric materials, Dielectrics, Capacitors, Polymers, Dielectric polarization, Nanoparticles, Composites, Sodium, Nanowires

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High energy density capacitors are critically important in advanced electronic devices and electric power systems due to their reduced weight, size and cost to meet desired applications. Nanocomposites hold strong potential for increased performance, however, the energy density of most nanocomposites is still low compared to commercial capacitors and neat polymers. Here, high energy density nanocomposite capacitors are fabricated using surface-functionalized high aspect ratio barium titanate (BaTiO₃) nanowires (NWs) in a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) matrix. These nanocomposites have 63.5% higher dielectric permittivity compared to previous nanocomposites with BaTiO₃ nanoparticles and also have high breakdown strength. At a 17.5% volume fraction, the nanocomposites show more than 145.3% increase in energy density above that of the pure P(VDF-TrFE- CFE) polymer (10.48 J/cm³ compared to 7.21 J/cm³). This value is significant and exceeds those reported for the conventional polymer-ceramic composites; it is also more than two times larger than high performance commercial materials. The findings of this research could lead to broad interest due to the potential for fabricating next generation energy storage devices.

Proceedings Article | 28 April 2011 Paper

Improved energy density of nanocomposites with aligned PZT nanowires

Haixiong Tang, Yirong Lin, Henry Sodano

Proceedings Volume 7978, 79780S (2011) https://doi.org/10.1117/12.881129

KEYWORDS: Ferroelectric materials, Nanocomposites, Dielectrics, Composites, Polymers, Ferroelectric polymers, Ceramics, Capacitors, Scanning electron microscopy, Nanowires

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The use of piezoelectric materials has become more popular for a wide range of applications, including structural health monitoring, power harvesting, vibration sensing and actuation. However, piezoceramic materials are often prone to breakage and are difficult to apply to curved surfaces when in their monolithic form. One approach to alleviate these issues is to embed the fragile piezoceramic inclusion into a polymer matrix. The flexible nature of the polymer matrix protects the ceramic from breaking under mechanical loading and makes the resulting compoistes easier to apply onto curved structure. However, most developed active ceramic composites have relatively low electroelastic coupling compared to bulk piezoceramics. There are two main methods to improve the eletroelastic properties of piezoceramic composites, namely using higher aspect ratio active inclusions and alignment of inclusions in the electric field direction. In this paper, the dielectric and energy storage property of nanowire composites is significantly enhanced by aligning the nanowires in the direction of the applied electrical field. PZT nanowires are hydrothermally synthesized and solutioncast into a polymer matrix, and then aligned using a shear flow based stretching method. The alignment was evaluated by scanning electron microscopy images and it is shown that the nanowires can be successfully aligned in the PVDF. The dielectric constant and energy density of the nanocomposites were tested using Agilent E4980A LCR meter and Sawyer-Tower circuit. This testing result shows that the dielectric constant and energy density of the composites can be increased by as much as 35.7% and 49.3% by aligning the nanowires in the electric field direction. Piezoceramic composites with enhanced energy storage property could lead to broader applications when using this type of materials for polymer based capacitive energy storage.

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