Ccto-P(VDF-CTFE) 0-3 Composites for Energy Storage Application

Tuesday, October 13, 2015
West Hall 1 (Phoenix Convention Center)


Recently, there is a great need to develop a new ceramic-polymer composite which exhibits relatively high dielectric constant, high dielectric strength, low dielectric loss and high flexibility for applications ranging from electronic packaging, embedded capacitors, to energy storage [1, 2]. The electric energy density (Ue) can be calculated by the equation Ue=1/2ε0εrEb2, where ε0 is the vacuum permittivity (8.85×10-12 F/m), εr is dielectric constant of composite, and Eb is dielectric breakdown field. A higher dielectric constant or dielectric strength would allow a higher energy density, are highly desirable for the dielectrics used in energy storage devices [2]. Ceramic-polymer composites have been detail studied by researchers, and most of the recent studies were focused on the PVDF-based composites.

In this experiment, the nano-sized CaCu3Ti4O12 powder and P(VDF-CTFE) 88/12 mol.% are used for prepare composites by solution cast with high dielectric constant in previous work [3, 4]. To enhance the uniform distribution of ceramic filler in polymer matrix, the CCTO powder was firstly coated with the coupling agent 1 H, 1H, 2H, 2H Perfluorooctyltrichlorosilane, which can be used to improve the dielectric breakdown field. The coated powder was mixed with P(VDF-CTFE) in dimethyl formamide (DMF) solution then casting as thin film at 70oC and annealed with different temperatures. The dielectric constant and dielectric strength of the composites were studied using Impedance Analyzer and H.V. Supply Amplifier/Controller respectively. The annealing effect, amount of coupling agent and temperature dependence of dielectric properties were studied for these composite films. The energy density in these nanocomposites can reach around 4.5 J/cm3 with volume fraction of CCTO around 15 vol.%, which makes them attractive for high energy density capacitors and electric energy storage devices.

[1] B. Chu, X. Zhou, K. Ren, B. Neese, M. Liu, Q. Wang, F. Bauer and Q. M. Zhang, “A dielectric polymer with high electric energy density and fast discharge speed,” Science vol.313, 334-336, 2006.
[2] Z. M. Dang, J. K.Yuan, S. H. Yao, and R. J. Liao “ Flexible nanodielectric materials with high permittivity for power energy storage,” Adv. Mater., vol. 25, pp. 6334-6365, 2013.
[3] L. Zhang, X. B. Shan, P. X. Wu and Z.-Y. Cheng, “Dielectric characterization of CaCu3Ti4O12/P(VDF-TrFE) nanocomposites,” Appl. Phys. A, vol. 107, pp. 597-602, 2012.
[4] X. B. Shan, L. Zhang, X. Q. Yang, and Z.-Y. Cheng, “Dielectric composite with a high and temperature-independent dielectric constant,” J. Adv. Ceram. Vol.1, pp. 310-316, 2012.