Fabrication of Energy Storage Media BST/PVDF-PAn
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0949-C05-04
Fabrication of Energy Storage Media BST/PVDF-PAn Dabing Luo1, Yan Guo2, Hua Hao3, Hanxing Liu4, and Shixi Ouyang4 1 State Key Laboratory of Advanced Technology for Materials' Synthesis and Processing, Wuhan University of Technology, Luoshi Rd.122#, Hongshan District,Wuhan City, Hubei, Wuhan, 430070, China, People's Republic of 2 School of Materials Science and Engineering, Wuhan Unvisity of Technology, Luoshi Road 122#, hongshan district, Wuhan Hubei, Wuhan, 430070, China, People's Republic of 3 State Key Laboratory of Advanced Technology for Materials' Synthesis and Processing, Wuhan Unvisity of Technology, Luoshi Rd.122#, Hongshan District, Wuhan City, Hubei, Wuhan, 430070, China, People's Republic of 4 State Key Laboratory of Advanced Technology for Materials' Synthesis and Processing, Wuhan Unvisity of Technology, Luoshi Rd. 122#, Hongshan District, Wuhan City, Hubei, Wuhan, 430070, China, People's Republic of ABSTRACT Permittivity and dielectric strength determine the energy storage density of a material. Although a composite can be molded easier, its lower energy storage density prevents the material from applications since the polymer usually has a poor dielectric constant. In order to enhance the energy storage performance of composites, PAn is introduced to PVDF by emulsion polymerization. SEM of the co-polymers show that they could construct continuous media until the concentration of aniline reached 25% while polymerizing. The permittivity of the polymer rise along with the increasing concentrate of aniline and the decreasing pH of solution. The permittivity and dielectric strength of composite changed correspondingly. As a consequence, the energy storage density increases much higher than ever. The maximum energy storage density could approach 0.9183J/cc. Keywords: Composite, energy storage density, couple of permittivity INTRODUCTION Energy storage media are evaluated by the energy storage density determined by formula (1):
℮=εU2/2
(1)
where, ℮ is the energy storage density, ε is the permittivity of the material, and U is the breakdown electric field of the material[1]. The formula shows that the higher permittivity and higher dielectric strength of the material are headed to raise energy storage density[2]. Furthermore, the material should also be easy to machine. Composites could take on all these features. Among the researches so far[3], the permittivity and the dielectric strength, especially the latter, were hard to enhance. Based on series model of a composite[4], the electric field is distributed according to the permittivity of components along the exerting electric direction (Z direction)[5]. However , there not only exist Z fields[6]. Inner fields are induced by the inhomogeneous electrical distribution due to the
permittivity difference between ceramics and polymers[7]. The real electric field distribution could be expressed as formula (2): =++
(2)
In that formula, indicates the real electric strength matrix, indicates the electric strength matrix along exerting electric d
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