Influence of Particle Size and Thickness of Material on Anti-voltage Strength of Energy-storage Composite
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0949-C03-07
Influence of Particle Size and Thickness of Material on Anti-Voltage Strength of Energy-Storage Composite Dabing Luo1, Yan Guo2, Hao Hua3, Hanxing Liu4, and Shixi Ouyang3 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 Material College, Wuhan university 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 University of Technology, Luoshi Rd. 122#, Hongshan District, Wuhan, Hubei, Wuhan, 430070, China, People's Republic of 4 State Key Laboratory of Advanced Technology for Materials¡¯ Synthesis and Processing, Wuhan University of Techology, Luoshi Rd. 122#, Hongshan District, Wuhan, Hubei, Wuhan, 430070, China, People's Republic of
ABSTRACT After combining the PVDF and BST powders with different particle sizes, the anti-voltage strengths of composites was tested. Although the concentrates of ceramic were all the same, their anti-voltage strengths were distinguished. The results showed that the bigger particles or less thickness of material could benefit to the anti-voltage strength and ultimately enhanced the energy storage density of composites. Moreover, the distribution of particle dimension also influenced the strengths of materials. Composite with homogeneous particles performed higher strength than that of composites with inhomogeneous particles. Keywords: Anti-voltage strength, thickness, particle size
INTRODUCTION Energy storage media was evaluated by the energy storage density, while energy storage density of material was determined by formula (1): ℮=εU2/2
(1)
where, ℮ was the energy storage density, ε was the permittivity of the material, U was the anti-voltage ability of the material. The formula recommended that the permittivity and anti-voltage ability of the material were the most important parameter. Higher permittivity and anti-voltage ability, higher energy storage
density did the material. Furthermore, the material should also be easy to machine. Composite could take all these features. Among the researches so far, the permittivity and anti-voltage ability were hard to enhance, especially the anti-voltage ability. Basing on serial model of composite, the electric field distributed according to the permittivity of components along the exerting electric direction (Z direction). However, there not only existed the Z fields. Inner fields were induced by the inhomogeneous electrical distribution due to the permittivity difference between ceramics and polymers. The real electric field distribution could be expressed as formula (2): =++
(2)
where, was the real electric strength matrix, was the electric strength matrix along exerting electric direction matrix, , were induced electric field strength matrixes along X and Y direction respectively. Obviously, the real electric st
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