Modified BaTiO3/PI dielectric energy-storing three-layer composite film and preparation method thereof

Abstract

The invention discloses a modified BaTiO3 / PI dielectric energy-storing three-layer composite film and a preparation method thereof. The modified BaTiO3 / PI dielectric energy-storing three-layer composite film is composed of an upper layer, a lower layer and a middle layer, wherein the upper and lower layers are made of a PI composite material filled with BaTiO3 nanoparticles, and the middle layer is made of a pure PI material. The method employs an in-situ polymerization process and a coating process to prepare the modified BaTiO3 / PI three-layer composite film. Experimental results show that the composite film has excellent dielectric comprehensive properties, high breakdown field strength and energy storage density, so the composite film has great application prospects in the fields of capacitors and accumulators.

Description

technical field [0001] The invention relates to a modified BaTiO 3 / PI dielectric energy storage three-layer composite film and its preparation method. Background technique [0002] With the rapid development of electronic information technology, the upgrading of electronic products is getting faster and faster. The production and sales of consumer electronic products such as digital cameras, flat-panel TVs, and notebook computers continue to grow, driving the growth of the capacitor industry. The development of dielectric materials with good dielectric comprehensive properties and high breakdown field strength, energy storage density and processability, especially polymer-based nanocomposites has become a research hotspot. [0003] PI is one of the organic polymer materials with the best comprehensive properties. It can withstand high temperatures above 400°C. Its long-term use temperature range is -200-300°C. It has no obvious melting point and has high mechanical propert...

AI Technical Summary

Problems solved by technology

But BaTiO 3 Ceramics need to be sintered during the manufacturing process, which consumes a lot of energy and the process is complicated. Moreover, the flexibility of this dielectric material is poor, and cracks may occur when subjected to mechanical impact or severe temperature changes, which affects the use of capacitors.

Many researchers have prepared high-fraction-based nanocomposites by combining the two, which can effectively solve the problem of increasing the dielectric constant, but the breakdown drops rapidly.

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