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Polylactic acid dielectric thin film and application thereof as well as method for preparing polylactic acid dielectric thin film and application of method

A polylactic acid and dielectric technology, applied in the field of film capacitor energy storage, can solve the problems of low energy density, low charge and discharge efficiency, low energy energy density, poor thermal stability, etc., and achieve simple equipment requirements, light weight, and good thermal stability Effect

Pending Publication Date: 2022-01-14
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low energy density and charge-discharge efficiency, poor thermal stability, low energy energy density, difficult to degrade in the natural environment, easy to cause environmental pollution and other problems in the dielectric film in the prior art, and provide A polylactic acid dielectric film and its application, a method for preparing a polylactic acid dielectric film and its application. The polylactic acid dielectric film has the characteristics of biodegradability, high energy density, charge and discharge efficiency, and good thermal stability. It has excellent energy storage performance and can still maintain its performance stability at high temperature

Method used

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  • Polylactic acid dielectric thin film and application thereof as well as method for preparing polylactic acid dielectric thin film and application of method
  • Polylactic acid dielectric thin film and application thereof as well as method for preparing polylactic acid dielectric thin film and application of method
  • Polylactic acid dielectric thin film and application thereof as well as method for preparing polylactic acid dielectric thin film and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Weigh 0.1g of poly-d-lactic acid powder and add it to 20mL of dichloromethane solvent, stir until the solid particles of poly-d-lactic acid are completely dissolved, cast the stirred solution on a clean flat mold, and let the solvent cool at 25°C Slowly volatilize and dry for 20 hours to obtain the initial film material.

[0077] Fix the two ends of the completely dry initial film material on the first translation platform and the second translation platform respectively, use the heating power supply to adjust the temperature of the heating wire to 90°C, and control the first translation platform and the second translation platform to move in the same direction through the controller Move to achieve stretching of the initial film material, and control the moving rates of the first stage and the second stage so that the moving rate of the first stage 1 is 0.01 mm / s, and the moving rate of the second stage is 0.04 mm / s, stretching the initial film material up to 4 times. ...

Embodiment 2

[0079] Consistent with Example 1, the difference is that the two-way synchronous stretching is used to adjust the moving rate of the first translation stage (1) so that the stretching rate is 0.02mm / s, and the moving speed of the second translation stage (5) is such that The stretching rate was 0.08 mm / s. A polylactic acid dielectric film was obtained. The breakdown field of the polylactic acid dielectric film is 720MV / m, the peak intensity of the (110) crystal plane measured by XRD is 21322, and the peak intensity of the (203) crystal plane is 208.

Embodiment 3

[0081] Same as Example 1, except that the original film was stretched to 3 times. A polylactic acid dielectric film was obtained. The breakdown field of the polylactic acid dielectric film is 680MV / m, the peak intensity of the (110) crystal plane measured by XRD is 18901, and the peak intensity of the (203) crystal plane is 438.

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Abstract

The invention relates to the field of thin film capacitor energy storage, and in particular, relates to a polylactic acid dielectric thin film and an application thereof, and a method for preparing the polylactic acid dielectric thin film and an application of the method. The peak intensity of the (110) crystal face of the polylactic acid dielectric thin film measured by XRD is 15000-30000, and the peak intensity of the (203) crystal face of the polylactic acid dielectric thin film is not greater than 1000. The polylactic acid dielectric thin film provided by the invention has the characteristics of biodegradability, high energy density, high charge-discharge efficiency and good thermal stability, shows excellent energy storage performance at normal temperature, and can still keep the stability of the performance at high temperature.

Description

technical field [0001] The invention relates to the field of film capacitor energy storage, in particular to a polylactic acid dielectric film and its application, a method for preparing the polylactic acid dielectric film and its application. Background technique [0002] With the development of economy and society, the energy problem is becoming more and more prominent, and the demand is becoming more and more stringent. Capacitors play an important role in power systems, electronics industries, and control systems. Dielectric capacitors have the advantages of high energy density, high charge and discharge efficiency, fast response, long life, and low cost. In general, the energy density (U e ) can be described as: U e =1 / 2ε 0 ε r E. 2 , where ε 0 is the vacuum dielectric constant (8.85×10 -12 F / m), ε r is the relative permittivity of the dielectric material, and E is the breakdown electric field strength. Therefore, the energy energy density of dielectric materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J5/18H01G4/33
CPCC08J5/18H01G4/33C08J2367/04C08J2467/04
Inventor 任凯亮王永桂
Owner BEIJING INST OF NANOENERGY & NANOSYST
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