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Bismuth ferrite-based dielectric film for high-density energy storage and preparation method and application thereof

A technology based on bismuth ferrite and bismuth ferrite, applied in the direction of fixed capacitor dielectric, circuit, capacitor, etc., can solve the problems of human health and environmental hazards, difficult to handle, etc., achieve high breakdown field strength, strong high voltage resistance, The effect of strong ferroelectricity

Inactive Publication Date: 2017-08-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lead contained in these materials is harmful to human health and the environment, and it is not easy to handle after being discarded.

Method used

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  • Bismuth ferrite-based dielectric film for high-density energy storage and preparation method and application thereof
  • Bismuth ferrite-based dielectric film for high-density energy storage and preparation method and application thereof
  • Bismuth ferrite-based dielectric film for high-density energy storage and preparation method and application thereof

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preparation example Construction

[0073] The method for preparing a bismuth ferrite-based dielectric thin film for high-density energy storage according to an embodiment of the present invention is performed by mixing BiFeO 3 with SrTiO 3 The bismuth ferrite-based raw material is prepared by mixing with the transition element Me. The doping of the transition element can reduce the leakage conductance of the bismuth ferrite-based dielectric film; by pre-sintering the bismuth ferrite-based powder, a series of physical and chemical reactions will occur. , can improve the composition and structure of bismuth ferrite-based powder, and improve the performance of bismuth ferrite-based powder; the bismuth ferrite-based dielectric film obtained by this method for high-density energy storage is characterized by lead-free environmental protection, high voltage resistance Strong ability and excellent energy storage performance. Bismuth ferrite has strong ferroelectricity and its spontaneous polarization can reach 100 μC / ...

Embodiment 1

[0078] The raw material Fe 2 O 3 , SrCO 3 , Bi 2 O 3 , TiO 2 and MnO 2 Press (1-x)Bi 1.1 Fe 0.995 Mn 0.005 O 3 -xSrTiO 3(x=0.30) chemical formula for ingredients, ball milling with absolute ethanol for 12 hours, drying and sieving, and pre-sintering the obtained powder at 760 degrees Celsius for 4 hours to obtain bismuth ferrite-based ceramic powder. PVA solution with a concentration of 5% (mass percentage) was added to the bismuth ferrite-based ceramic powder for granulation, and pressed into a bismuth ferrite-based ceramic disc with a diameter of about 1 inch and a thickness of about 5mm under a 12MPa tablet press. After heat preservation and removal of PVA, the bismuth ferrite-based ceramic disc was sealed and buried for 40 minutes at 1100 degrees Celsius to obtain a bismuth ferrite-based ceramic target.

[0079] Using pulsed laser deposition technology, a bismuth ferrite-based ceramic target is bombarded with a laser, so that its components diffuse into a niobiu...

Embodiment 2

[0082] The raw material Fe 2 O 3 , SrCO 3 , Bi 2 O 3 , TiO 2 and MnO 2 Press (1-x)Bi 1.1 Fe 0.995 Mn 0.005 O 3 -xSrTiO 3 (x=0.45) chemical formula for ingredients, ball-milling with absolute ethanol for 12 hours, drying and sieving, and pre-sintering the obtained powder at 760 degrees Celsius for 4 hours to obtain bismuth ferrite-based ceramic powder. PVA solution with a concentration of 5% (mass percentage) was added to the bismuth ferrite-based ceramic powder for granulation, and pressed into a bismuth ferrite-based ceramic disc with a diameter of about 1 inch and a thickness of about 5mm under a 12MPa tablet press. After heat preservation and removal of PVA, the bismuth ferrite-based ceramic disc was sealed and buried for 40 minutes at 1100 degrees Celsius to obtain a bismuth ferrite-based ceramic target.

[0083] Using pulsed laser deposition technology, a bismuth ferrite-based ceramic target is bombarded with a laser, so that its components diffuse into a niobi...

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Abstract

The invention discloses a bismuth ferrite-based dielectric film for high-density energy storage and a preparation method and application thereof. The bismuth ferrite-based dielectric film is characterized in that a general formula of the chemical composition of the dielectric film is (1-x)BiFeO(3-x)SrTiO3, wherein x is a mole fraction greater than 0 and less than 1. The dielectric film has excellent energy storage property; the energy storage density can reach 70.3J / cm<3>; and the energy storage efficiency is as high as 70%.

Description

technical field [0001] The invention belongs to the field of dielectric materials, and in particular, the invention relates to a bismuth ferrite-based dielectric film for high-density energy storage and a preparation method and application thereof. Background technique [0002] As the main passive energy storage device, dielectric capacitors are widely used in electronic circuits due to their fast charging and discharging speed and ultra-high power density. and other functions. However, its low energy storage density has become a bottleneck for its further development and application. The energy storage density of currently commercialized dielectric materials is only about 2 J / cm 3 , which is one to two orders of magnitude lower than electrochemical capacitors or batteries. Therefore, exploring dielectric materials with high energy storage density has always been a research hotspot in this field. [0003] Ceramic thin film dielectrics have large dielectric constants and ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/47C04B35/622C04B35/634C04B35/638C04B41/00C04B41/45H01G4/12
CPCC04B35/453C04B35/47C04B35/62218C04B35/63416C04B35/638C04B41/0036C04B41/0072C04B41/4529C04B2235/3267C04B2235/3272C04B2235/6567C04B2235/94C04B2235/95C04B2235/96H01G4/1209H01G4/1227
Inventor 林元华潘豪南策文沈洋
Owner TSINGHUA UNIV
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