Dielectric energy-storing anti-ferroelectric ceramic material and preparation method thereof

A ceramic material and dielectric energy storage technology, applied in the field of dielectric energy storage antiferroelectric ceramic materials and their preparation, can solve problems such as poor temperature stability

Active Publication Date: 2017-12-12
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a dielectric energy storage antiferroelectric ceram

Method used

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  • Dielectric energy-storing anti-ferroelectric ceramic material and preparation method thereof
  • Dielectric energy-storing anti-ferroelectric ceramic material and preparation method thereof

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preparation example Construction

[0032] The invention provides a method for preparing a dielectric energy storage antiferroelectric ceramic material, comprising:

[0033] (1) mixing the antiferroelectric ceramic powder material with a negative temperature coefficient of energy storage density and the antiferroelectric ceramic powder material with a positive temperature coefficient of energy storage density according to the mass ratio (30-80):(20-70) to obtain a mixed powder;

[0034] (2) Add polyvinyl alcohol solution to the mixed powder, and then sinter to obtain the dielectric energy storage antiferroelectric ceramic material.

Embodiment 1

[0036] (1) Preparation of antiferroelectric ceramic powder material with negative temperature coefficient of energy storage density:

[0037]Weigh the raw materials PbO (99.9%), BaCO 3 (99.8%), La 2 o 3 (99.9%), ZrO 2 (99.5%), SnO 2 (99.6%) and TiO 2 (99.6%), adopt wet ball milling method, according to raw material: alcohol=1: 0.6 mass ratio ball milling 6 hours, rise to 850 ℃ with 5 ℃ per minute after drying, in air insulation 3 hours. The obtained powder is ball milled, dried, and sieved, pre-pressed with a pressure of 20 MPa, and the pre-pressed powder is subjected to secondary sieving to obtain a pre-fired powder of an antiferroelectric ceramic material with a negative temperature coefficient of energy storage density .

[0038] (2) Preparation of antiferroelectric ceramic powder material with positive temperature coefficient of energy storage density:

[0039] Weigh raw materials PbO (99.9%), La 2 o 3 (99.9%), ZrO 2 (99.5%), SnO 2 (99.6%) and TiO 2 (99.6%), ad...

Embodiment 2

[0043] (1) make the calcined powder body of energy storage density negative temperature coefficient antiferroelectric ceramic material with (1) identical method in embodiment 1;

[0044] (2) make the calcined powder body of energy storage density positive temperature coefficient antiferroelectric ceramic material with (2) identical method in embodiment 1;

[0045] (3) Mix the antiferroelectric ceramic material with negative temperature coefficient of energy storage density and antiferroelectric ceramic material with positive temperature coefficient of energy storage density according to the mass ratio of 50:50, ball mill and mix for 4 hours, after drying and pulverizing, add concentration 5% PVA solution, the solution accounted for 8% by mass of the powder, after granulation and dry pressing, sintering at 1230°C for 3 hours, and annealing at 1000°C for 1 hour to make a dielectric storage Antiferroelectric ceramic materials.

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Abstract

The invention discloses a dielectric energy-storing anti-ferroelectric ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing an energy-storing density negative temperature coefficient anti-ferroelectric ceramic material and an energy-storing density positive temperature coefficient anti-ferroelectric ceramic material according to the mass ratio being (30-80):(20-70) to obtain mixed powder; and adding a polyvinyl alcohol solution into the mixed powder and sintering to obtain the dielectric energy-storing anti-ferroelectric ceramic material. The energy-storing material, with energy-storing density stability being more than 85 percent within a wide temperature area range (20 to 150 DEG C), energy-storing efficiency being 85 percent (150 DEG C) and lowest energy-storing density being 2.77 J/cm<3>, is obtained through solid solution of the energy-storing density negative temperature coefficient anti-ferroelectric ceramic material and the energy-storing density positive temperature coefficient anti-ferroelectric ceramic material. The technical problem of low temperature stability in the existing anti-ferroelectric ceramic material is solved, and important value on the actual application of the anti-ferroelectric ceramic material is achieved.

Description

technical field [0001] The invention belongs to the field of electric energy storage materials, and more specifically relates to a dielectric energy storage antiferroelectric ceramic material and a preparation method thereof. Background technique [0002] According to the working mechanism, electrical storage devices can be divided into three categories: batteries, electrochemical capacitors and dielectric capacitors. Dielectric capacitors store energy through dielectric polarization, domain steering or phase change behavior, with small specific capacity (less than 30W h / kg), but very high specific power (up to 108W / kg), suitable for high pulse Voltage or current supply, and is significantly better than batteries and electrochemical capacitors in terms of resistance to cyclic aging and rapid discharge. At present, dielectric capacitors have become an indispensable part of solar energy, wind energy and other new energy power generation systems and hybrid vehicle inverter equ...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/626
Inventor 姜胜林刘品张光祖杨东海郇正利
Owner HUAZHONG UNIV OF SCI & TECH
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