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Barium titanate-based high-energy-storage-density electronic ceramic and preparation method thereof

A high energy storage density, electronic ceramic technology, applied in the field of electronic components, can solve the problems of large electrostrictive effect of antiferroelectric materials, narrow sintering window, low energy storage efficiency, etc., and achieve chemical uniformity and electrical uniformity. High, high energy storage density and efficiency, the effect of energy storage performance improvement

Inactive Publication Date: 2020-04-17
XIAN TECHNOLOGICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Potassium sodium niobate-based energy storage ceramics require high preparation conditions due to their narrow sintering window, and the energy storage efficiency is lower than 65%.
Silver niobate-based energy storage ceramic raw materials need silver oxide, which is expensive and costly, and the antiferroelectric material produced has a large electrostrictive effect, which is not conducive to the application in energy storage elements

Method used

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  • Barium titanate-based high-energy-storage-density electronic ceramic and preparation method thereof
  • Barium titanate-based high-energy-storage-density electronic ceramic and preparation method thereof
  • Barium titanate-based high-energy-storage-density electronic ceramic and preparation method thereof

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preparation example Construction

[0032] The invention relates to a preparation method of barium titanate-based electronic ceramics with high energy storage density. Taking barium titanate ceramics as the object, the composition is designed according to electric domain engineering, and the barium titanate-based electronic energy storage ceramics is prepared by a solid phase method. . The prepared sample has high energy storage density and efficiency, and good temperature stability. Described method specifically comprises the following steps:

[0033] Step 1: Put Sr 2 +, Bi 3+ ,Mg 2+ ,Nb 5+ Ion doping into barium titanate ceramics to form (1-x)Ba (1-y) Sr y TiO 3 -xBi(Mg 2 / 3 Nb 1 / 3 )0 3 chemical composition, so that it is in the intersection region;

[0034] Step 2: Calculate the chemical ratio of the formula components obtained in Step 1, and weigh the high-purity BaCO 3 , SrCO 3 、 Bi 2 o 3 , MgO, TiO 2 and Nb 2 o 5 The powder is dried by ball milling, pre-sintered, pressed into tablets, and ...

Embodiment 1

[0052] Change the chemical composition to Ba 0.65 Sr 0.35 TiO 3 -0.10Bi(Mg 2 / 3 Nb 1 / 3 )O 3 According to the formula, the raw materials are weighed according to the chemical ratio, after ball milling for 24 hours, dried and pressed into tablets, the pressed columnar block is placed in a sintering furnace for sintering, pre-sintered at 1100°C for 2 hours, and cooled naturally; the pre-sintered ceramic powder After the second ball milling into powder, it is pressed into tablets, and the pressed disc is sintered in a sintering furnace, held at 600°C for two hours to remove the glue, and then the heating rate is 3°C / min, raised to 1320°C for 5 hours, Sintering is complete. Then cool naturally to room temperature to obtain barium titanate-based energy storage ceramics.

[0053] X-ray diffractometer (RINT 2000, Rigaku) ​​was used to detect the phase composition of the sample during pre-calcination, as figure 2 As shown, it is a typical pseudo-cubic structure without diffracti...

Embodiment 2

[0055] Change the chemical composition to Ba 0.65 Sr 0.35 TiO 3 According to the formula, the raw materials are weighed according to the chemical ratio, after ball milling for 24 hours, dried and pressed into tablets, the pressed columnar block is placed in a sintering furnace for sintering, pre-sintered at 1050°C for 2 hours, and cooled naturally; the pre-sintered ceramic powder After secondary ball milling into powder, press into tablets, place the pressed discs in a sintering furnace for sintering, hold at 600°C for 2 hours to remove glue, then heat up at a rate of 3°C / min, raise to 1280°C for 5 hours, and sintering is complete . Then cool naturally to room temperature to obtain barium titanate-based energy storage ceramics.

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Abstract

The invention relates to barium titanate-based high-energy-storage-density electronic ceramic and a preparation method thereof. The preparation method comprises the following steps: doping Sr<2+>, Bi<3+>, Mg<2+> and Nb<5+> ions into barium titanate ceramic to form a chemical composition of (1-x)Ba(1-y)SryTiO3-xBi(Mg2 / 3Nb1 / 3)03, and enabling the chemical composition to be in a crossed region; and 2, calculating the chemical proportion of the formula components obtained in the step 1, weighing high-purity BaCO3, SrCO3, Bi2O3, MgO, TiO2 and Nb2O5 powder, and carrying out ball-milling drying, presintering, tabletting and sintering to obtain the barium titanate-based high-energy-storage-density electronic ceramic. According to the method, electric domain engineering, Rankine free energy calculation and the like are introduced in the component design process; compared with an existing product, the energy storage performance of the ceramic prepared through a solid-phase method is greatly improved, the technological process is simple, prepared samples are uniform in grain size and high in chemical uniformity and electrical uniformity, and high energy storage density and efficiency are shown.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a barium titanate-based electronic ceramic with high energy storage density and a preparation method thereof. Background technique [0002] Pulse power capacitors have the advantages of high power density, fast charge and discharge speed, anti-cycle aging, and are suitable for extreme environments such as high temperature and high pressure. They meet the requirements of energy utilization in the new era and play a key role in power electronic systems. High energy storage density ceramic capacitors can be used as inverter equipment for new energy power generation systems or hybrid vehicles; they can supply tanks, electromagnetic guns, electrified launch platforms, and integrated all-electric propulsion ships with ultra-high loads up to 100kA working current to form high-energy The duration of the pulse is not less than 10 -1 s; it can be used as the drive element of particle ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3213C04B2235/3206C04B2235/3251C04B2235/3298C04B2235/6562C04B2235/6567C04B2235/96
Inventor 戴中华谢景龙樊星刘卫国
Owner XIAN TECHNOLOGICAL UNIV
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