SrTiO<3>-based lead-free high-energy-density ceramic material and preparation method thereof

A high energy storage density, ceramic material technology, applied in the direction of fixed capacitor dielectrics, fixed capacitor components, etc., can solve the problems of low improvement rate and non-compliance with market requirements, and achieve polarization strength improvement, low cost, and material cost. low effect

Inactive Publication Date: 2017-04-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although researchers are improving the SrTiO 3 Some efforts have been made on the energy storage density of ceramic-based materials, but its energy storage density is still at 1J / cm 3 Left and right, the improvement rate is low, and it does not meet the market requirements, so it is necessary to improve the SrTiO 3 Modification of ceramic materials to obtain energy storage capacitor materials with excellent dielectric properties

Method used

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  • SrTiO&lt;3&gt;-based lead-free high-energy-density ceramic material and preparation method thereof
  • SrTiO&lt;3&gt;-based lead-free high-energy-density ceramic material and preparation method thereof
  • SrTiO&lt;3&gt;-based lead-free high-energy-density ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] SrTiO of this example 3 Based lead-free high energy storage density ceramic material, its formula is (1-x)SrTiO 3 -xNa 0.5 Bi 0.5 TiO 3 , Where x=10mol%.

[0037] Step 1: prepare pure phase SrTiO 3 And pure phase Na 0.5 Bi 0.5 TiO 3 spare. Weigh SrCO according to the molar ratio of 1:1 3 And TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio of 1:1:4 2 O 3 , Na 2 CO 3 And TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 O 3 , Na 2 CO 3 And TiO 2 The purity is 99.0% or more.

[0038] Step 2: Take the mixtures A and B, respectively, with zircon balls and deionized water, and mix them according to the mass ratio of 1:2:1.5, then use a planetary ball mill to ball mill for 7 hours, then dry at 85°C for 14 hours, and after briquetting, Placed in a box furnace at 1180°C for 3 hours and 850°C for 4 hours to form pre-composites of mixtures A and B for use;

[0039] Step 3: Take the mixture A pre-synthetic material and the mixture B pre-synthetic material, weigh 10 mol% of t...

Embodiment 2

[0045] SrTiO of this example 3 Based lead-free high energy storage density ceramic material, its formula is (1-x)SrTiO 3 -xNa 0.5 Bi 0.5 TiO 3 , Where x=20mol%. Other conditions are the same as in Example 1.

Embodiment 3

[0047] SrTiO of this example 3 Based lead-free high energy storage density ceramic material, its formula is (1-x)SrTiO 3 -xNa 0.5 Bi 0.5 TiO 3 , Where x=30mol%, and other conditions are the same as in Example 1.

[0048] For testing the products of Examples 1-3, please refer to Figure 1-3 As shown, the prepared SrTiO 3 It can be seen from the XRD pattern that a pure phase of SrTiO is prepared 3 Powder. Prepared Na 0.5 Bi 0.5 TiO 3 It can be seen from the XRD pattern that the preparation contains Bi 4 Ti 3 O 12 Na of the second phase 0.5 Bi 0.5 TiO 3 Powder. At the same time, from image 3 It can be seen that (1-x)SrTiO 3 -xNa 0.5 Bi 0.5 TiO 3 (x=10mol%, 20mol%, 30mol%) The ceramic powder forms a pure phase perovskite structure, and there is no second phase. Na 0.5 Bi 0.5 TiO 3 Fully into SrTiO 3 The crystal lattice forms a solid solution and has a cubic structure. Figure 4(a) to Figure 4(c) The shaded part represents the energy storage density (J d ), see Table 1 for specific p...

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Abstract

The invention discloses an SrTiO<3>-based lead-free high-energy-density ceramic material and a preparation method thereof, and belongs to the technical field of material preparation. According to the method, firstly, 10 to 30 mol percent of Na<0.5>Bi<0.5>TiO<3> powder is added into SrTiO<3> powder to form a mixture; the mixture is subjected to ball milling and drying to obtain dried materials; then, the dried materials are sequentially granulated and sieved to form granulation materials; the granulation materials are made into test specimens; then, sintering is performed to obtain sintering test specimens; grinding and cleaning are performed on the obtained sintering test specimens; the front side and the back side of the ground and cleaned sintering test specimens are uniformly coated with silver electrode slurry; then, sintering is performed; and (1-x)SrTiO<3>-xNa<0.5>Bi<0.5>TiO<3> ceramics are obtained. The high-energy-density ceramic material obtained by using the method provided by the invention has the advantages that the preparation process is simple; the material cost is low; and the mass production can be realized, so that an effective path is provided for the application of the high-energy-density ceramic material.

Description

[0001] 【Technical Field】 [0002] The invention belongs to the technical field of material preparation, and specifically relates to a SrTiO 3 -Based lead-free ceramic material with high energy storage density and preparation method thereof. [0003] 【Background technique】 [0004] The portability and miniaturization of pulsed power systems require energy storage media to have higher energy storage density. Therefore, the development of ceramic media with high dielectric constant and high breakdown strength has become the key to the miniaturization of pulsed power devices. Dielectric capacitors mostly use ceramics or solid organic dielectric materials as energy storage media. They have obvious advantages in anti-cyclic aging and high temperature and high pressure conditions, and this type of capacitors pass dielectric polarization, domain turning or phase Variable behavior for energy storage, suitable for high pulse voltage or current supply. In the process of charging and dischargin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622C04B41/88H01G4/12
CPCC04B35/47C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3234H01G4/1227
Inventor 蒲永平崔晨薇
Owner SHAANXI UNIV OF SCI & TECH
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