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ST-NBT-BT ceramic material with high energy storage density and preparation method thereof

A technology of ST-NBT-BT and high energy storage density, applied in the field of high energy storage density ST-NBT-BT ceramic materials and their preparation, can solve problems such as unsatisfactory energy density values, and achieve low dielectric loss and relaxation. Henan characteristics, low material cost, and the effect of enhanced polarization

Active Publication Date: 2018-05-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy density values ​​obtained are not ideal

Method used

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  • ST-NBT-BT ceramic material with high energy storage density and preparation method thereof
  • ST-NBT-BT ceramic material with high energy storage density and preparation method thereof
  • ST-NBT-BT ceramic material with high energy storage density and preparation method thereof

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preparation example Construction

[0031] A preparation method of high energy storage density ST-NBT-BT ceramic material, comprising the following steps:

[0032] Step 1: Prepare pure-phase ST, NBT and pure-phase BT for later use. 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 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 Mix to form mixture B; weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture C. Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 、BaCO 3 The purity is above 99.0%;

[0033] Step 2: Take the mixtures A, B and C respectively with zirconium balls and deionized water, according to the mass ratio of 1:2:(0.8~1), 1:2:(0.9~1) and 1:(1.8~2.0 ): (1 ~ 1.2) After mixing, use a planetary ball mill for 18 ~ 24 hours, then dry at 85 ~ 100 ° C for 20 ~ 24 hours, after briquetting, put them in a box furnace at 1150 ~ 1200 ° C for 2.5 ~ 3 hours, heat preservation at 820-840°C for 3-4 hours and 1150-1250°C for 3.5-4 hours...

Embodiment 1

[0040] The high energy storage density ST-NBT-BT ceramic material and the preparation method thereof of the present invention have a formula of (0.8-x)ST-0.2NBT-xBT, wherein x=0.2.

[0041] Step 1: Prepare pure-phase ST, NBT and pure-phase BT for later use. 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 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 Mix to form mixture B; weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture C. Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 、BaCO 3 The purity is above 99.0%.

[0042] Step 2: Mix mixtures A, B and C with zirconium balls and deionized water respectively, according to the mass ratio of 1:2:0.8, 1:2:0.9 and 1:1.8:1, and then use a planetary ball mill to mill for 18 hours , and then dried at 85°C for 20h and briquetting, then placed in a box furnace for 2.5 hours at 1150°C, 3 hours at 820°C and 3.5 hours at 1150°C to form ST powder, NBT powde...

Embodiment 2

[0048] The high energy storage density ST-NBT-BT ceramic material and the preparation method thereof of the present invention have a formula of (0.8-x)ST-0.2NBT-xBT, wherein x=0.25.

[0049] Step 1: Prepare pure-phase ST, NBT and pure-phase BT for later use. 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 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 Mix to form mixture B; weigh BaCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture C. Na 2 CO 3 、 Bi 2 o 3 , SrCO 3 、TiO 2 、BaCO 3 The purity is above 99.0%.

[0050] Step 2: Mix the mixtures A, B and C with zirconium balls and deionized water respectively according to the mass ratio of 1:2:0.9, 1:2:1 and 1:1.9:1.1, and then use a planetary ball mill to mill for 20 hours , and then dried at 90°C for 22 hours and briquetting, and placed in a box furnace for 2.8 hours at 1180°C, 3.5 hours at 830°C and 3.8 hours at 1200°C to form ST powder,...

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Abstract

The invention discloses an ST-NBT-BT ceramic material with high energy storage density and a preparation method thereof. The preparation method comprises the following steps: firstly, weighing raw materials with corresponding masses respectively according to a molar ratio to synthesize ST powder, NBT powder and BT powder, mixing the ST powder, the NBT powder and the BT powder, performing ball milling, drying and briquetting to form fully-graded materials, and then screening the fully-graded materials sequentially to form sieved materials; secondly, pressing the sieved materials into samples, and sintering the prepared samples to obtain sintered samples; and finally, grinding and cleaning the sintered samples, uniformly coating front and back surfaces of the polished and cleaned sintered samples with silver electrode slurry, and sintering the samples coated with silver electrodes to obtain the ST-NBT-BT ceramic material with high energy storage density. The ST-NBT-BT ceramic material high energy storage density, obtained by the method provided by the invention, not only has high energy storage density, but also has a simple preparation process and a low material cost and is environment-friendly.

Description

technical field [0001] The invention relates to the field of ceramic capacitor materials, in particular to a high energy storage density ST-NBT-BT ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of electronic devices, dielectric capacitors are considered to provide effective technical solutions for energy storage applications because of their fast charge-discharge performance and high power density. However, power electronics and pulsed power systems based on dielectric capacitors usually have large volume and weight. In order to realize the miniaturization, light weight and integration of energy harvesting and storage capacitors, it is crucial to further increase the energy density of dielectric capacitors. [0003] In the modern series of dielectric capacitors, antiferroelectrics (AFEs) have zero remanent polarization (P r ) and high saturation polarization (P s ), have received increasing attention in energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/468C04B35/622C04B41/88
CPCC04B35/4682C04B35/47C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/3232C04B2235/3236C04B2235/3298C04B41/4535
Inventor 蒲永平崔晨薇
Owner SHAANXI UNIV OF SCI & TECH
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