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Composite material with high energy storage density and charge-discharge performance, and preparation method of composite material

A technology with charge-discharge performance and high energy storage density, which is applied to components, circuits, capacitors, etc. of fixed capacitors. It can solve the problems of low energy storage density and achieve the effect of good temperature stability and superior charge and discharge performance

Active Publication Date: 2019-02-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the reports of the above literature, its energy storage density is still low and needs to be further improved.

Method used

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  • Composite material with high energy storage density and charge-discharge performance, and preparation method of composite material
  • Composite material with high energy storage density and charge-discharge performance, and preparation method of composite material
  • Composite material with high energy storage density and charge-discharge performance, and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , Na 2 CO 3 , SrCO 3 ,TiO 2 and MgO as raw materials for 0-3 type composites. According to chemical formula (Bi 0.32 Sr 0.42 Na 0.2 □ 0.06 )TiO 3 Weigh the material, add absolute ethanol and zirconia balls into the nylon tank for ball milling, discharge, and dry. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, cover the crucible after compaction, put it into a muffle furnace for calcination, raise it to 850°C at 5°C / min, keep it warm for 2 hours, cool it down to room temperature, and take it out with a grinder. Grinding in a bowl, pouring it into a corundum crucible again for compaction and calcining, the heating rate and holding time are the same as the first time.

[0031] (2) Adding the MgO raw material with a mass fraction of 3wt% to the powder obtained in step (1), and performing secondary ball milling, dischargin...

Embodiment 2

[0038] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , Na 2 CO 3 , SrCO 3 ,TiO 2 and MgO as raw materials for 0-3 type composites. According to chemical formula (Bi 0.32 Sr 0.42 Na 0.2 □ 0.06 )TiO 3 Weigh the material, add absolute ethanol and zirconia balls into the nylon tank for ball milling, discharge, and dry. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, cover the crucible after compaction, put it into a muffle furnace for calcination, raise it to 850°C at 5°C / min, keep it warm for 2 hours, cool it down to room temperature, and take it out with a grinder. Grinding in a bowl, pouring it into a corundum crucible again for compaction and calcining, the heating rate and holding time are the same as the first time.

[0039] (2) Adding the MgO raw material with a mass fraction of 3wt% to the powder obtained in step (1), and performing secondary ball milling, dischargin...

Embodiment 3

[0045] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , Na 2 CO 3 , SrCO 3 ,TiO 2 and MgO as raw materials for 0-3 type composites. According to chemical formula (Bi 0.32 Sr 0.42 Na 0.2 □ 0.06 )TiO 3 Weigh the material, add absolute ethanol and zirconia balls into the nylon tank for ball milling, discharge, and dry. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, cover the crucible after compaction, put it into a muffle furnace for calcination, raise it to 850°C at 5°C / min, keep it warm for 2 hours, cool it down to room temperature, and take it out with a grinder. Grinding in a bowl, pouring it into a corundum crucible again for compaction and calcining, the heating rate and holding time are the same as the first time.

[0046] (2) Adding the MgO raw material with a mass fraction of 3wt% to the powder obtained in step (1), and performing secondary ball milling, dischargin...

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Abstract

The invention relates to a composite material with high energy storage density and charge-discharge performance, and a preparation method of the composite material. The chemical formula of the composite material is (Bi0.32Sr0.42Na0.2[square]0.06)TiO3 / MgO, wherein [square] refers to a vacancy. Compared with the prior art, the composite material is lead-free and is an environment-friendly material;compared with antiferroelectric materials and other relaxant materials, a system disclosed by the invention has a large energy storage density (the energy storage density is 2.09 J / cm<3>), has the charge-discharge performance (the current density is 1671 A / cm<2>, and the power density is 150 MW / cm<3>), and has very short discharge time (0.15 mus). Particularly, the energy storage density and charge-discharge performance of the material are excellent in temperature stability. The excellent properties are beneficial to the application in pulsed capacitors, especially at high temperatures.

Description

technical field [0001] The invention belongs to the technical field of dielectric energy storage materials, and in particular relates to a composite material with high energy storage density and charge-discharge performance and a preparation method thereof. Background technique [0002] Due to the limited reserve capacity of petroleum and fossil fuels, the depletion of natural energy and the pressure of environmental protection, energy materials such as capacitors and electrochemical batteries have attracted much attention in recent years. Each material has disadvantages and advantages, and the biggest problem is to find a reliable, low-cost, high energy storage density and effective material. Batteries generally have high energy storage density, but the power density of batteries is low due to the limitation of their carrier mobility. The charging and discharging cycle of the battery is long, the charging and discharging speed is slow, and the operating temperature range o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626C04B35/634C04B35/638H01G4/12
CPCC04B35/475C04B35/622C04B35/62605C04B35/63416C04B35/638C04B2235/3201C04B2235/3206C04B2235/3213C04B2235/6562C04B2235/6567H01G4/1218
Inventor 翟继卫李峰江涛吴双昊沈波
Owner TONGJI UNIV
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