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A manganese dioxide-doped barium-strontium niobate based glass ceramic energy-storing material and a preparing method thereof

A strontium barium niobate-based energy storage material technology, which is applied in the field of manganese dioxide-doped strontium barium niobate-based glass ceramic energy storage materials and its preparation, can solve the problem of low charge-discharge conversion efficiency, no obvious reduction, microscopic Inhomogeneous structure and other problems, to achieve the effect of excellent machining performance, reduced grain agglomeration, and dense and uniform microstructure

Inactive Publication Date: 2017-04-19
TONGJI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Although compared with traditional ferroelectric ceramic materials and polymer composite energy storage materials, barium strontium niobate-based glass ceramic energy storage materials have some obvious advantages such as higher dielectric constant and higher breakdown field strength. , but because there is still grain agglomeration in its microstructure, charges tend to gather at the interface between the glass matrix and the crystal phase, resulting in uneven microstructure, making its breakdown field strength much lower than the ideal value, and charging and discharging Low conversion efficiency and high dielectric loss, these existing problems have always affected the application of this material in practical pulse systems
[0005] In order to solve this kind of problem, many scholars have studied the improvement of energy storage characteristics of glass ceramics from the aspects of material composition and preparation methods. Influenced by the performance of ferroelectric glass-ceramic energy storage materials, it was found that microwave crystallization treatment can significantly improve the microstructure of the material and reduce the formation of dendrites. The energy density is very low, which is not conducive to the practical application of the material (for details, see pages 740 to 745 of Journal of Alloys and Compounds, Volume 617, 2014)
In addition, many scholars improve the microstructure and energy storage density by adding oxides. For example, Chen.G.H. et al. added a small amount of P to niobate glass ceramic energy storage materials. 2 o 5 , the energy storage density reaches 9.1J / cm 3 , but the dielectric loss of the material is as high as 0.013 (for details, see pages 46 to 48 of Materialletters, Volume 176, Issue 8, 2016); Zheng.J. et al. added rare earth oxide La 2 o 3 Adjust the micro-morphology of the niobate glass ceramic energy storage material and the crystallinity of the material to increase the energy storage density of the material. Although the dielectric loss of the material is reduced, it is still maintained at about 0.01, without a significant decrease ( For details, please refer to pages 1827 to 1832 of Ceramics international, Volume 42, 2016)

Method used

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  • A manganese dioxide-doped barium-strontium niobate based glass ceramic energy-storing material and a preparing method thereof
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  • A manganese dioxide-doped barium-strontium niobate based glass ceramic energy-storing material and a preparing method thereof

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Embodiment 1

[0035] Manganese dioxide-doped barium strontium niobate-based glass ceramic material with high energy storage density, high energy conversion efficiency and low dielectric loss:

[0036] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , MnO 2 For raw material ingredients, the molar percentages of the above components are 20%, 20%, 20%, 33.5%, 5%, 1.5%, 0%. After ball mixing for 20 hours, dry and melt at 1550°C for 2 hours ;

[0037] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 650° C. for 7 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;

[0038] 3) The glass flakes prepared in step 2) are crystallized at 1100°C at a heating rate of 3°C / min, holding time for 3 hours, and controlled to crystallize at a cooling rate of 3°C / min to 850°C, and then cooled with the furnace to At room temperature, a manganese dioxide-doped barium strontium n...

Embodiment 2

[0041] Manganese dioxide-doped barium strontium niobate-based glass ceramic material with high energy storage density, high energy conversion efficiency and low dielectric loss:

[0042] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , MnO 2 For raw material ingredients, the molar percentages of the above components are 20%, 20%, 20%, 33.5%, 5%, 1.5%, 0.05%. After ball mixing for 20 hours, dry and melt at 1550°C for 2 hours ;

[0043] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 650° C. for 7 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;

[0044] 3) The glass flakes prepared in step 2) are crystallized at 1100°C at a heating rate of 3°C / min, holding time for 3 hours, and controlled to crystallize at a cooling rate of 3°C / min to 850°C, and then cooled with the furnace to At room temperature, a manganese dioxide-doped barium strontiu...

Embodiment 3

[0048] Manganese dioxide-doped barium strontium niobate-based glass ceramic material with high energy storage density, high energy conversion efficiency and low dielectric loss:

[0049] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , MnO 2 For raw material ingredients, the molar percentages of the above components are 20%, 20%, 20%, 33.5%, 5%, 1.5%, 0.1%. After ball mixing for 20 hours, dry and melt at 1550°C for 2 hours ;

[0050] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 650° C. for 7 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;

[0051] 3) The glass flakes prepared in step 2) are crystallized at 1100°C at a heating rate of 3°C / min, holding time for 3 hours, and controlled to crystallize at a cooling rate of 3°C / min to 850°C, and then cooled with the furnace to At room temperature, a manganese dioxide-doped barium strontium...

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Abstract

The invention relates to a manganese dioxide-doped barium-strontium niobate based glass ceramic energy-storing material and a preparing method thereof. BaCO3, SrCO3, Nb<2>O5, SiO2, Al<2>O3, B2O3 and MnO2 in a mole ratio of 20:20:20:30-35:5:1-5:0-0.5 (and 0 not included) are adopted as raw materials to prepare the glass ceramic energy-storing material. The raw materials are ball-milled, mixed, then dried and subjected to high-temperature melting, the high temperature melt is rapidly poured to a copper mold and molded, then stress relieving is performed, and controlled crystallization is performed after a product is cut into glass slices to obtain the glass ceramic energy-storing material. Compared with the prior art, a proper amount of the MnO2 is added, thus effectively reducing dielectric loss (0.004), obviously improving the microscopic structure, inhibiting crystal grain agglomeration, making the microstructure compact and uniform, and ensuring material performance stability. The theoretical energy storage density of the glass ceramic energy-storing material is 9.2 J / cm<3>, and the energy conversion efficiency is as high as 88.9%.

Description

technical field [0001] The invention belongs to the field of dielectric energy storage materials, and in particular relates to a manganese dioxide-doped strontium barium niobate-based glass ceramic energy storage material and a preparation method thereof. Background technique [0002] In recent years, as an important part of various electronic systems, pulse technology has been widely used in the fields of electronic computers, television, communications, radar, telemetry and remote control, automatic control, radio navigation and measurement technology. There are three main parameters to judge the superiority of a pulse power system, one is the size of its stored energy; the other is its discharge speed, and the third is its energy conversion efficiency. Therefore, the stored energy of the pulse power system, its energy conversion efficiency and charge-discharge efficiency become the main parameters for judging the quality of the pulse power system, which requires the energ...

Claims

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Application Information

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IPC IPC(8): C03C10/00C03C6/04C03C4/16
CPCC03C10/0036C03C1/00C03C4/16
Inventor 沈波修绍梅翟继卫
Owner TONGJI UNIV
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