Lanthanum oxide doped strontium barium niobate based glass ceramic energy storage material and preparation method thereof

A strontium barium niobate based, glass ceramic technology, applied in the field of dielectric energy storage materials, can solve the problems of low charge-discharge conversion efficiency, low dielectric constant, low breakdown field strength, etc. The effect of increasing theoretical density and short charging and discharging time

Inactive Publication Date: 2018-12-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although compared with traditional ferroelectric ceramic materials, barium strontium niobate-based glass-ceramic materials have some obvious advantages, but due to the phenomenon of grain agglomeration in its microstructure, the charge gathers in the glass matrix and crystal phase interface, making it difficult to Its breakdown field strength is far lower than the ideal value, and the charge-discharge conversion efficiency is low; compared with traditional glass materials, although the dielectric constant has been greatly improved, glass ceramics are prone to precipitate low-permittivity phases. It also reduces the dielectric constant

Method used

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  • Lanthanum oxide doped strontium barium niobate based glass ceramic energy storage material and preparation method thereof
  • Lanthanum oxide doped strontium barium niobate based glass ceramic energy storage material and preparation method thereof
  • Lanthanum oxide doped strontium barium niobate based glass ceramic energy storage material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Lanthanum oxide-doped strontium barium niobate-based glass-ceramic material with high energy storage density and fast charge and discharge:

[0039] 1) BaCO with a purity greater than 99.5wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , La 2 o 3 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 ;

[0040] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 650°C for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5mm;

[0041] 3) The glass flakes prepared in step 2) were kept at 1100° C. for 3 hours for controlled crystallization to obtain glass ceramics.

[0042] XRD such as figure 1 As shown, there are two items in the XRD scanning pattern of this component are Ba 0.27 Sr 0.75 Nb 2 o 5.78 and BaAl 2 Si 2 o 8 ; SEM such as figure 2 A...

Embodiment 2

[0044] Lanthanum oxide-doped strontium barium niobate-based glass-ceramic material with high energy storage density and fast charge and discharge:

[0045] 1) BaCO with a purity greater than 99.5wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , La 2 o 3 For raw material batching, the molar percentages of the above components are 20%, 20%, 20%, 33.5%, 5%, 1.5%, 0.2%. After ball milling for 20 hours, dry and melt at 1550°C for 2 hours;

[0046] 2) Pouring the high-temperature melt obtained in step 1) into a copper mold, annealing for stress relief at 650° C. for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;

[0047] 3) The glass flakes prepared in step 2) were kept at 1100° C. for 3 hours for controlled crystallization to obtain glass ceramics.

[0048] The XRD of the sample that present embodiment makes is as figure 2 As shown, there are two items in the XRD scanning pattern of this component are Ba 0.27 Sr 0.75 Nb 2 o 5.78 ...

Embodiment 3

[0051] Lanthanum oxide-doped strontium barium niobate-based glass-ceramic material with high energy storage density and fast charge and discharge:

[0052] 1) BaCO with a purity greater than 99.5wt% 3 , SrCO 3 , Nb2O5, SiO 2 、Al 2 o 3 , B 2 o 3 , La 2 o 3 For raw material batching, the molar percentages of the above components are 20%, 20%, 20%, 33.5%, 5%, 1.5%, 0.5%, after ball milling for 20 hours, drying, and melting at 1550 °C for 2 hours;

[0053] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 650°C for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5mm;

[0054] 3) The glass flakes prepared in step 2) were kept at 1100° C. for 3 hours for controlled crystallization to obtain glass ceramics.

[0055] XRD such as figure 1 As shown, there are two items in the XRD scanning pattern of this component are Ba 0.27 Sr 0.75 Nb 2 o 5.78 and BaAl 2 Si 2 o 8 ; SEM such as figu...

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Abstract

The invention relates to a lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material and a preparation method thereof. The preparation method includes: blending according to a molar ratio of 20BaCO3-20SrCO3-20Nb2O5-33.5SiO2-5Al2O3-1.5B2O3-xLa2O3; after barreling and mixing, drying, and melting at high temperature; quickly pouring high-temperature melt into a copper die for forming; destressing and annealing at certain temperature, cutting into glass sheets, and performing controlled crystallization to obtain the lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material. Compared with similar materials, the glass ceramic energy storage material has excellent machining performance, and can be mechanically ground and processed into sheets with thickness lower than 80 um, and convenience is brought to subsequent machining of small devices; the glass ceramic energy storage material has excellent dielectric performance and breakdown field strength resistance.

Description

technical field [0001] The invention belongs to the field of dielectric energy storage materials, and in particular relates to a lanthanum oxide-doped strontium barium niobate-based glass ceramic energy storage material with high energy storage, fast charging and discharging, and high conversion efficiency 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 two 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. Therefore, its stored energy becomes the main parameter to judge whether the pulse power system is good or bad. Due to the low energy storage density of the current dielectric materials, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/14
CPCC03C10/0009
Inventor 沈波修绍梅肖石翟继卫
Owner TONGJI UNIV
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