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Bismuth niobate-based glass-ceramic material with high energy storage density and its preparation method and application

A bismuth niobate-based glass with high energy storage density technology, which is applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the problems of low energy storage density, limited application, and bulky pulse power system, and achieve storage The effect of high energy density, wide crystallization temperature range, great research value and practical application significance

Active Publication Date: 2021-07-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively low energy storage density of current practical energy storage materials, the volume of the pulse power system is too large, which greatly limits the application of this technology.

Method used

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  • Bismuth niobate-based glass-ceramic material with high energy storage density and its preparation method and application
  • Bismuth niobate-based glass-ceramic material with high energy storage density and its preparation method and application
  • Bismuth niobate-based glass-ceramic material with high energy storage density and its preparation method and application

Examples

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preparation example Construction

[0030] The preparation method of the above-mentioned bismuth niobate-based glass-ceramic material with high energy storage density comprises the following steps:

[0031] (1) with Bi 2 o 3 , Nb 2 o 5 and SiO 2 As raw material, according to 25Bi 2 o 3 -25Nb 2 o 5 -50SiO 2 The molar chemical ratio ingredients, after rolling and mixing evenly, high-temperature melting, to obtain high-temperature glass melt;

[0032] (2) Pour the high-temperature glass melt prepared in step (1) into a preheated copper mold to form and maintain the preheating temperature to remove the residual stress in the glass, and prepare amorphous glass with uniform composition. After slicing get glass flakes;

[0033] (3) Performing controlled crystallization on the glass flakes prepared in step (2) to obtain the bismuth niobate-based glass-ceramic material with high energy storage density.

[0034] The preferred process condition for step (1) high-temperature melting is: heat preservation at 1500-...

Embodiment 1

[0039] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps:

[0040] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0041] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0042] (3) Put an equal number of glass flakes prepared in step (2) into a square crucible, heat up to 700°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0043] The energy storage density of the sample prepared in this embodiment is as follows: figure 1 A...

Embodiment 2

[0045] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps

[0046] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0047] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0048] (3) Put an equal amount of the glass flakes prepared in step (2) into a square crucible, heat up to 750°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0049] The energy storage density of the sample prepared in this embodiment is as follows: figure ...

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Abstract

The invention relates to a bismuth niobate-based glass-ceramic material with high energy storage density and its preparation method and application. The chemical composition of the bismuth-niobate-based glass-ceramic material conforms to the general formula 25Bi 2 o 3 ‑25Nb 2 o 5 ‑50SiO2 2 , the main crystal phase is bismuth niobate; its preparation method is prepared by high temperature melting-controlled crystallization method. Compared with the prior art, the present invention has the advantages of higher energy storage density, better temperature stability, simple preparation method, low cost, and greater potential for subsequent research and application.

Description

technical field [0001] The invention relates to the field of dielectric energy storage materials, in particular to a bismuth niobate-based glass ceramic material with high energy storage density and a preparation method thereof. Background technique [0002] In recent years, as an important part of various electronic systems, pulse counting has been widely used in electronic computers, television, communications, radar, remote control, automatic control, radio navigation and measurement technology and other fields. Pulse technology refers to short-term energy release with a power of more than 100 megawatts (MW) and a pulse width of less than 1s. The pulse power device can be simplified to store low-power electric energy in an energy storage device, such as a capacitor, etc. When the stored energy reaches a specified value, it is converted through a charge-discharge circuit to convert the stored energy in a very short time Release quickly to achieve the purpose of high curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03B19/02C03B32/02H01G4/10
CPCC03B19/02C03B32/02C03C10/0009H01G4/105
Inventor 翟继卫田佳沈波
Owner TONGJI UNIV
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