NBT/PVDF three-layer structured composite material for energy storage and preparation method thereof

A technology of polyvinylidene fluoride and bismuth sodium titanate, which is applied in the direction of coating, etc., can solve the problems of polluting the environment, human health, toxic chemicals, and limiting energy storage density, and achieves safe and reliable preparation methods, simple process flow, and storage The effect that can improve efficiency

Inactive Publication Date: 2018-06-01
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

The core issue in the development of new energy technology is energy storage technology. However, for a long time, energy storage technology has not received enough attention, resulting in energy storage technology being unable to meet the needs of new energy technology development.
Compared with other energy storage devices, dielectric capacitors have unique advantages in the following aspects: fast charge and discharge speed, high power density, etc., but low energy storage density limits its further development
Polyvinylidene fluoride (PVDF)-based polymer materials have a larger breakdown field strength, and compared with other organic polymers, the dipole moment generated by the hydrogen atoms and fluorine atoms in the molecular chain can provide a higher Large dielectric polarization, however, its dielectric constant is still at a low level, which limits the improvement of energy storage density. A common improvement method is to add ceramic fillers with high polarization strength to the polymer matrix. To increase the energy storage density of composites, ceramic fillers such as sodium bismuth titanate (NBT)
However, since the breakdown field strength of ceramics is much smaller than that of polymers, this method of increasing polarization usually results in a decrease in breakdown field strength and an increase in leakage conductance.
Therefore, the energy storage performance of the ceramic / polymer composite with a simple structure will not be significantly improved, and the energy storage efficiency of the composite will decrease, which will not be conducive to practical applications.
In addition, the existing ceramic / polymer composite materials are usually prepared by chemical synthesis, which usually requires the use of toxic chemicals, and will produce toxic gases, pollute the environment and be harmful to human health , and the preparation method is complicated, the yield is low, and it is not suitable for large-scale practical use

Method used

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  • NBT/PVDF three-layer structured composite material for energy storage and preparation method thereof
  • NBT/PVDF three-layer structured composite material for energy storage and preparation method thereof
  • NBT/PVDF three-layer structured composite material for energy storage and preparation method thereof

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preparation example Construction

[0033] A preparation method for bismuth sodium titanate / polyvinylidene fluoride composite material for energy storage, comprising the following steps,

[0034] (1) take sodium carbonate, bismuth oxide and titanium dioxide raw materials according to the molar ratio;

[0035] (2) Put zirconia balls, raw materials and deionized water together into the ball mill tank for ball milling; the mass ratio of zirconia balls, raw materials and deionized water is (2~5):1:1, and the ball milling time is 3~6h;

[0036] (3) Pour the mixed slurry after ball milling into a vessel, put it in an oven, dry it at 70°C-150°C for 8-12 hours, grind and sieve to obtain a powder, and put the obtained powder into an alumina crucible, Put it into a muffle furnace for pre-firing, the pre-firing temperature is 700-900°C, and the holding time is 3-7 hours, and then take out the crucible after the muffle furnace is naturally cooled to room temperature, and the sodium bismuth titanate particle powder is obtain...

example 1

[0047] A kind of preparation method of the sodium bismuth titanate / polyvinylidene fluoride composite material used for energy storage of the present invention comprises the following steps, (1) taking sodium carbonate, bismuth oxide and titanium dioxide as raw materials according to the molar ratio;

[0048] (2) According to the mass ratio of 5:1:1, weigh the zirconia balls, raw materials and deionized water and add them into the ball mill jar for ball milling for 4 hours;

[0049] (3) Pour the mixed slurry after ball milling into a container, put it in an oven, dry it at 80°C for 12 hours, and then grind and sieve it to obtain a powder, put the obtained powder into an alumina crucible, put it into a muffle In the furnace, pre-fire at 800 ° C, the holding time is 4 hours, and then take out the crucible after the muffle furnace is naturally cooled to room temperature, and the sodium bismuth titanate particle powder is obtained;

[0050] (4) Weigh the zirconia balls, the bismuth...

example 2

[0059] A kind of preparation method of the sodium bismuth titanate / polyvinylidene fluoride composite material used for energy storage of the present invention comprises the following steps, (1) taking sodium carbonate, bismuth oxide and titanium dioxide as raw materials according to the molar ratio;

[0060] (2) According to the mass ratio of 2:1:1, weigh zirconia balls, raw materials and deionized water and add them into the ball mill jar for ball milling for 5 hours;

[0061] (3) Pour the mixed slurry after ball milling into a container, put it in an oven, dry it at 70°C for 8 hours, and then grind and sieve it to obtain a powder, put the obtained powder into an alumina crucible, put it into a muffle Pre-fire in the furnace at 750°C for 3 hours, and then take out the crucible after the muffle furnace cools down to room temperature naturally, and obtain the sodium bismuth titanate particle powder;

[0062] (4) Weigh the zirconia balls respectively according to the mass ratio ...

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Abstract

The invention discloses an NBT/PVDF three-layer structured composite material for energy storage and a preparation method of the NBT/PVDF three-layer structured composite material for the energy storage. NBT particle powder is prepared through a ball-milling method; PVDF is divided into three parts which are respectively dissolved in a solvent to obtain three PVDF solutions; the NBT particle powder is divided into two parts and respectively added to two PVDF solutions to obtain two NBT/PVDF stock solutions; the NBT/PVDF stock solutions, the PVDF solutions and the NBT/PVDF stock solutions are laminated and subjected to tape casting on a glass substrate sequentially by using a multi-layer tape casting process. A middle layer of the composite material is a pure PVDF polymer, and the two layers of the upper and lower layers are NBT/PVDF composite layers, dielectric ceramic particles are added in an upper-lower two-layer structure, the polarization intensity and energy storage density are used, and the middle layer uses the pure PVDF polymer to obtain high breakdown field strength.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a polymer-based high-energy-efficiency dielectric energy storage composite material filled with a three-layer structure inorganic medium and a preparation method thereof, in particular to a sodium bismuth titanate / polymeric material used for energy storage. A vinylidene fluoride three-layer composite material and a preparation method thereof. Background technique [0002] With the gradual shortage of energy in the world, the issue of sustainable environmental management has attracted much attention, and the development of new energy technologies has gradually become a new indicator of global economic growth. The core issue in the development of new energy technology is energy storage technology. However, for a long time, energy storage technology has not received enough attention, which has caused energy storage technology to be unable to meet the needs of new energy technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/42C08L27/16C08K9/04C08K3/24B29C41/32
CPCB29C41/32B29L2009/00C03C17/009C03C17/42C08K3/24C08K9/04C08L27/16
Inventor 王卓念雯雯王添肖雨佳陈浩楠王枭颖
Owner SHAANXI UNIV OF SCI & TECH
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