Method for improving energy storage characteristics of barium titanate-based ceramic by using donor-acceptor composite doping
阅读说明：本技术 一种使用施主-受主复合掺杂提高钛酸钡基陶瓷储能特性的方法 (Method for improving energy storage characteristics of barium titanate-based ceramic by using donor-acceptor composite doping ) 是由 刘文凤 高静晗 程璐 李盛涛 于 2020-06-03 设计创作，主要内容包括：本发明公开了一种使用施主-受主复合掺杂提高钛酸钡基陶瓷储能特性的方法,涉及材料制备技术领域,包括：称量BaCO<Sub>3</Sub>、TiO<Sub>2</Sub>、MnCO<Sub>3</Sub>、Nb<Sub>2</Sub>O<Sub>5</Sub>粉末并使用介质混合后研磨得到第一浆料；将第一浆料烘干后过筛,将得到的混合粉末烧结得到合成第一粉料；将第一粉料过筛后研磨后得到第二浆料；将第二浆料烘干过筛后加入PVA胶获得粒径在60-100目之间的第二粉料,并使用压片机将所述第二粉料压成粗坯；将粗坯烧结得到钛酸钡基陶瓷样品。本发明的优势在于：(1)本发明的制备方法所用的原料无毒环保,制备和后续回收处理时不易造成环境污染；(2)本发明的制备方法制备的钛酸钡基陶瓷的储能效率更高,可达86％。(The invention discloses a method for improving the energy storage property of barium titanate-based ceramic by using donor-acceptor composite doping, which relates to the technical field of material preparation and comprises the following steps: weighing BaCO 3 、TiO 2 、MnCO 3 、Nb 2 O 5 Mixing the powder with a medium and then grinding to obtain first slurry; drying the first slurry, sieving, and sintering the obtained mixed powder to obtain synthesized first powder; sieving the first powder and grinding to obtain second slurry; drying and sieving the second slurry, adding PVA (polyvinyl alcohol) glue to obtain second powder with the particle size of 60-100 meshes, and pressing the second powder into a rough blank by using a tablet press; and sintering the rough blank to obtain a barium titanate-based ceramic sample. The invention has the advantages that: (1) the raw materials used in the preparation method are nontoxic and environment-friendly, and the preparation and the subsequent recovery treatment are not easy to cause environmental pollution; (2) the barium titanate-based ceramic prepared by the preparation method of the inventionThe energy storage efficiency is higher and can reach 86%.)
1. A method for improving the energy storage characteristics of barium titanate-based ceramics using donor-acceptor composite doping, said method comprising the steps of:
s100, weighing BaCO3、TiO2、MnCO3、Nb2O5Mixing the powder with a medium and then grinding to obtain first slurry;
s200, drying the first slurry, sieving, and sintering the obtained mixed powder to obtain synthesized first powder;
s300, sieving the first powder and grinding to obtain second slurry;
s400, drying and sieving the second slurry, adding PVA (polyvinyl alcohol) glue to obtain second powder with the particle size of 60-100 meshes, and pressing the second powder into a rough blank by using a tablet press;
and S500, sintering the rough blank to obtain a barium titanate-based ceramic sample.
2. The method according to claim 1, wherein the medium is alcohol in step S100, and the milling time is preferably 4-5 h.
3. The method as claimed in claim 1, wherein the sintering temperature in step S200 is 1100-1200 ℃.
4. The method of claim 1, wherein the milling time in step S300 is 8-10 hours.
5. The method of claim 1, wherein step S500 further comprises: and (3) placing the rough blank in a sintering furnace, heating to 1350 ℃ and 1450 ℃ at the heating rate of 80-100 ℃/h, and sintering for 8-10 hours to obtain the barium titanate-based ceramic sample.
Technical Field
The invention relates to the technical field of material preparation, in particular to a method for improving the energy storage property of barium titanate-based ceramic by using donor-acceptor composite doping.
Background
Pulse power capacitors are key components of pulse power technology and have been widely used in nuclear technology, electron beam, sanitary technology and power systems due to their high power density and fast charge-discharge time. Other energy storage devices (e.g., batteries and electrochemical capacitors) do not meet the high power density requirements of pulsed loads such as active armor, electric launch platforms and electrochemical guns. But the energy storage density of dielectric capacitors is lower than that of batteries and the like. Therefore, in order to achieve weight reduction and size reduction of the device and further improve the device performance, a first requirement is to find a method for improving the energy storage capacity of the dielectric capacitor.
Energy storage parameter-energy storage density W of capacitor dielectric materialrecAnd the energy storage efficiency η may be calculated using the following formula:
wherein, PmaxAnd PrRepresenting the maximum and remnant polarization, and E is the applied electric field. It is evident from the equation that materials with higher maximum polarization and lower remnant polarization, i.e. large Pmax-PrAnd generally has better energy storage performance. The antiferroelectric has a P close to zero due to its special dual hysteresis looprAnd thus is considered to be a material suitable for application to a storage capacitor.
The prior antiferroelectric material applied to the energy storage capacitor is as follows:
lead system-PZT base: such as (Pb)0.955Sr0.015La0.02)(Zr0.75Sn0.195Ti0.055)O3\La-doped PZT
Leadless system-AgNbO3
Lead-containing antiferroelectric materials such as PZT, although having excellent energy storage characteristics, contain a large amount of toxic element lead, and are prone to cause environmental pollution during preparation and subsequent recycling treatment, and thus are restricted or prohibited from being used in various countries around the world.
Lead-free antiferroelectric materialCurrently as AgNbO3Mainly, the energy storage efficiency is usually low (50-70%), and AgNbO is small because the antiferroelectric component can be regulated3The energy storage efficiency of the base energy storage ceramic is difficult to promote. The low energy storage efficiency can cause the device to generate heat seriously in actual use, and threatens the safety and the stability of a power electronic system.
Therefore, those skilled in the art are devoted to develop a novel method for preparing ceramic materials, which is a method for improving the energy storage characteristics of barium titanate-based ceramic through composite doping, wherein the raw materials are nontoxic and environment-friendly, and the method is not easy to cause environmental pollution during preparation and subsequent recovery treatment and has improved energy storage efficiency.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a novel method for preparing a ceramic material, such that the used raw materials are non-toxic and environment-friendly, and the method for improving the energy storage characteristics of barium titanate-based ceramic by composite doping is not easy to cause environmental pollution during preparation and subsequent recovery treatment, and has improved energy storage efficiency.
To achieve the above objects, the present invention provides a method for improving energy storage characteristics of barium titanate-based ceramic using donor-acceptor composite doping, the method comprising the steps of:
s100, weighing BaCO3、TiO2、MnCO3、Nb2O5Mixing the powder with a medium and then grinding to obtain first slurry;
s200, drying the slurry, sieving, and sintering the obtained mixed powder to obtain synthesized first powder;
s300, sieving the powder and grinding to obtain second slurry;
s400, drying and sieving the second slurry, adding PVA (polyvinyl alcohol) glue to obtain second powder with the particle size of 60-100 meshes, and pressing the second powder into a rough blank by using a tablet press;
and S500, sintering the rough blank to obtain a barium titanate-based ceramic sample.
Compared with the prior art, the invention has the advantages that:
(1) the raw materials used in the preparation method are nontoxic and environment-friendly, and the preparation and the subsequent recovery treatment are not easy to cause environmental pollution;
(2) the barium titanate-based ceramic prepared by the preparation method has higher energy storage efficiency which can reach 86%.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a graph comparing the hysteresis loops of a donor-acceptor composite doped barium titanate ceramic and a pure barium titanate ceramic in accordance with a preferred embodiment of the present invention;
figure 2 is a graph of donor-acceptor recombination doping energy storage parameters as a function of acceptor content.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to fig. 1 to 2 of the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The method for improving the energy storage characteristic of barium titanate-based ceramic by using donor-acceptor composite doping comprises the following steps:
s100, weighing BaCO3、TiO2、MnCO3、Nb2O5Mixing the powder with a medium and then grinding to obtain first slurry;
s200, drying the slurry, sieving, and sintering the obtained mixed powder to obtain synthesized first powder;
s300, sieving the powder and grinding to obtain second slurry;
s400, drying and sieving the second slurry, adding PVA (polyvinyl alcohol) glue to obtain second powder with the particle size of 60-100 meshes, and pressing the second powder into a rough blank by using a tablet press;
and S500, sintering the rough blank to obtain a barium titanate-based ceramic sample.
The donor and acceptor elements mentioned herein are not limited to Nb and Mn elements mentioned herein, but may be La, Co, or the like.
On one hand, the raw materials used by the preparation method are nontoxic and environment-friendly, and the preparation and the subsequent recovery treatment are not easy to cause environmental pollution;
on the other hand, the barium titanate-based ceramic prepared by the preparation method has higher energy storage efficiency which can reach 86%.
In a preferred embodiment, the medium in step S100 is alcohol, and the grinding time is 4-5 h.
In a preferred embodiment, the sintering temperature in step S200 is 1100-.
In a preferred embodiment, the grinding time in step S300 is 8-10 h.
In a preferred embodiment, step S500 further includes: and (3) placing the rough blank in a sintering furnace, heating to 1350 ℃ and 1450 ℃ at the heating rate of 80-100 ℃/h, and sintering for 8-10 hours to obtain the barium titanate-based ceramic sample.
The following description is made of specific embodiments of the present invention.