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High-energy-storage-density lead-free high-entropy perovskite ceramic, preparation method and capacitor

A high energy storage density, perovskite technology, applied in capacitors, fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of lead-free energy storage ceramic energy storage density and energy storage efficiency need to be improved, biological and environmental hazards, etc. Achieve good energy storage efficiency, environmental friendliness, and reduce the effect of reducing polarization performance.

Active Publication Date: 2022-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lead-containing perovskite ceramic dielectric materials have excellent performance, they are harmful to biology and the environment. Some countries and regions (such as the European Union and Japan) have passed legislation to prohibit or restrict the use of harmful lead elements, so lead-free energy storage dielectrics Research is also imperative
[0006] However, the energy storage density and energy storage efficiency of lead-free energy storage ceramics still need to be improved

Method used

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  • High-energy-storage-density lead-free high-entropy perovskite ceramic, preparation method and capacitor
  • High-energy-storage-density lead-free high-entropy perovskite ceramic, preparation method and capacitor
  • High-energy-storage-density lead-free high-entropy perovskite ceramic, preparation method and capacitor

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preparation example Construction

[0050] The preparation method according to the embodiment of the present invention comprises the following steps:

[0051] Step 1, Preparation of Sr(Mg 1 / 3 Nb y Ta 2 / 3-y )O 3 Powder, where 0≤y≤2 / 3.

[0052] That is, firstly, Sr(Mg) as an introduced end member was prepared 1 / 3 Nb y Ta 2 / 3-y )O 3 powder.

[0053] Specifically, the step 1 may include:

[0054] Stoichiometric weighing of SrCO 3 , MgO, Nb 2 O 5 and / or Ta 2 O 5 ;

[0055] the SrCO 3 , MgO and Nb 2 O 5 and / or Ta 2 O 5 The Sr(Mg 1 / 3 Nb y Ta 2 / 3-y )O 3 powder.

[0056] Step 2, Weigh Bi 2 O 3 , Na 2 CO 3 , K 2 CO 3 , BaCO 3 , TiO 2 , and Sr(Mg 1 / 3 Nb y Ta 2 / 3-y )O 3 Powder, according to (1-x)Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -xSr(Mg 1 / 3 Nb y Ta 2 / 3-y )O 3 The stoichiometric ratio of 0<x≤0.20 is mixed to obtain mixed powder.

[0057] That is to say, after mixing to obtain the powder into which the endmember is introduced, each component constituting the matrix and the endmembe...

Embodiment 1

[0086] Example 1 0.96Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.04Sr(Mg 1 / 3 Nb 2 / 3 )O 3 (ie x=0.04) Preparation of High-Entropy Perovskite Ceramics

[0087] 1. Preparation of Sr(Mg 1 / 3 Nb 2 / 3 )O 3 powder.

[0088] Weigh SrCO separately according to the stoichiometric proportion 3 , MgO and Nb 2 O 5 The raw materials are put into the ball mill tank, and the ball mill is fully mixed for 12 hours.

[0089] 2. According to 0.96Bi 0.4 Na0.2 K 0.2 Ba 0.2 TiO 3 -0.04Sr(Mg 1 / 3 Nb 2 / 3 )O 3 Stoichiometric ratio of ceramics, weighed Bi 2 O 3 , Na 2 CO 3 , K 2 CO 3 , BaCO 3 , TiO 2 and Sr(Mg 1 / 3 Nb 2 / 3 )O 3 , after ball milling for 12 hours to mix evenly, then dried and passed through a 60-mesh sieve. Then, the mixed powder was put into a crucible and pre-fired at 850°C for 3 hours.

[0090] 3. Pulverize the blocks formed after pre-sintering and perform secondary ball milling. After taking out the slurry, it is dried and passed through a 60-mesh sieve to obtain ...

Embodiment 2-5、 comparative example 1

[0094] except (1-x)Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -xSr(Mg 1 / 3 Nb 2 / 3 )O 3 In, Sr(Mg 1 / 3 Nb 2 / 3 )O 3 Component ceramics were prepared in the same manner as in Example 1 except that the content of end members was as shown in Table 1 below.

[0095] Table 1 Chemical composition of Examples 1-5 and Comparative Example 1

[0096] x value chemical components Example 1 0.04 0.96Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.04Sr(Mg 1 / 3 Nb 2 / 3 )O 3

Example 2 0.08 0.92Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.08Sr(Mg 1 / 3 Nb 2 / 3 )O 3

Example 3 0.12 0.88Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.12Sr(Mg 1 / 3 Nb 2 / 3 )O 3

Example 4 0.16 0.84Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.16Sr(Mg 1 / 3 Nb 2 / 3 )O 3

Example 5 0.20 0.80Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3 -0.20Sr (Mg 1 / 3 Nb 2 / 3 )O 3

Comparative Example 1 0 Bi 0.4 Na 0.2 K 0.2 Ba 0.2 TiO 3

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Abstract

The invention provides a lead-free high-entropy perovskite ceramic with high energy storage density, a preparation method and a capacitor. The preparation method comprises the following steps that 1, Sr (Mg1 / 3NbyTa2 / 3-y) O3 powder is prepared, and y is larger than or equal to 0 and smaller than or equal to 2 / 3; 2, Bi2O3, Na2CO3, K2CO3, BaCO3, TiO2 and Sr (Mg < 1 / 3 > N < y > Ta < 2 / 3-y >) O3 powder are weighed, proportioning and mixing are conducted according to the stoichiometric ratio of (1-x) Bi < 0.4 > Na < 0.2 > K < 0.2 > Ba < 0.2 > TiO < 3-x > Sr (Mg < 1 / 3 > N < y > Ta < 2 / 3-y >) O3, x is less than or equal to 0.20; step 3, pre-sintering the mixed powder at the temperature of 700 to 1000 DEG C, and crushing to obtain ceramic powder; step 4, molding by utilizing the ceramic powder to obtain a ceramic green body; and step 5, sintering the ceramic body at the temperature of 1000 to 1200 DEG C, so as to obtain the lead-free high-entropy perovskite ceramic with high energy storage density. According to the preparation method disclosed by the embodiment of the invention, the ceramic is prepared by adopting a solid-phase reaction method, and the preparation method has the advantages of simple process and low cost; due to the introduced Sr (Mg1 / 3NbyTa2 / 3-y) O3 end member, the number of cations is further increased, and finally, the ceramic can give consideration to high energy storage density and high energy storage efficiency.

Description

technical field [0001] The invention relates to the technical field of dielectric energy storage ceramics, in particular to a lead-free high-entropy perovskite ceramic with high energy storage density, a preparation method and a capacitor. Background technique [0002] Modern life is inseparable from electric energy. The electrification of human society is getting higher and higher. The acquisition, utilization and storage of electric energy is an extremely important topic. From the acquisition to the efficient utilization of electric energy, the corresponding power electronic equipment is inseparable. Capacitors are extremely important devices in power electronics, capable of physically storing and releasing electrical energy. In electronic circuits, one of the important functions of capacitors is to store electrical energy quickly and release it in a short time, so it has a wide range of applications. For example, in rail transit, the huge energy generated during regener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622H01G4/12
CPCC04B35/475C04B35/622H01G4/1227C04B2235/3206C04B2235/3213C04B2235/3255C04B2235/3201C04B2235/3215C04B2235/6562C04B2235/6567C04B2235/768Y02E60/50Y02E60/13
Inventor 陈克丕严博
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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