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High performance environment-friendly capacitor dielectric and preparation method thereof

A capacitor and high-performance technology, applied in the field of capacitors, can solve the problem of low efficiency and achieve the effects of high production efficiency, improved energy storage efficiency, and compact structure

Active Publication Date: 2018-12-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there has been a lot of research on new lead-free capacitor materials, mainly including doped BaTiO 3 (BT)-based ceramics and thick film research, lead-free BiFeO 3 Based solid solution relaxation ferroelectric dielectric research, but each has its limitations
Among them, BaTiO 3 (BT)-based ceramics as an example, the highest energy storage density reported for this type of material is only 1.2J / cm 3 , the efficiency is not high, and the pressure resistance and energy storage efficiency are the bottlenecks of its development

Method used

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  • High performance environment-friendly capacitor dielectric and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method steps of the high-performance environment-friendly capacitor dielectric of the present embodiment are as follows:

[0037] Step 1: Preparation of Bi 0.83 SM 0.17 Fe 0.95 sc 0.05 o 3 (BSFSO) powder.

[0038] In this example, the total amount of the obtained BSFSO powder is 0.08mol, and the raw materials for the preparation of the BSFSO powder are shown in Table 1:

[0039] Table 1 Preparation raw materials of BSFSO powder

[0040] Drug Name

molecular weight

Drug purity

Experimental ratio

stoichiometric number

Weighing quality

bismuth trioxide

465.96

0.9999

1

0.83

15.4714g

Samarium trioxide

348.7

0.9999

1

0.17

2.3714g

Ferric oxide

159.69

0.999

1

0.95

6.0742g

scandium trioxide

137.91

0.999

1

0.05

0.2760g

[0041] Specific steps are as follows:

[0042] 1) Take each raw material according to the weighing quality in Table 1; ...

Embodiment 2

[0057] The preparation method of the high-performance environment-friendly capacitor dielectric of this embodiment is basically the same as that of Embodiment 1, the difference lies in the following two points:

[0058] ① Step 3 and step 4) During the hot pressing sintering process, through the cooperation of two experimenters, the sintering temperature was first raised to three different temperatures of 860°C, 840°C, and 820°C, and then kept for 5 minutes, and then obtained after cooling down. Three BSFSO ceramic samples prepared at different sintering temperatures.

[0059] ② Step 2 of Step 4) When plating the top electrode, the diameter of the hole on the mask used is 1mm.

Embodiment 3

[0061] The high-performance environment-friendly capacitor dielectric that embodiment 1 and embodiment 2 make, i.e. the performance of BSFSO ceramics (samarium scandium co-doped BFO ceramics) is tested and characterized:

[0062] (1) XRD diffraction test

[0063] see figure 1 , which is the XRD diffraction diagram of the BSFSO ceramic sample and the pure BFO ceramic sample, the curve 1 in the figure is the XRD diffraction diagram of the BSFSO ceramic, and the curve 2 is the XRD diffraction diagram of the pure BFO ceramic. This test result is obtained by X-ray diffractometer (X'Pert PRO, PANalytical) to the BSFSO ceramics test that embodiment 1 makes. From figure 1 It can be seen from the figure that BSFSO ceramics can form independent phases without other impurity phases.

[0064] (2) SEM section characterization

[0065] see figure 2 , which is the SEM cross-sectional characterization diagram and partial enlarged diagram of the BSFSO ceramic sample. The test results are...

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Abstract

The invention relates to a high performance environment-friendly capacitor dielectric and a preparation method thereof. The high performance environment-friendly capacitor dielectric is prepared by hot pressed sintering of a ferroelectric material, which is samarium-scandium co-doped bismuth ferrite and has a chemical composition of Bi0.83Sm0.17Fe0.95Sc0.05O3. The preparation method comprises thesteps of: preparing Sm and Sc co-doped BiFeO3 powder by ball milling; drying and grinding the powder, then conducting pre-sintering, and then performing secondary ball milling; and then conducting hotpressed sintering to obtain Bi0.83Sm0.17Fe0.95Sc0.05O3 ceramic, and carrying out cutting, rubbing and polishing to obtain the high performance environment-friendly capacitor dielectric. The high performance environment-friendly capacitor dielectric effectively improves the disadvantages of poor voltage resistance and high leakage current in pure BiFeO3, and greatly improves the energy storage density and energy storage efficiency of the capacitor dielectric, the energy storage density and energy storage efficiency are 2.21J / cm<3> and 76% respectively, and the performance of the capacitor dielectric is superior to other lead-free BiFeO3-based energy storage materials. The preparation method has the advantages of simple process, high production efficiency and easy control.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to a high-performance environment-friendly capacitor dielectric and a preparation method thereof. Background technique [0002] Energy storage materials play an important role in modern electronic and electrical systems, and are widely used in various energy storage components, such as dielectric capacitors, electrochemical capacitors, batteries (lithium-ion batteries, fuel cells), etc. These three types of components have their own characteristics. For example, the battery has the highest energy storage density, but the charging and discharging speed is slow and the power density is the lowest. It is suitable for devices that provide long-lasting and stable electric energy; the dielectric capacitor has the highest power density among the three and can be charged instantly. , suitable for pulsed high-power electrical energy equipment; electrochemical capacitors are in between. However, cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/626H01G4/12
CPCC04B35/50C04B35/62615C04B2235/3272C04B2235/3298C04B2235/95H01G4/1209
Inventor 曾敏高贤禄陆旭兵高兴森刘俊明
Owner SOUTH CHINA NORMAL UNIVERSITY
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