A kind of 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 problems of low efficiency and achieve the effects of high production efficiency, improved withstand voltage performance, and large energy storage density

Active Publication Date: 2021-10-08
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high-performance environment-friendly capacitor dielectric and preparation method thereof
  • A kind of high-performance environment-friendly capacitor dielectric and preparation method thereof
  • A kind of high-performance environment-friendly capacitor dielectric and preparation method thereof

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Experimental program
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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;

[0043] 2) Put the weighed raw materials into the nylon ...

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 made of a ferroelectric material hot-pressed and sintered. The ferroelectric material is samarium scandium co-doped bismuth ferrite, and its chemical composition is Bi 0.83 SM 0.17 Fe 0.95 sc 0.05 o 3 . The preparation method comprises the following steps: preparing Sm and Sc co-doped BiFeO by ball milling 3 Powder; after drying and grinding the powder, pre-sintering, after pre-sintering, secondary ball milling; then hot pressing and sintering to obtain Bi 0.83 SM 0.17 Fe 0.95 sc 0.05 o 3 Ceramics, after cutting, grinding and polishing, obtain high-performance and environmentally friendly capacitor dielectrics. The high-performance environmentally friendly capacitor dielectric of the present invention effectively improves pure BiFeO 3 The shortcomings of poor voltage resistance and large leakage current have greatly improved the energy storage density and energy storage efficiency of the capacitor dielectric, and its energy storage density and energy storage efficiency are respectively 2.21J / cm 3 , 76%, outperforms other lead-free BiFeO 3 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 Patents(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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