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Method for preparing shape-controllable CaTiO3 ceramic applied for energy storage by sol-gel method

A gel method and sol technology, which is applied in the field of preparation of high energy storage density CaTiO3 fine-grained ceramics, can solve problems such as excessive heat treatment temperature, impurity pollution, and large ceramic grains, so as to reduce sintering time and temperature, reduce The effect of energy consumption

Active Publication Date: 2018-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the CaTiO obtained by this method 3 There are some problems in the powder: such as too high heat treatment temperature, too large ceramic grains, uneven particle size distribution and contamination by impurities

Method used

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  • Method for preparing shape-controllable CaTiO3 ceramic applied for energy storage by sol-gel method
  • Method for preparing shape-controllable CaTiO3 ceramic applied for energy storage by sol-gel method
  • Method for preparing shape-controllable CaTiO3 ceramic applied for energy storage by sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Taking the preparation of nano-powder with 0.5 times the concentration of the precursor as an example, the required raw materials are 42.545 grams of butyl titanate, 29.52 grams of calcium nitrate tetrahydrate, 1 gram of concentrated nitric acid, 25 mL of acetic acid, 150 mL of absolute ethanol, and 0.25 grams of PEG-1000 . The specific operation is as follows:

[0034] 1. At room temperature, 42.545 grams of butyl titanate Ti(OC 4 h 9 ) 4 Dissolve in 75mL of absolute ethanol, stir continuously, and then slowly drop 0.75g of concentrated nitric acid with a concentration of 65% to 68% to form a yellow transparent butyl titanate absolute ethanol solution;

[0035] 2. 29.52 grams of calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 O mixed with 75mL of absolute ethanol, stirred, and heated to 60°C to promote the dissolution of calcium nitrate;

[0036]3. Slowly add the calcium nitrate dehydrated ethanol solution prepared in step 2 to the butyl titanate dehydrated ethano...

Embodiment 2

[0041] Taking the preparation of nano-powder with 1.0 times the concentration of the precursor as an example, the required raw materials are 42.545 grams of butyl titanate, 29.52 grams of calcium nitrate tetrahydrate, 1 gram of concentrated nitric acid, 25 mL of acetic acid, 75 mL of absolute ethanol, and 0.25 grams of PEG-1000 . The specific operation is as follows:

[0042] 1. At room temperature, 42.545 grams of butyl titanate Ti(OC 4 h 9 ) 4 Dissolve in 37.5mL of absolute ethanol, stir continuously, and then slowly drop 0.75g of concentrated nitric acid with a concentration of 65% to 68% to form a yellow transparent butyl titanate absolute ethanol solution;

[0043] 2. 29.52 grams of calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 O mixed with 37.5mL of absolute ethanol, heated to 60°C to promote the dissolution of calcium nitrate;

[0044] 3. Slowly add the calcium nitrate dehydrated ethanol solution prepared in step 2 to the butyl titanate dehydrated ethanol solutio...

Embodiment 3

[0049] Taking the preparation of nano-powder with 1.5 times the concentration of the precursor as an example, the required raw materials are 42.545 grams of butyl titanate, 29.52 grams of calcium nitrate tetrahydrate, 1 gram of concentrated nitric acid, 25 mL of acetic acid, 50 mL of absolute ethanol, and 0.25 grams of PEG-1000 . The specific operation is as follows:

[0050] 1. At room temperature, 42.545 grams of butyl titanate Ti(OC 4 h 9 ) 4 Dissolve in 25mL of absolute ethanol, stir continuously, and then slowly drop 0.75g of concentrated nitric acid with a concentration of 65% to 68% to form a yellow and transparent butyl titanate absolute ethanol solution;

[0051] 2. 29.52 grams of calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 O mixed with 25mL of absolute ethanol, stirred, and heated to 60°C to promote the dissolution of calcium nitrate;

[0052] 3. Slowly add the calcium nitrate dehydrated ethanol solution prepared in step 2 to the butyl titanate dehydrated et...

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Abstract

The invention discloses a method for preparing shape-controllable CaTiO3 ceramic applied for energy storage by a sol-gel method. The method comprises the following steps: in a preparation process, mixing tetrabutyl titanate and absolute ethyl alcohol, stirring, dropwise adding concentrated nitric acid slowly, and forming butyl titanate absolute ethyl alcohol solution; dropwise adding mixed solution of calcium nitrate tetrahydrate and the absolute ethyl alcohol to the butyl titanate absolute ethyl alcohol solution, and dropwise adding the concentrated nitric acid and acetic acid to adjust a pHvalue of the mixed solution, adding PEG-1000 to the mixed solution, uniformly stirring and mixing, after a water bath reaction, to obtain transparent gel; drying the gel, and calcining; controlling the size of nano particles through changing a reaction precursor concentration and a calcining temperature; and grinding, sieving, pelleting, tableting, plastic-removing, and sintering nano powder prepared by the calcination, to obtain the CaTiO3 fine-grain ceramic. In the process of preparing the CaTiO3 fine-grain ceramic, a poisonous chemical reagent is not involved, the operation flow is simple,and the preparation cost is low. The obtained fine-grain ceramic has the energy storage density higher than a document value, and can be extensively applied to the energy storage field.

Description

technical field [0001] The present invention relates to CaTiO 3 In the field of energy storage technology, especially the preparation of nano powders with controllable morphology and sintering to obtain high energy storage density CaTiO 3 Preparation method of fine-grained ceramics. Background technique [0002] The energy storage properties required by suitable dielectric materials are usually satisfied as follows: large saturation polarization (Ps), small remnant polarization (Pr) and high electrical breakdown field strength (BDS) to achieve high energy density and low energy loss. CaTiO 3 Is a typical linear dielectric material, energy density and dielectric constant and dielectric strength (E b ) is proportional to the square, with relatively good dielectric properties and high dielectric constant. Improve the dielectric strength (E b ) to increase the energy storage density is the most effective. With regard to the improvement of dielectric strength through the m...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/624
CPCC04B35/465C04B35/624C04B2235/3208
Inventor 吴淑雅赵妍刘小强陈湘明
Owner ZHEJIANG UNIV
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