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a flower cluster li 2 the si 2 o 5 Powder preparation method

A flower cluster and powder technology, applied in the direction of alkali metal silicate, silicate, etc., can solve the problems of physical and chemical properties and applications to be discovered, and achieve the effect of complete crystal phase, uniform size and high purity

Active Publication Date: 2017-04-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently about pure phase Li 2 Si 2 o 5 There are few research reports on materials, and their physical and chemical properties and applications are yet to be discovered

Method used

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  • a flower cluster li <sub>2</sub> the si <sub>2</sub> o <sub>5</sub> Powder preparation method
  • a flower cluster li <sub>2</sub> the si <sub>2</sub> o <sub>5</sub> Powder preparation method
  • a flower cluster li <sub>2</sub> the si <sub>2</sub> o <sub>5</sub> Powder preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] step one:

[0027] Ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) into a certain amount of deionized water with a concentration of 0.1mol / L to obtain solution A; drop hydrochloric acid into solution A to make the pH value 0.5, heat at 60°C, and stir rapidly for 0.5h to make ethyl orthosilicate Fully hydrolyzed to obtain ethyl orthosilicate solution;

[0028] Step two:

[0029] LiOH·2H 2 O is added to a certain amount of deionized water, the concentration is 1mol / L, stirred until dissolved, and LiOH·2H 2 O solution;

[0030] Step three:

[0031] LiOH·2H in step 2 2 Add the O solution to the tetraethyl tetrasilicate solution in step 1, stir and mix evenly to obtain a mixed solution; in the mixed solution, the molar ratio of Li and Si is 1:1, and the total concentration of Li and Si is 0.1mol / L ;

[0032] Step four:

[0033] Transfer the mixed solution in step 3 into a hydrothermal reaction kettle and react at 150°C for 30 hours; after the reaction is completed and cool...

Embodiment 2

[0039] step one:

[0040] Ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) into a certain amount of deionized water with a concentration of 1.0mol / L to obtain a solution A; drop hydrochloric acid into the solution A to make the pH value 2, heat at 70°C, and stir rapidly for 1 hour to make the ethyl orthosilicate fully Hydrolyzed to obtain ethyl orthosilicate solution;

[0041] Step two:

[0042] LiOH·2H 2 O is added into a certain amount of deionized water, the concentration is 3mol / L, and stirred until dissolved to obtain LiOH 2H 2 O solution;

[0043] Step three:

[0044] LiOH·2H in step 2 2 The O solution is added to the tetraethyl orthosilicate solution in step 1, stirred and mixed evenly to obtain a mixed solution; in the mixed solution, the molar ratio of Li and Si is 2.5:1, and the total concentration of Li and Si is 0.5mol / L ;

[0045] Step four:

[0046] Transfer the mixed solution in step 3 into a hydrothermal reaction kettle, and react at 200°C for 10 hours; after ...

Embodiment 3

[0052] step one:

[0053] Ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) into a certain amount of deionized water with a concentration of 0.5mol / L to obtain a solution A; drop hydrochloric acid into the solution A to make the pH value 1.5, heat at 65°C, and stir rapidly for 1 hour to make the ethyl orthosilicate fully Hydrolyzed to obtain ethyl orthosilicate solution;

[0054] Step two:

[0055] LiOH·2H 2 O is added to a certain amount of deionized water, the concentration is 2mol / L, stirred until dissolved, and LiOH·2H 2 O solution;

[0056] Step three:

[0057] LiOH·2H in step 2 2 O solution was added in the tetraethyl orthosilicate solution in step 1, stirred and mixed uniformly to obtain a mixed solution; in the mixed solution, the molar ratio of Li and Si was 2:1, and the total concentration of Li and Si was 0.45mol / L;

[0058] Step four:

[0059] Transfer the mixed solution in step 3 into a hydrothermal reaction kettle, and react at 180°C for 24 hours; after the reacti...

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Abstract

The invention provides a preparation method for flowerlike Li2Si2O5 powder. The preparation method comprises the following steps: adding ethyl orthosilicate into ionized water, then adding hydrochloric acid and carrying out heating and stirring; adding LiOH.2H2O into ionized water; mixing two mixtures obtained in the previous two steps; putting the obtained mixture in a hydro-thermal reaction vessel for high temperature reaction; carrying out cooling, collection and drying; and then carrying out calcining and high temperature reaction again and then carrying out cooling in a furnace. According to the invention, a hydrothermal method is employed; and the obtained powder has completely developed crystal phase and high purity, a single crystal grain is in a one-dimensional whisker shape and has a uniform size, and flowerlike morphology is formed after assembling one-dimensional whiskers.

Description

technical field [0001] The invention belongs to functional material Li 2 Si 2 o 5 The technical field of powder preparation, in particular to a flower cluster Li 2 Si 2 o 5 Powder preparation method. Background technique [0002] The combination of metal lithium ions and silicates can form a series of lithium silicate compounds with different compositions. The known lithium silicates are as follows: Lithium monosilicate (Li 8 SiO 6 , Li 4 SiO 4 ), lithium disilicate (Li 2 SiO 3 , Li 6 Si 2 o 7 and Li 2 Si 2 o 5 ) and lithium pentasilicate (Li 2 Si 5 o 11 ). Lithium silicate with different compositions has different uses, for example, Li 4 SiO 4 Can be used to absorb CO 2 The adsorbent, Li 2 SiO 3 Can be used as a solid-state electrolyte for high energy density batteries, while Li 2 Si 2 o 5 is the Li used in dental restorations 2 O-SiO 2 -P 2 o 5 It is the main ingredient in glass-ceramics. Currently about pure phase Li 2 Si 2 o 5 There a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32
Inventor 夏傲谈国强
Owner SHAANXI UNIV OF SCI & TECH