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Preparation method of spinel type lithium manganate

A type of lithium manganate and spinel technology, applied in the field of preparation of spinel type lithium manganate, can solve the problems of long reaction time and unfavorable industrial promotion and application

Inactive Publication Date: 2010-03-03
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantages of simple process and easy control of preparation conditions, the reaction time is too long, which is not conducive to industrial application.

Method used

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  • Preparation method of spinel type lithium manganate
  • Preparation method of spinel type lithium manganate
  • Preparation method of spinel type lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] The embodiment of the preparation method of a spinel lithium manganate of the present invention comprises:

[0036] Load lithium salt and manganese salt on the surface of carbon particles;

[0037] The carbon particles loaded with lithium salt and manganese salt are calcined.

[0038] According to the present invention, the manganese salt may refer to any manganese salt known to those skilled in the art, preferably one or more of manganese nitrate, manganese chloride, manganese acetate, manganese sulfate or manganese carbonate, but not limited thereto. The lithium salt may refer to any lithium salt known to those skilled in the art, preferably one or more of lithium nitrate, lithium chloride, lithium acetate, lithium sulfate or lithium carbonate, but is not limited thereto. The carbon particles refer to simple carbon particles well known to those skilled in the art, and specific examples are preferably one or more of carbon black, activated carbon powder, coke powder, ...

Embodiment 1

[0052] Weigh 0.850g LiCl solid and put it into a 100ml beaker, then add about 3.616g of mass fraction of 50% Mn(NO 3 ) 2 solution, shake well to dissolve the LiCl solid to obtain a mixed solution;

[0053] Add 0.25g of acetylene black (provided by Tianjin Lihuajin Chemical Co., Ltd., with a particle size of 35nm to 40nm and quality standards in line with GB / T3782-2006) into the mixed solution, and stir evenly;

[0054] The beaker was placed in an electric constant temperature blast drying oven at 70°C for 4 hours;

[0055] After drying, the loaded LiCl and Mn(NO 3 ) 2 The acetylene black was transferred to a corundum crucible, and then the corundum crucible was put into an electric heating furnace, and fired under normal pressure in an air atmosphere, the firing temperature was 600° C., and the firing time was 1 h.

[0056] After roasting, cool the crucible to 50° C. in an electric heating furnace to take out the roasted product, add deionized water to dissolve, wash and f...

Embodiment 2

[0060] with LiNO 3 and MnCl 2 As a raw material, use water as a solvent to prepare 50ml of LiNO with a concentration of 0.02mol / L 3 and 0.01mol / L MnCl 2 mixed solution;

[0061] Add the acetylene carbon black of 0.5g to the mixed solution and then stir evenly, and the source of acetylene carbon black is the same as in Example 1;

[0062] Dry the solution at 65° C. for 4 hours in a blast drying oven to remove water;

[0063] After drying, the loaded LiNO 3 and MnCl 2 The acetylene black was transferred to the crucible, and then roasted under normal pressure in an electric heating furnace, the roasting temperature was 700°C, and the roasting time was 2h;

[0064] Cool the roasted product in the electric heating furnace to 50°C, take it out, add deionized water to dissolve, wash, filter, and dry at 70°C for 2 hours to obtain a black solid powder with a powder particle size of about 400nm;

[0065] Get described black solid powder and measure with Phillips X'Pert Pro MPD X-...

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Abstract

The invention discloses a preparation method of spinel type lithium manganate, comprising the following steps of: leading lithium salt and manganese salt to be loaded on the surface of carbon particles; and roasting the carbon particles loaded with lithium salts and manganese salts. Compared with the solid-phase reaction method in the prior art, the preparation method adopts carbon particles as reacting carriers, thus greatly shortening reaction time and reducing reaction temperature; and the result shows that the spinel type lithium manganate crystal with high purity and good particle appearance is prepared.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a method for preparing spinel lithium manganate. Background technique [0002] Spinel lithium manganese oxide (LiMn 2 o 4 ) The main structure is composed of regular cubic close-packed oxygen ions, lithium ions and manganese ions occupy the tetrahedral and octahedral voids, respectively. Its simplest form is LiMn 2 o 4 , in fact the complete unit cell form of the crystal is Li 8 mn 16 o 32 ,have (No.227) space group, 32 oxygen ions occupy the 32e position of the cube, and they do cubic close packing (FCC), forming 64 tetrahedral gaps and 32 octahedral gaps. Lithium ions occupy 1 / 8 of the tetrahedral gap and occupy the 8a position. On the whole, lithium ions are distributed in the three-dimensional channels around the manganese-oxygen octahedron. This spinel structure is conducive to the intercalation and extraction of lithium ions, thereby ensuring its migration in th...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 杨晓晶阮杰肖家文胡伟超刘佐军
Owner BEIJING NORMAL UNIVERSITY
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