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Magnesium compound material and preparation method and application thereof

A magnesium compound and compound technology, applied in the field of materials, can solve the problem of easy precipitation of metal lithium on the negative electrode

Inactive Publication Date: 2020-11-06
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when lithium-ion batteries are charged and discharged at a large flow rate, lithium metal is easily precipitated from the negative electrode. Therefore, people are urgently looking for a secondary battery with better safety and higher energy density.

Method used

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  • Magnesium compound material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] MgO, CuCO 3 and NiO are dispersed in ethanol solvent, stirred in the beaker for 4 hours, after the stirring is stopped, add the sedimentation aid NH 4 HCO 3 , get the precipitate;

[0056] Vacuum dry the precipitate in an oven at 120°C for 12 hours; the powder obtained by oven drying is calcined at 1000°C for 20 hours under a nitrogen protective atmosphere, and the material obtained after cooling is dispersed in a deionized aqueous solution, and then titanium oxide is added for dispersion. The magnesium compound material is obtained by spray drying. The magnesium compound material is MgCu coated with titanium oxide 0.5 Ni 0.5 o 2 .

[0057] The synthesized magnesium compound material was uniformly mixed with acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1 to make a research electrode. The research electrode is used as the positive electrode, metal magnesium is used as the negative electrode, polyethylene (PE) film is used as the diaphragm, an...

Embodiment 2

[0059] Accurately weigh 0.1mol MgO, 1mol MnO and 0.1mol NiO and mix them evenly, put them into the agate tank of the planetary ball mill, add absolute ethanol as the mixing medium, and fully ball mill with agate balls for 4 hours; then dry at 120°C Finally, put the powder in a tube furnace and heat it to 400°C at a heating rate of 3°C / min under the protection of high-purity nitrogen, keep it for 1 hour, continue to heat up to 1200°C, and keep it for 15 hours; the obtained product is deionized After washing with water, put it into a vacuum drying oven, dry it at 80°C for 12 hours, and grind the dried product into powder to obtain the magnesium compound material Mg 2 NiMnO 4 .

[0060] The synthesized magnesium compound material Mg 2 NiMnO 4 Mix it with acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1 to make a research electrode. The research electrode was used as the positive electrode, the lithium sheet was used as the negative electrode, the PE film w...

Embodiment 3

[0062] Add MgO, CuO and vanadium oxide to the deionized water solvent according to the mass fraction ratio of 1:1:0.5, uniformly disperse through polyethylene glycol, and adjust the pH value of the system to 8, so that vanadium oxide is evenly adsorbed on MgO, CuO materials On the particles; calcined at 1100°C for 20 hours under a protective atmosphere, and the magnesium compound material obtained after cooling is MgCuO coated with vanadium oxide 2 .

[0063] The synthesized vanadium oxide-coated MgCuO 2 Mix it with acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1 to make a research electrode. The research material was used as the positive electrode, metal magnesium was used as the negative electrode, PE film was used as the diaphragm, and 0.25mol / L Mg(AlCl 2 BuEt) 2 / THF is the electrolyte, and it is assembled into a CR2032 button cell in a glove box. The charge and discharge current is 0.2C, discharge to 20mV, and then cycle 50 times. The first disch...

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Abstract

The invention relates to a magnesium compound material and a preparation method and application thereof, the magnesium compound material comprises MgxMyO2, M comprises one or more of Cu, Ni, Zn, Ti, Mn or Fe, X is greater than or equal to 0.1 and less than or equal to 2, and Y is greater than or equal to 0.1 and less than or equal to 2; the pH value of the magnesium compound material is 7-9; the magnesium compound material is one or more of a spherical shape, an ellipsoidal shape, a cobblestone shape or an irregular shape; and the magnesium compound material is used as a secondary battery positive electrode material or an active material additive for a secondary battery positive electrode.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a magnesium compound material and a preparation method and application thereof. Background technique [0002] Batteries are widely used in today's society, among which lithium-ion batteries have attracted the attention of scholars because of their high energy density. However, when a lithium-ion battery is charged and discharged at a large flow rate, lithium metal is easily precipitated from the negative electrode. Therefore, people are urgently looking for a secondary battery with better safety and higher energy density. [0003] Magnesium is an active metal, the content of magnesium in the earth's crust ranks fifth, the density is 1.74g / cm3, and it has good thermal and electrical conductivity. Magnesium is not as lively as lithium, easy to operate, good in safety, low in price (1 / 24 of Li), non-polluting and does not produce dendrites in the magnesium negative electrode, Mg ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/505H01M4/525H01M4/485H01M10/054Y02E60/10
Inventor 闫昭李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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