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Metal oxide composite material and preparation method thereof and application of metal oxide composite material

A technology of composite materials and oxides, which is applied in electrical components, battery electrodes, alkaline storage batteries, etc., can solve the problems of easy agglomeration of nano-zinc oxide and uneven modification of metal oxides, so as to achieve slow desorption of hydrogen and passivation, and improve Effect of Cycle Efficiency and Cycle Life

Active Publication Date: 2019-10-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the current phenomenon that nano-zinc oxide is prone to agglomeration and uneven metal oxide modification, the present invention provides a metal oxide composite material and a preparation method thereof. In the process of preparing nano-zinc oxide, metal oxide modification is carried out at the same time , the obtained composite metal oxide is uniformly decorated, moderate in particle size and free from agglomeration

Method used

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  • Metal oxide composite material and preparation method thereof and application of metal oxide composite material

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Experimental program
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Effect test

Embodiment 1

[0033] 1) Weigh 0.75g zinc nitrate hexahydrate, 0.035g stannous chloride dihydrate, 0.015g aluminum chloride and dissolve in 50ml DMF, dissolve 0.2g terephthalic acid, 1gPVP, 40μlTEA in another 50ml DMF .

[0034] 2) Slowly pour the latter solution into the former solution in step 1 and sonicate at 30°C for 15 minutes; the ultrasonic frequency is 30kHz, transfer the obtained mixed solution into a polytetrafluoroethylene liner with a steel shell, and react at 120°C for 8 hours; Cool to room temperature, centrifuge to separate the product, wash with ethanol 3 times, and vacuum dry at 100°C for 12 hours to obtain the precursor;

[0035] 3) The precursor is heated at 4° C. / min to 650° C. for 5 hours under an air atmosphere to obtain the cubic metal oxide composite material with a particle size of 5-50 μm, wherein the metal oxide nanosheets are 50-100 nm in size.

[0036] 4) Mix the nanocomposite material and electrode additives (conductive carbon, sodium carboxymethyl cellulose, ...

Embodiment 2

[0038] 1) Dissolve 0.75g zinc nitrate hexahydrate, 0.05g bismuth nitrate pentahydrate, 0.015g aluminum chloride in 50ml DMF, and dissolve 0.2g terephthalic acid, 1g PVP, 40μl TEA in another 50ml DMF.

[0039] 2) Slowly pour the latter solution into the former solution in step 1 and sonicate at 30°C for 15 minutes; the ultrasonic frequency is 30KHz, transfer the resulting mixed solution into a polytetrafluoroethylene liner with a steel shell, and react at 120°C for 8 hours; After cooling to room temperature, the product was separated by centrifugation, washed 3 times with ethanol, and dried in vacuum at 100°C for 12 hours;

[0040]3) The obtained precursor is heated up to 650° C. for 5 hours at 4° C. / min in an air atmosphere to obtain the cubic metal oxide composite material with a particle size of 5-50 μm, wherein the metal oxide nanosheets are 50-100 nm in size.

[0041] 4) Mix the nanocomposite material and electrode additives (conductive carbon, sodium carboxymethyl cellulo...

Embodiment 3

[0043] Other conditions are the same as in Example 1, except that the added stannous chloride dihydrate in step 1 is changed to 0.02g indium chloride.

[0044] The cycle test of the obtained product shows that after 160 cycles of charging and discharging, the specific capacity is 616.8mAh g-1, and the average Coulombic efficiency is 93.6%.

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Abstract

The invention particularly relates to a metal oxide composite material and a preparation method thereof and application of a metal oxide composite material. The composite material is cubic particles with the granularity of 5-50 [mu]m, and is formed by stacking metal oxide nano sheets with the granularity of 50-100nm. The metal oxide consists of zinc oxide and oxides of metals M1 and M2, wherein the mass percentage of the zinc oxide is 80-95%, the mass percentage of the oxide of the metal M1 is 5-10%, and the mass percentage of the oxide of the metal M2 is 1-5%. The preparation method comprisesthe following steps of: preparing a precursor by adopting a hydrothermal method; and oxidizing the precursor by heat treatment to finally obtain a target material. The material has moderate granularity and no agglomeration phenomenon, and shows excellent cycle efficiency and cycle stability when being used as a cathode material of an alkaline zinc secondary battery. The process is simple, and theobtained product has an excellent performance and is beneficial to the marketization of the zinc secondary battery.

Description

technical field [0001] The invention discloses a metal oxide composite material and its preparation method and application, belongs to the field of secondary batteries, and in particular relates to an alkaline zinc secondary battery negative electrode material and its preparation method and application. Background technique [0002] Alkaline zinc secondary batteries use Zn / ZnO as the negative electrode active material and high-concentration alkaline solution as the electrolyte, which has the characteristics of high specific energy, stable working voltage, safety and environmental protection. However, zinc anode is prone to hydrogen evolution and passivation during the charge-discharge cycle. Both hydrogen evolution reaction and passivation will reduce the Coulombic efficiency of the battery, and the precipitated gas will cause the battery to bulge. In severe cases, it will break through the battery pack and the electrolyte will flow out. directly damage the battery. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/24
CPCH01M4/362H01M4/48H01M4/62H01M4/628H01M10/24Y02E60/10
Inventor 田忠良赖延清罗飞林李松贤杨凯
Owner CENT SOUTH UNIV
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