Zinc oxide microsphere, electrode and preparation method thereof

A zinc oxide micron, zinc oxide technology, applied in the field of lithium-ion batteries, can solve the problem of low capacity growth, and achieve the effect of improving cycle life, increasing contact area, and excellent cycle performance

Active Publication Date: 2021-07-20
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The negative electrode material is the key to determine the future development of lithium-ion batteries, and the traditional graphite negative electrode material has a low capacity (372mAh g -1 ) has been unable to meet the growing needs of the people

Method used

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  • Zinc oxide microsphere, electrode and preparation method thereof
  • Zinc oxide microsphere, electrode and preparation method thereof
  • Zinc oxide microsphere, electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation method of zinc oxide hollow microspheres comprises the steps:

[0027] 1) Preparation of mixed solution: ultrasonically mix 0.20 mmol of zinc acetate dihydrate and 21 mL of isopropanol, then add 3 mL of glycerol, and mix uniformly by magnetic stirring to obtain a mixed solution; zinc acetate dihydrate is uniformly dispersed in the mixed solution ;

[0028] 2) Preparation of zinc-glycerate by mixed liquid reaction: Pour the mixed liquid into a reaction kettle, place it in an oven at 180°C for 2 hours, then cool the reaction kettle to room temperature, obtain a precipitate by centrifugation, and wash with absolute ethanol for 5 Remove the unreacted alcohols for the first time, and then put it into a 70°C oven to dry to obtain zinc glycerate;

[0029] 3) Zinc glycerate is calcined to prepare zinc oxide microspheres: Zinc glycerate is used as a precursor, put in a porcelain boat and placed in a tube furnace, and the temperature is raised at a ...

Embodiment 2

[0038] Embodiment 2: the preparation method of zinc oxide solid microsphere, comprises the steps:

[0039] 1) Preparation of mixed solution: ultrasonically mix 0.25 mmol of zinc acetate dihydrate and 20 mL of isopropanol, then add 4 mL of glycerol, and mix uniformly by magnetic stirring to obtain a mixed solution; zinc acetate dihydrate is uniformly dispersed in the mixed solution ;

[0040] 2) Preparation of zinc-glycerate by mixed liquid reaction: Pour the mixed liquid into a reaction kettle, place it in an oven at 180°C for 6 hours, then cool the reaction kettle to room temperature, obtain a precipitate by centrifugation, and wash 5 times with absolute ethanol The unreacted alcohols were removed, and then put into an oven at 70° C. to dry to obtain zinc glyceric acid salt.

[0041] 3) Zinc glycerate was calcined to prepare zinc oxide microspheres: take the prepared zinc glycerate as a precursor, put it into a porcelain boat and place it in a tube furnace, and heat it at 2°...

Embodiment 3

[0050] Embodiment 3: the preparation method of zinc oxide solid microspheres, it comprises the steps:

[0051] 1) Preparation of mixed solution: ultrasonically mix 0.15 mmol of zinc acetate dihydrate and 20 mL of isopropanol, then add 4 mL of glycerol, and mix uniformly by magnetic stirring to obtain a mixed solution; zinc acetate dihydrate is uniformly dispersed in the mixed solution ;

[0052] 2) Preparation of zinc-glycerate by mixed liquid reaction: Pour the mixed liquid into a reaction kettle, place it in an oven at 180°C for 6 hours, then cool the reaction kettle to room temperature, obtain a precipitate by centrifugation, and wash with absolute ethanol for 5 Remove unreacted alcohols for the first time, and then put it into a 70°C oven to dry to obtain zinc glycerate;

[0053] 3) Zinc glycerate was calcined to prepare zinc oxide microspheres: Zinc glycerate was put into a porcelain boat as a precursor and placed in a tube furnace, and heated at a rate of 2°C / min to 45...

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Abstract

The invention discloses a zinc oxide microsphere, an electrode and a preparation method thereof, and the preparation method of the zinc oxide microsphere comprises the following steps: 1) preparing a mixed solution; 2) reacting the mixed solution to prepare zinc-based glycerate; and 3) calcining the zinc-based glycerate to prepare zinc oxide microspheres. The zinc oxide microspheres which are controllable in size, controllable in internal structure and uniform in size are prepared through a simple solvothermal method by utilizing the reaction of the zinc salt, the glycerol and the isopropanol which are low in price. When the zinc oxide microsphere is used as a lithium ion battery negative electrode material, an electrochemical test result shows that the zinc oxide microsphere has high specific discharge capacity and excellent cycle performance. According to the method, expansion and shrinkage of zinc oxide in the charging and discharging process are effectively relieved, the problem of capacity fading caused by the volume effect can be effectively solved, and good cycle performance is achieved.

Description

Technical field: [0001] The invention relates to the field of lithium ion batteries, in particular to zinc oxide microspheres, electrodes and a preparation method thereof. Background technique: [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, and no memory effect, and have been used in various electronic devices such as mobile phones, notebook computers, and cameras. The negative electrode material is the key to determine the future development of lithium-ion batteries, and the traditional graphite negative electrode material has a low capacity (372mAh g -1 ) has been unable to meet the growing needs of the people. In recent years, such as NiO, Co 3 o 4 , ZnO and Fe 2 o 3 Metal oxides such as metal oxides have been used as anode materials to further increase the capacity of lithium-ion batteries. Among them, zinc oxide, as a typical transition metal oxide, has a high theoretical specific capacity (978mAh g -1 ) is a potential li...

Claims

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Application Information

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IPC IPC(8): C01G9/02H01M4/131H01M4/48H01M10/0525
CPCC01G9/02H01M4/483H01M4/131H01M10/0525C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2004/52C01P2006/40Y02E60/10
Inventor 郭艳谷晓俊左佳露
Owner INNER MONGOLIA UNIVERSITY
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