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Preparation method of ZnCo2O4 nano-plate serving as lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of negative electrode material capacity decay, short cycle life, poor rate performance, etc. The effect of mild conditions, low cost and simple preparation process

Inactive Publication Date: 2014-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems such as serious capacity attenuation, poor rate performance and short cycle life of existing transition metal oxide-based lithium ion battery negative electrode materials, and to provide a two-dimensional supercharged lithium ion battery negative electrode material based on microwave-assisted synthesis. Preparation method and application of thin zinc cobaltate nanosheets

Method used

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  • Preparation method of ZnCo2O4 nano-plate serving as lithium ion battery negative electrode material
  • Preparation method of ZnCo2O4 nano-plate serving as lithium ion battery negative electrode material
  • Preparation method of ZnCo2O4 nano-plate serving as lithium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Dissolve zinc nitrate and cobalt nitrate with a molar ratio of 1:2 in a high-purity water solvent, stir magnetically for 30 minutes, and after filling and dissolving, add a certain amount of Sodium hydroxide reagent, after mixing, continue to stir for 10 to 30 minutes.

[0024] (2) Transfer the above mixed solution to a microwave reaction vessel, set the power to 500W, and condense and reflux for 30 minutes under microwave irradiation. After the reaction is completed, naturally cool to room temperature, centrifuge, wash, separate and dry to obtain the zinc cobaltate precursor bulk nanomaterials.

[0025] (3) Put the zinc cobaltate precursor nanomaterial obtained in the previous step into a high-temperature furnace for 3 hours at 350°C for heat treatment, and then naturally cool to room temperature to obtain a two-dimensional ultra-thin ZnCo 2 o 4 Nanosheets.

[0026] (4) Use the material prepared in the previous step as the negative electrode of lithium ion batte...

Embodiment example 2

[0029] (1) Dissolve zinc sulfate and cobalt acetate with a molar ratio of 1:2 in a mixed solvent of high-purity water and ethylene glycol, wherein the volume ratio of water and ethylene glycol is 1:7, stir magnetically for 30 minutes, and wait for the solution to dissolve. , and then add a certain amount of potassium hydroxide reagent according to the molar ratio of metal ion to alkaline reagent is 1:8, mix and continue to stir for 10 to 30 minutes.

[0030] (2) Transfer the above mixed solution to a microwave reaction vessel, set the power to 500W, and condense and reflux for 15 minutes under microwave irradiation. After the reaction is completed, naturally cool to room temperature, centrifuge, wash, separate and dry to obtain the zinc cobaltate precursor bulk nanomaterials.

[0031] (3) Put the zinc cobaltate precursor nanomaterial obtained in the previous step into a high-temperature furnace at 350 °C for 2 hours, and then naturally cool to room temperature to obtain a two-...

Embodiment example 3

[0034] (1) Dissolve zinc nitrate and cobalt chloride with a molar ratio of 1:2 in ethylene glycol solvent, and stir magnetically for 30 minutes. After filling and dissolving, then add it according to the molar ratio of metal ion and alkaline reagent as 1:4 A certain amount of urea reagent, after mixing, continue to stir for 10 to 30 minutes.

[0035] (2) Transfer the above mixed solution to a microwave reaction vessel, set the power to 700W, and condense and reflux for 10 minutes under microwave irradiation. After the reaction is completed, naturally cool to room temperature, centrifuge, wash, separate and dry to obtain the zinc cobaltate precursor bulk nanomaterials.

[0036] (3) Put the zinc cobaltate precursor nanomaterial obtained in the previous step into a high-temperature furnace at 400 °C for 2 hours, and then naturally cool to room temperature to obtain a two-dimensional ultra-thin ZnCo 2 o 4 Nanosheets.

[0037] (4) After the battery is assembled according to the ...

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Abstract

The invention discloses a preparation method of a ZnCo2O4 nano-plate serving as a lithium ion battery negative electrode material. The preparation method comprises the steps of carrying out basic hydrolysis on zinc salt and cobalt salt according to the molar ratio of 1 to 2 in a hydrophilic solvent by virtue of an alkaline reagent under the microwave irradiation induction to generate a metal hydroxide or hydrocarbon precursor, and then carrying out low-temperature heat treatment to obtain a two-dimensional ultrathin ZnCo2O4 nano-plate to be used as the lithium ion battery negative electrode material finally. With the adoption of the preparation method, as the ZnCo2O4 nano-plate serving as the lithium ion battery negative electrode material is synthesized with the assistance of microwaves, the preparation process is simple, the cost is low, the reaction condition is mild, special equipment is not needed in the whole reaction process, the quality of the product which is finally obtained is high, and the morphology and the size of the product are uniform; when being used as the lithium ion battery negative electrode material, the ZnCo2O4 nano-plate shows good electrochemical performance, can be used for well solving the problems of serious capacity fading, stable long-term circulation and low rate performance of the transition metal oxides and is an ideal lithium ion battery negative electrode material which has wide commercial application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a negative electrode material of a lithium ion battery, in particular to a preparation method of a two-dimensional ultrathin zinc cobaltate nanosheet, which belongs to the field of preparation technology and application of new energy materials. Background technique [0002] At present, lithium-ion secondary batteries are widely used in various mobile electronic products, but with the emergence of a series of new electronic devices and electric vehicles, they are required to have higher energy density and power density. And its performance mainly depends on the positive and negative electrode materials, so the development of new electrode materials has become the key to the development of lithium-ion battery technology. Due to the advantages of high theoretical capacity and no safety hazard, transition metal oxides have become a hot research topic in negative electrode materials. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/04B82Y30/00B82Y40/00
CPCY02E60/122B82Y30/00B82Y40/00C01G51/40H01M4/525H01M10/0525Y02E60/10
Inventor 曹传宝朱有启张君婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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