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Dried-persimmon-type core-shell-structured C/ZnO lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., to achieve high reversible performance, improve rate performance, and easy operation

Inactive Publication Date: 2018-05-18
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is still a great challenge to obtain and maintain high reversible capacity, good cycle performance and excellent rate capability of ZnO electrode materials.

Method used

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  • Dried-persimmon-type core-shell-structured C/ZnO lithium ion battery negative electrode material and preparation method thereof
  • Dried-persimmon-type core-shell-structured C/ZnO lithium ion battery negative electrode material and preparation method thereof
  • Dried-persimmon-type core-shell-structured C/ZnO lithium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0032] This embodiment provides a method for preparing a persimmon-shaped core-shell structure C / ZnO lithium-ion battery negative electrode material, including the following steps:

[0033] S1. preparing solid carbon spheres;

[0034] S2. Use a graduated cylinder to measure 50ml of ethanol in a 100ml beaker, weigh 3g of zinc acetate dihydrate and place it in a beaker filled with ethanol, ultrasonically dissolve the zinc acetate dihydrate, use a burette to measure 4ml of ethanolamine and add zinc acetate dihydrate , ethanol solution, weighed 0.9g of solid carbon spheres in the above mixed solution, stirred for 6h, transferred the solution to a reaction kettle, and carried out hydrothermal reaction at 180°C for a reaction time of 6h, centrifuged to obtain a black product , dried in an oven;

[0035] S3. calcining the dried product in a tube furnace at 800°C for 6 hours to obtain a black product, and calcining the obtained black product in a muffle furnace at 600°C for 6 hours t...

Embodiment 2

[0041] This embodiment provides a method for preparing a persimmon-shaped core-shell structure C / ZnO lithium-ion battery negative electrode material, including the following steps:

[0042] S1. preparing solid carbon spheres;

[0043] S2. Use a graduated cylinder to measure 30ml of ethanol in a 100ml beaker, weigh 3g of zinc acetate dihydrate and place it in a beaker filled with ethanol, ultrasonically dissolve the zinc acetate dihydrate, use a burette to measure 2ml of ethanolamine and add zinc acetate dihydrate , ethanol solution, weighed 0.6g of solid carbon spheres in the above mixed solution, stirred for 6h, transferred the solution to a reaction kettle, and carried out hydrothermal reaction at 150°C for a reaction time of 2h, centrifuged to obtain a black product , dried in an oven;

[0044] S3. calcining the dried product in a tube furnace at 600°C for 2 hours to obtain a black product, and calcining the obtained black product in a muffle furnace at 400°C for 2 hours t...

Embodiment 3

[0048] This embodiment provides a method for preparing a persimmon-shaped core-shell structure C / ZnO lithium-ion battery negative electrode material, including the following steps:

[0049] S1. preparing solid carbon spheres;

[0050] S2. Use a graduated cylinder to measure 40ml of ethanol in a 100ml beaker, weigh 2g of zinc acetate dihydrate and place it in a beaker filled with ethanol, ultrasonically dissolve the zinc acetate dihydrate, and use a burette to measure 3ml of ethanolamine and add zinc acetate dihydrate , ethanol solution, weighed 0.7g of solid carbon spheres in the above mixed solution, stirred for 6h, transferred the solution to the reaction kettle, and carried out hydrothermal reaction at 160°C, the reaction time was 3h, and the black product was obtained after centrifugation , dried in an oven;

[0051] S3. calcining the dried product in a tube furnace at 650°C for 3 hours to obtain a black product, and calcining the obtained black product in a muffle furnac...

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Abstract

The invention relates to the technical field of a lithium ion negative electrode material, and discloses a dried-persimmon-type core-shell-structured C / ZnO lithium ion battery negative electrode material and a preparation method thereof. Absolute ethanol, zinc acetate dehydrate, ethanolamine and glucose are taken as raw materials, and the time and temperature of a hydrothermal reaction is strictlycontrolled to prepare a dried-persimmon-type core-shell-structured C / ZnO material. Compared with a ZnO negative electrode material in the prior art, the dried-persimmon-type core-shell-structured C / ZnO with a special shape is greatly improved in conductivity and stability and obviously improved in electrochemical performance. According to the lithium ion battery negative electrode material, stress variation due to size variation in a charge-discharge process is reduced, and the dried-persimmon-type shape increases the specific surface area, so that the cycle performance of a lithium ion battery is efficiently improved. Furthermore, existence of carbon allows the conductivity of a ZnO negative electrode material to be improved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion negative electrode materials, and more specifically relates to a persimmon-shaped core-shell structure C / ZnO lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Energy and materials are the most important material basis for supporting today's human civilization and ensuring social development. Lithium-ion batteries are widely used due to their high operating voltage, high specific energy, no memory effect, and no pollution to the environment. They are ideal power sources for small and lightweight electronic devices such as portable instruments, electric vehicles, and mobile phones. It has inspired a large number of researchers to research and explore lithium-ion anode materials. At present, the theoretical specific capacity of graphite materials is only 375mAh / g, which gradually cannot meet the application requirements of huma...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 周伟谢德梅郑佳玲
Owner HUNAN UNIV OF TECH
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