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GeOx material, preparation method thereof and application of GeOx material in lithium ion battery

A technology of germanium oxide and hollow spheres, which is applied in the field of electrochemical materials, can solve problems such as capacity fading and material structure damage, and achieve the effects of increased storage performance, stable material structure, and good lithium intercalation and delithiation properties

Inactive Publication Date: 2014-08-06
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the charging and discharging process of lithium-ion batteries, the lithium-deintercalation reaction of germanium will be accompanied by a large volume change (~300%), resulting in the destruction of the material structure and the pulverization of the material, resulting in a rapid decline in capacity.

Method used

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  • GeOx material, preparation method thereof and application of GeOx material in lithium ion battery
  • GeOx material, preparation method thereof and application of GeOx material in lithium ion battery
  • GeOx material, preparation method thereof and application of GeOx material in lithium ion battery

Examples

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Effect test

Embodiment 1

[0035] (1), add 4mmoL germanium oxide and 15mmoL sodium hydroxide to 10mL deionized water, stir for 10 minutes to form a uniform colorless solution, germanium oxide is completely dissolved, and add 1mL12mol / L concentrated hydrochloric acid to the solution;

[0036] (2) Add 31mmol of sodium borohydride (dissolved in 10mL of water first), stir magnetically until completely mixed, and the color of the solution changes from white to brown after 1 hour. Then add 20 mL of 0.5 mol / L dilute hydrochloric acid dropwise to adjust the pH of the solution to 8. Bubbles are continuously generated during this process, and the brown product gathers on the surface of the solution;

[0037] (3), transfer the solution into a 60mL autoclave lined with polytetrafluoroethylene, tighten the lid and put it in an oven, react at 120°C for 6 hours, and naturally cool to room temperature to obtain a brown-black product.

[0038] Battery test results such as image 3 , 4 shown. The first discharge is 22...

Embodiment 2

[0042] (1), add 3mmoL germanium oxide and 14mmoL sodium hydroxide to 10mL deionized water, stir for 10 minutes to form a uniform colorless solution, germanium oxide is completely dissolved, and add 0.8mL12mol / L concentrated hydrochloric acid to the solution;

[0043] (2) Add 24mmol of sodium borohydride (dissolved in 10mL of water first), stir magnetically until completely mixed, and the color of the solution changes from white to brown after 1 hour. Then add 15mL of 0.3mol / L dilute hydrochloric acid dropwise to adjust the pH of the solution to 7. Bubbles are continuously generated during the process, and the brown product gathers on the surface of the solution;

[0044](3), transfer the solution into a 60mL autoclave lined with polytetrafluoroethylene, tighten the lid and place it in an oven, react at 120°C for 8 hours, and cool naturally to room temperature to obtain a brown-black product.

[0045] The battery test results show that the first discharge is 2200mAh / g, and the ...

Embodiment 3

[0047] (1), add 4mmoL germanium oxide and 15mmoL sodium hydroxide to 10mL deionized water, stir for 10 minutes to form a uniform colorless solution, germanium oxide is completely dissolved, and add 1mL12mol / L concentrated hydrochloric acid to the solution;

[0048] (2) Add 28mmol of sodium borohydride (dissolved in 10mL of water first), stir magnetically until completely mixed, and the color of the solution changes from white to brown after 3 hours. Add 15 mL of 0.5 mol / L dilute hydrochloric acid dropwise to adjust the pH of the solution to 7. Bubbles are continuously generated during the process, and the brown product gathers on the surface of the solution;

[0049] (3), transfer the solution into a 60 mL autoclave lined with polytetrafluoroethylene, tighten the lid and place it in an oven, react at 150° C. for 6 hours, and naturally cool to room temperature to obtain a brown-black product.

[0050] The battery test results show that the first discharge is 2360mAh / g, and the ...

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Abstract

The invention provides a GeOx material, a preparation method thereof and an application of the GeOx material in a lithium ion battery. The GeOx material prepared by the invention is in a three-dimensional hollow sphere structure, and the diameter is 200-300nm. According to the GeOx material provided by the invention, the shape and crystal structure of GeOx can be effectively controlled by adjusting the pH of the solution by a one-step hydrothermal synthesis method so as to improve the performance of the battery. The material obtained has the advantages of high capacity, good cyclicity and the like. The material can be widely applied to negative electrode materials of the lithium ion battery. The battery capacity after 50 times of circulation under the current density of 500mA / g is still 1000mAh / g which is greatly improved compared with the capacity of the negative electrode made of a carbon material.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, in particular to GeO with a three-dimensional hollow frame structure x The preparation method, and the application in the negative electrode material of lithium ion battery. Background technique [0002] In today's society, science and technology continue to develop. Energy and environmental issues have become the key to sustainable development. With the gradual reduction of non-renewable energy sources in the world and increasingly severe environmental problems, the development and application of new energy sources is urgent. Lithium-ion batteries will become the main development force of chemical energy due to their performance advantages. [0003] As we all know, the anode material of traditional lithium-ion batteries is carbon. Since the commercialization of lithium-ion batteries, the actual specific capacity has been close to the theoretical value of 372mAh / g, and it is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G17/00H01M4/48
CPCY02E60/10
Inventor 方臻强婷婷方佳新
Owner ANHUI NORMAL UNIV
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