A carbon-wrapped titanium dioxide airgel lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery, titanium dioxide technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of inability to achieve precise control of structure and composition, complex synthesis methods, etc., to achieve improved battery life The effect of chemical activity, simple preparation process and process, and low cost

Inactive Publication Date: 2020-06-09
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to propose a carbon-wrapped titanium dioxide airgel lithium-ion battery negative electrode material and its preparation method, the method is complex for the synthesis of carbon-wrapped titanium dioxide material, and the structure and composition cannot be achieved In order to further improve the battery performance of carbon-wrapped titanium dioxide materials, realize the application in lithium-ion batteries, and simplify the materials and preparation process, this method is to further improve the electrode performance of carbon-wrapped nano-titanium dioxide materials, while simplifying the material The preparation process reduces the cost of raw materials. The present invention proposes a preparation method for the negative electrode material of carbon-wrapped titanium dioxide airgel lithium-ion batteries. Through the sol-gel method and the method of self-assembly of organic carbon precursors, mesoporous carbon-wrapped Nano-titanium dioxide material, the material has good electrochemical properties and charge-discharge rate performance, and can be used as an electrode material for high-performance lithium-ion batteries

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  • A carbon-wrapped titanium dioxide airgel lithium-ion battery negative electrode material and preparation method thereof
  • A carbon-wrapped titanium dioxide airgel lithium-ion battery negative electrode material and preparation method thereof
  • A carbon-wrapped titanium dioxide airgel lithium-ion battery negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0039] 4.4 g of tetrabutyl titanate and 0.2 ml of hydrochloric acid were added to 20 ml of ethanol, and the first reaction solution was obtained after uniform stirring. 1.5 ml of deionized water was added to 20 ml of ethanol, and after stirring, an aqueous ethanol solution was obtained. The upper aqueous ethanol solution is slowly added to the first reaction solution, stirred at room temperature, then the sol is poured into a petri dish, and aged at 30° C. for 24 hours to obtain a colorless transparent titanium dioxide gel. 1 g of bisphenol A diglycidyl ether was added to 10 ml of tetrahydrofuran, and the second reaction solution was obtained after uniform stirring. The upper titanium dioxide gel and the second reaction solution are mixed and put into a reaction tank, and are allowed to stand under heating at 70° C. for 24 hours to obtain a light yellow transparent dry gel. The dry gel is cooled and supercritically dried with carbon dioxide to obtain a light yellow transparent...

Embodiment 2

[0046] 4.0 g of tetrabutyl titanate and 0.1 ml of hydrochloric acid were added to 20 ml of ethanol, and the first reaction solution was obtained after uniform stirring. Add 2 ml of deionized water to 20 ml of ethanol and stir well to obtain an aqueous ethanol solution. The upper aqueous ethanol solution is slowly added to the first reaction solution, stirred at room temperature, then the sol is poured into a petri dish, and aged at 25° C. for 24 hours to obtain a colorless transparent titanium dioxide gel. 1 g of bisphenol A diglycidyl ether was added to 15 ml of tetrahydrofuran, and the second reaction solution was obtained after uniform stirring. The upper titanium dioxide gel and the second reaction solution are mixed and put into a reaction tank, and are allowed to stand under heating at 80° C. for 12 hours to obtain a light yellow transparent dry gel. The dry gel is cooled and supercritically dried with carbon dioxide to obtain a light yellow transparent aerogel. Finally...

Embodiment 3

[0048] 5.5 g of tetrabutyl titanate and 0.2 ml of hydrochloric acid are added to 20 ml of ethanol, and the first reaction solution is obtained after uniform stirring. Add 3.8 ml of deionized water to 30 ml of ethanol, and stir well to obtain an aqueous ethanol solution. The upper aqueous ethanol solution is slowly added to the first reaction solution, stirred at room temperature, then the sol is poured into a petri dish, and aged at 25° C. for 20 hours to obtain a colorless transparent titanium dioxide gel. Add 2 g of bisphenol A diglycidyl ether to 15 ml of tetrahydrofuran, and stir uniformly to obtain a second reaction solution. The upper titanium dioxide gel and the second reaction solution are mixed and put into a reaction tank, and are allowed to stand under heating at 70° C. for 20 hours to obtain a light yellow transparent dry gel. The dry gel is cooled and supercritically dried with carbon dioxide to obtain a light yellow transparent aerogel. Finally, the aerogel was ...

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Abstract

The invention relates to a preparation method of a carbon-coated titanium dioxide aerogel lithium ion battery anode material and belongs to the fields of nano material preparation and electrochemicalmaterials. The preparation method comprises the following steps: mixing a titanium source, a hydrochloric acid water solution and absolute ethanol according to a certain mol ratio to obtain a first reaction solution; mixing the first reaction solution with a certain amount of a hydrous ethanol solution, and allowing the mixed solution to stand and age to obtain xerogel; mixing an organic carbon precursor and an organic solvent according to a certain mol ratio to obtain a second reaction solution; mixing and heating the obtained xerogel and the second reaction solution, and after reaction ends,performing supercritical drying with carbon dioxide to obtain organic compound titanium dioxide aerogel; and performing high-temperature heat treatment on the aerogel under an inert gas condition toobtain the carbon-coated titanium dioxide aerogel. The carbon-coated titanium dioxide aerogel prepared by the preparation method still maintains high specific capacity of 133mAh / g after 3000 times ofcirculation under 10C high current density, and the carbon-coated titanium dioxide aerogel can serve as a high-performance lithium ion battery anode material.

Description

Technical field [0001] The invention relates to a carbon-coated titanium dioxide aerogel lithium ion battery negative electrode material and a preparation method thereof, in particular to nano material preparation and electrochemical materials, and belongs to the technical field of lithium ion battery preparation. Background technique [0002] Lithium-ion battery is a major electrochemical energy storage device in modern society, and it has a wide range of applications in portable communications, wearable devices, electric vehicles, etc.; in addition, it also has huge applications in aerospace technology, robots and various smart devices. prospect. Lithium-ion batteries have the advantages of high energy density, no memory effect, low pollution, energy saving and environmental protection. However, the current lithium-ion battery technology has shortcomings such as narrow operating temperature range and poor thermal stability, and there are certain safety risks. At the same time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 张策刘盛堂崔方明
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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