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Preparation method of titanium dioxide negative electrode material coated with surfactant serving as carbon source

A surfactant and titanium dioxide technology, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of insufficient contact, uneven carbon layer, etc., and achieve improved electronic conductivity, wide application value, and excellent electrochemical performance. performance effect

Inactive Publication Date: 2017-04-26
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the carbon sources of carbon coating are mainly concentrated in electrically neutral molecules such as glucose (sucrose) and polymers. These carbon source molecules are discretely dispersed around the titanium dioxide precursor, resulting in insufficient contact between titanium dioxide and the carbon coating layer. The carbon layer is not uniform enough, and its electrochemical performance needs to be further improved

Method used

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  • Preparation method of titanium dioxide negative electrode material coated with surfactant serving as carbon source
  • Preparation method of titanium dioxide negative electrode material coated with surfactant serving as carbon source
  • Preparation method of titanium dioxide negative electrode material coated with surfactant serving as carbon source

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Embodiment 1

[0019] A method for preparing a titanium dioxide negative electrode material coated with a surfactant as a carbon source, using the electrostatic attraction between the cationic surfactant and the negatively charged titanium dioxide precursor titanate, and preparing it by hydrothermal method and subsequent high-temperature calcination carbon-coated titanium dioxide, the steps are as follows:

[0020] 1) Add 0.5g of cetyltrimethylammonium bromide (CTAB) into 15mL of deionized water and stir until completely dissolved; take 1.0g of tetrabutyl titanate and dissolve it in a stainless steel autoclave containing 20mL of absolute ethanol, Stir until dissolved;

[0021] 2) Slowly drop the above-prepared solution containing CTAB into the reaction kettle, mix evenly, put it in a constant temperature oven for hydrothermal reaction for 12 hours, wash the product with deionized water and absolute ethanol, centrifuge, and dry to obtain titanium dioxide powder ;

[0022] 3) Put the above t...

Embodiment 2

[0026] A method for preparing a titanium dioxide negative electrode material coated with a surfactant as a carbon source, using the electrostatic attraction between the cationic surfactant and the negatively charged titanium dioxide precursor titanate, and preparing it by hydrothermal method and subsequent high-temperature calcination carbon-coated titanium dioxide, the steps are as follows:

[0027] 1) Add 0.5g of cetyltrimethylammonium bromide (CTAB) into 15mL of deionized water and stir until completely dissolved; take 1.0g of tetrabutyl titanate and dissolve it in a stainless steel autoclave containing 20mL of absolute ethanol, Stir until dissolved;

[0028] 2) Slowly drop the above-prepared solution containing CTAB into the reaction kettle, mix evenly, put it in a constant temperature oven for hydrothermal reaction for 12 hours, wash the product with deionized water and absolute ethanol, centrifuge, and dry to obtain titanium dioxide powder ;

[0029] 3) Put the above-m...

Embodiment 3

[0034] A method for preparing a titanium dioxide negative electrode material coated with a surfactant as a carbon source, using the electrostatic attraction between the cationic surfactant and the negatively charged titanium dioxide precursor titanate, and preparing it by hydrothermal method and subsequent high-temperature calcination carbon-coated titanium dioxide, the steps are as follows:

[0035] 1) Add 0.5g of cetyltrimethylammonium chloride (CTAC) into 15mL of deionized water and stir until completely dissolved; take 1.0g of tetrabutyl titanate and dissolve it in a stainless steel autoclave containing 20mL of absolute ethanol, Stir until dissolved;

[0036] 2) Slowly drop the above-prepared solution containing CTAB into the reaction kettle, mix evenly, put it in a constant temperature oven for hydrothermal reaction for 12 hours, wash the product with deionized water and absolute ethanol, centrifuge, and dry to obtain titanium dioxide powder ;

[0037] 3) Put the above-...

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Abstract

The invention discloses a preparation method of a titanium dioxide negative electrode material coated with a surfactant serving as a carbon source. According to the preparation method, the surfactant is taken as the carbon source, and carbon-coated titanium dioxide is prepared by a hydrothermal method and subsequent high-temperature calcination; and modulation and control of a carbon coating layer of the titanium dioxide are realized under the action of electrostatic force between the surfactant and a titanium dioxide precursor titanic acid radical carrying negative charges. The preparation method has the advantages that the problems of non-uniform carbon layer covering and loose contact in a conventional carbon-coated titanium dioxide negative electrode material are solved, and the electronic conductivity of the titanium dioxide is enhanced, thereby enhancing the important electrochemical performance such as the specific capacity, rate capability and cycling stability of the material. The preparation method has a very high practical value and a good application prospect.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide negative electrode material coated with a surfactant as a carbon source, and belongs to the technical field of electrochemical energy materials. Background technique [0002] Energy is an important material basis for human survival and development. As an efficient energy storage system, lithium-ion batteries have become a research hotspot and are widely used in electronic devices and electric vehicles, but they are always constrained by the scarcity of lithium resources and rising prices. Sodium, by contrast, is abundant in the ocean and is cheap and readily available. In addition, sodium element and lithium element belong to the same main group, have similar properties, and the charging and discharging mechanism is basically the same. Therefore, the research and development of sodium-ion batteries brings unlimited potential to the future of secondary batteries, and brings new opportu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054
CPCH01M4/366H01M4/48H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 王一菁袁华堂李云蔚陈程成
Owner NANKAI UNIV
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