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Sulfur/dual layer titanium dioxide composite material and preparation method and applications thereof

A titanium dioxide and composite material technology, which is applied in the field of sulfur/double-layer titanium dioxide composite material and its preparation, can solve the problems of large difference in density of lithium sulfide, unstable electrochemical performance, volume expansion of positive electrode material, etc., so as to improve the electrochemical performance , Suppress the volume expansion effect and slow down the effect of reducing the specific capacity

Inactive Publication Date: 2018-07-20
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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AI Technical Summary

Problems solved by technology

Second, the intermediate products in the process of charging and discharging will dissolve in the electrolyte, which will cause the loss of the active material of the positive electrode material and cause a large decrease in the specific capacity of the battery.
Third, the density difference between the positive electrode material sulfur and the discharge product lithium sulfide is large, which will cause the volume expansion of the positive electrode material during the discharge process.
[0005] Although the above-mentioned technologies have improved the performance of lithium-sulfur battery cathode materials, they all have some common shortcomings: the volume capacity of the material is small, the sulfur loading capacity is not high, the volume expansion effect is obvious, resulting in poor cycle performance, and the overall electrochemical performance unstable

Method used

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  • Sulfur/dual layer titanium dioxide composite material and preparation method and applications thereof
  • Sulfur/dual layer titanium dioxide composite material and preparation method and applications thereof
  • Sulfur/dual layer titanium dioxide composite material and preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0039] Step 1: Synthesis of Polystyrene Microspheres

[0040] First, slowly add 50ml of styrene monomer and 6ml of acrylic acid into 500ml of distilled water. After stirring and dispersing, use a water bath to heat the temperature of the reaction system to 60°C, and then pass nitrogen gas for 30 minutes to remove oxygen in the solution. 10ml of 50mmol / L potassium persulfate Aqueous solution, under the stirring condition of 300r / min, continued to react for 12h. The resulting emulsion was separated in a centrifuge, washed with ethanol, vacuum freeze-dried, and dried for later use.

[0041] The second step: preparation of hollow silica microspheres

[0042] 3g of polystyrene microspheres prepared in the previous step and 3g of cetyltrimethylammonium bromide were added to 50ml of NaHCO 3 ethanol / water solution (1:1 ratio of ethanol and distilled water, NaHCO 3 The mass fraction is 8%), ultrasonic dispersion 3h. Under the stirring condition of a magnetic stirrer, 5ml of tetraet...

Embodiment 2

[0048] The first step: Synthesis of polystyrene microspheres.

[0049] First, slowly add 60ml of styrene monomer and 6ml of acrylic acid into 500ml of distilled water. After stirring and dispersing, use a water bath to heat up the temperature of the reaction system to 70°C, and then pass nitrogen gas for 60 minutes to remove oxygen in the solution. 20ml of 50mmol / L potassium persulfate aqueous solution , The reaction was continued for 12h under the stirring condition of 300r / min. The resulting emulsion was separated in a centrifuge, washed with ethanol, vacuum freeze-dried, and dried for later use.

[0050] The second step: preparing hollow silica microspheres.

[0051] 5g of polystyrene microspheres prepared in the previous step and 5g of cetyltrimethylammonium bromide were added to 50mlNaHCO 3 ethanol / water solution (the ratio of ethanol and distilled water is 1:2, NaHCO 3 The mass fraction is 5%), ultrasonic dispersion 3h. Under the stirring condition of a magnetic stir...

Embodiment 3

[0057] The difference from Example 1 is that in the third step of synthesizing double-layered titanium dioxide nanospheres, 10 mg hollow silica microspheres, 30 ml acetic acid and 10 ml tetrabutyl titanate are used.

[0058] Other preparation methods and parameters are the same as in Example 1.

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Abstract

The invention provides a sulfur / dual layer titanium dioxide composite material and a preparation method and applications thereof. Dual layer titanium dioxide nano spheres are designed and then doped by sulfur to prepare the sulfur / dual layer titanium dioxide composite material. The obtained sulfur / dual layer titanium dioxide composite material can be used as a cathode material of a lithium-sulfurbattery; the amount of loaded sulfur of the cathode material is increased, the discharge-charge intermediate product can be adsorbed, thus the volume expansion and shuttling effect during the discharge-charge process can be reduced, and the electrochemical properties and circulation stability of the composite material are good.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium-sulfur batteries, and more specifically relates to a sulfur / double-layer titanium dioxide composite material and its preparation method and application. Background technique [0002] With the continuous development of science and technology and the continuous improvement of people's awareness, energy and the environment have become two major issues that people must not face up to. The development of environment-friendly and energy-saving industries has become the direction of continuous efforts of all scientific researchers. Optimizing the energy structure and vigorously developing new and renewable energies are challenges facing all energy workers. Especially with the rapid development of portable electronic products, smart grid, electric vehicles and energy storage, we have to improve the performance of batteries to match them. At present, the lithium-ion battery with tran...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M10/0525
CPCH01M4/36H01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 张永光
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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