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SnS2-CNTs composite material and preparation method thereof, as well as preparation method of composite anode material

A composite material and dispersion technology, applied in the field of materials, can solve problems such as poor conductivity of elemental sulfur

Inactive Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of lithium-sulfur batteries is hindered by the following two main problems: the poor conductivity of elemental sulfur; the severe "shuttle effect" caused by the easy dissolution of lithium polysulfide, an intermediate product of discharge, in the electrolyte.

Method used

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  • SnS2-CNTs composite material and preparation method thereof, as well as preparation method of composite anode material
  • SnS2-CNTs composite material and preparation method thereof, as well as preparation method of composite anode material
  • SnS2-CNTs composite material and preparation method thereof, as well as preparation method of composite anode material

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preparation example Construction

[0023] A kind of SnS provided by the embodiment of the present invention 2 -The preparation method of CNTs composite material, comprises the following steps:

[0024] S1. Add tin tetrachloride pentahydrate into the uniformly dispersed CNTs dispersion, and stir evenly to obtain the first solution.

[0025] Further, the homogeneous dispersion of the CNTs dispersion is carried out by ultrasonic dispersion for 3.5-4.5 hours.

[0026] In other optional embodiments of the present invention, to uniformly disperse the above-mentioned CNTs dispersion liquid may also choose to adopt other applicable dispersion methods in the art.

[0027] Further, in this embodiment, the above-mentioned CNTs dispersion liquid can be selected to be self-made or obtained through commercial purchase.

[0028] Optionally, CNTs are prepared by CVD.

[0029] Concretely, the quartz boat that will fill appropriate amount of catalyst is put into tube furnace, under 50sccmAr atmosphere, temperature is increase...

Embodiment 1

[0056] A preparation method for preparing a composite positive electrode material provided in this embodiment comprises the following steps:

[0057] CNTs were prepared by CVD method. The specific process is as follows: put a quartz boat filled with an appropriate amount of self-made catalyst into a tube furnace, and set the temperature at 10°C. min -1 The heating rate was raised to 800°C, and then 40sccmH 2 , reduce the catalyst at constant temperature for 60min; then lower the temperature to 700°C under 30sccmAr atmosphere, and pass a mixed gas (25sccm C 2 h 2 and 225sccmAr), 60min to grow CNTs. Finally, under the 50sccmAr atmosphere, it is naturally lowered to room temperature, taken out and put into a round bottom flask, and an appropriate amount of concentrated HNO is added. 3 , after ultrasonic dispersion, it was condensed and refluxed at 80°C for 5 hours, filtered and washed until neutral, and dried overnight at 60°C to obtain CNTs.

[0058] Disperse CNTs in 50ml ...

Embodiment 2

[0061] A preparation method for preparing a composite positive electrode material provided in this embodiment comprises the following steps:

[0062] CNTs were prepared by CVD method. The specific process is as follows: put a quartz boat filled with an appropriate amount of self-made catalyst into a tube furnace, and set the temperature at 10°C. min -1 The heating rate was raised to 800°C, and then 40sccmH 2 , reduce the catalyst at constant temperature for 60min; then lower the temperature to 700°C under 30sccmAr atmosphere, and pass a mixed gas (25sccm C 2 h 2 and 225sccmAr), 60min to grow CNTs. Finally, under the 50sccmAr atmosphere, it is naturally lowered to room temperature, taken out and put into a round bottom flask, and an appropriate amount of concentrated HNO is added. 3 , after ultrasonic dispersion, it was condensed and refluxed at 80°C for 5 hours, filtered and washed until neutral, and dried overnight at 60°C to obtain CNTs.

[0063] Disperse CNTs in 50ml ...

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Abstract

The invention relates to the field of materials, in particular to a SnS2-CNTs composite material and a preparation method thereof, as well as a preparation method of a composite anode material. preparation method of the SnS2-CNTs composite material comprises the steps that tin chloride pentahydrate is added to a uniformly dispersed CNTs dispersion solution, and after uniform stirring is completed,a first solution is obtained; a sulfur source solution is added to the first solution, after uniform stirring is completed, reaction is carried out for 20-25 hours at 175-185 DEG C, and after coolingis carried out until the room temperature is reached, the SnS2-CNTs composite material is obtained. The preparation method of the composite anode material comprises the step that the SnS2-CNTs composite material and sulfur are subjected to thermal melting treatment, and a SnS2-CNTs composite anode material is obtained. Tin disulfide has high chemical adsorption performance, carbon nano tubes havegood electrical conductivity, SnS2 and CNTs have a synergistic effect, and the electrochemical properties of sulfur anodes are improved effectively.

Description

technical field [0001] The invention relates to the field of materials, in particular to a SnS 2 -CNTs composite material and its preparation method and preparation method of composite cathode material. Background technique [0002] With the rapid development of human society and the continuous progress of science and technology, lithium-ion batteries with low energy density can no longer meet people's current needs. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh.g -1 ) and theoretical specific energy (2600Wh.kg -1 ) has become a candidate for a new generation of lithium-ion batteries. However, the application of lithium-sulfur batteries is hindered by the following two main problems: the poor conductivity of elemental sulfur; and the severe "shuttle effect" caused by the easy dissolution of lithium polysulfides, an intermediate product of discharge, in the electrolyte. Contents of the invention [0003] The first object of the present inve...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/36H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 江奇刘青青卢晓英
Owner SOUTHWEST JIAOTONG UNIV
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