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Caron-coated stannous oxide compound and preparation method and application thereof

A stannous oxide and carbon coating technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as large volume change and poor cycle performance

Inactive Publication Date: 2017-11-17
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of large volume change and poor cycle performance of alloy materials in sodium ion batteries, thereby providing a carbon-coated stannous oxide composite material with high cycle performance and small volume change

Method used

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  • Caron-coated stannous oxide compound and preparation method and application thereof
  • Caron-coated stannous oxide compound and preparation method and application thereof
  • Caron-coated stannous oxide compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Carbon-coated stannous oxide composite material

[0027] Dissolve 0.81g of Tris in 1L of water, stir, and prepare a buffer solution with pH=7.5; measure 20mL of the prepared buffer solution with a graduated cylinder, add 30mg of stannous oxide (SnO) into the buffer solution, Stir for 30 minutes to obtain a black turbid solution; add 10 mg of dopamine, and continue stirring for 47 hours; wash the obtained black liquid with distilled water and ethanol several times, centrifuge, and then put it in a vacuum oven at 60°C for drying; finally dry the black The material was calcined at 400°C for 2 hours under a nitrogen atmosphere, and the heating rate of the calcination was 4°C / min to obtain a carbon-coated stannous oxide (tin monoxide) composite material.

Embodiment 2

[0028] Example 2 Carbon-coated stannous oxide composite material

[0029] Dissolve 1.6g of Tris in 1L of water, stir, and prepare a buffer solution with pH=9.5; measure 80mL of the prepared buffer solution with a graduated cylinder, add 30mg of stannous oxide (SnO) into the buffer solution, Stir for 25 minutes to obtain a black turbid solution; add 20 mg of dopamine, and continue stirring for 47 hours; wash the obtained black liquid with distilled water and ethanol several times, centrifuge, and then put it in a vacuum oven at 60 ° C for drying; finally dry the black The material was calcined at 450°C for 2 hours under a nitrogen atmosphere, and the heating rate of the calcination was 4°C / min to obtain a carbon-coated stannous oxide (tin monoxide) composite material.

Embodiment 3

[0030] Example 3 Carbon-coated stannous oxide composite material

[0031] Dissolve 1.21g of Tris in 1L of water, stir, and prepare a buffer solution with pH=8.5; measure 50mL of the prepared buffer solution with a graduated cylinder, add 30mg of stannous oxide (SnO) to the buffer solution, Stir for 30 minutes to obtain a black turbid solution; add 30 mg of dopamine, and continue to stir for 48 hours; wash the obtained black liquid with distilled water and ethanol several times, centrifuge, and then put it in a vacuum oven at 60 ° C for drying; finally dry the black The material was calcined at 400°C for 2 hours under a nitrogen atmosphere, and the heating rate of the calcination was 4°C / min to obtain a carbon-coated stannous oxide (tin monoxide) composite material.

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Abstract

The invention discloses a carbon-coated stannous oxide compound. The carbon-coated stannous oxide compound is prepared by the steps of dissolving trihydroxymethyl aminomethane into water, stirring and preparing into a buffer solution; weighing the buffer solution, adding stannous oxide, stirring to form a black turbid solution; adding dopamine and continuously stirring; performing washing, centrifuging and drying; and performing calcining in nitrogen atmosphere to obtain the carbon-coated stannous oxide composite material. Dopamine is used as the carbon source for coating the surface of SnO, so that volume expansion of SnO in a circulation process is relieved, thereby improving the cycling performance in the application when SnO is used as a negative electrode material of a sodium ion battery; in the synthesis process, the solvent is non-toxic and harmless, the cost is relatively low and the operation is simple; the carbon-coated stannous oxide composite material has the most major advantage of excellent cycling performance; the initial-circle charging specific capacity can be close to 500mAh / g and the capacity is barely attenuated after 300 cycles, so that possibility is provided for the actual application of the composite material in the sodium ion battery material in the future.

Description

technical field [0001] The invention belongs to battery materials, in particular to a carbon-coated tin oxide compound and its application in sodium-ion batteries. Background technique [0002] In recent years, lithium-ion batteries have been widely used in energy storage devices, but at the same time, they have also caused a shortage of lithium resources. Therefore, now, the majority of researchers are looking for a new type of battery that can replace lithium-ion batteries. They found that the properties of metal sodium are very similar to metal lithium, and after experiments proved that sodium-ion batteries and lithium-ion batteries With the same sodium storage mechanism, it is a good way to replace lithium-ion batteries. At present, there are many materials that can be used as the negative electrode of sodium-ion batteries, and alloy materials have attracted widespread attention because of their high sodium storage capacity. [0003] For a long time, there has been a b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054
CPCH01M4/366H01M4/483H01M4/62H01M4/628H01M10/054Y02E60/10
Inventor 吴兴隆闫新吕红艳
Owner NORTHEAST NORMAL UNIVERSITY
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