Preparation method of SnSe/Graphene composite electrode material for negative electrode of sodium-ion battery

A sodium-ion battery and composite electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of carbon composites without an effective control structure and a single synthesis method, and achieve a simple and novel preparation method with significant scientific significance. The effect of high repetition rate

Active Publication Date: 2016-06-01
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] It can be seen that there are few reports on the synthesis of SnSe at present, and the synthesis method is relatively simple.
Since SnSe also has the problem of large volume expansion, but the carbon composite used in the current reported method does not effectively control the structure. Therefore, it is of great significance to develop a method that is simple in the preparation process and can effectively control the structure of the SnSe / C composite.

Method used

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  • Preparation method of SnSe/Graphene composite electrode material for negative electrode of sodium-ion battery
  • Preparation method of SnSe/Graphene composite electrode material for negative electrode of sodium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Add 30 mg of graphene oxide (0.3-5 μm in size and 0.55-1.2 nm in thickness) into 50 mL of deionized water, stir evenly, and then perform ultrasonic treatment (ultrasonic power 40W) for 30 minutes to obtain a uniform mixed solution A, and then add the mixed solution to Add 0.3382g SnCl to A 2 2H 2 O, after stirring evenly, ultrasonic treatment for 30min (ultrasonic power 40W) to obtain a uniform mixed solution B.

[0024] 2) The mixed solution B obtained above is transferred to a polytetrafluoroethylene hydrothermal kettle (the filling degree of the hydrothermal kettle is controlled at 50%), and then placed in a homogeneous reactor (Yantai Keli Chemical Equipment Co., Ltd., KLJX- 8A), reacted at 120°C for 12h, and naturally cooled to room temperature after the reaction. Then the powder obtained by the reaction is separated by centrifugation, and the powder obtained by the separation is freeze-dried to obtain SnO 2 / Graphene composites.

[0025] 3) The above obtain...

Embodiment 2

[0028] 1) Add 50mg of graphene oxide (0.3-5μm in size and 0.55-1.2nm in thickness) into 50mL of deionized water, stir evenly, and then perform ultrasonic treatment (ultrasonic power 50W) for 60min to obtain a uniform mixed solution A, and then add the mixed solution to Add 0.6765g SnCl to A 2 2H 2 O, after stirring evenly, sonicate (ultrasonic power 50W) for 60 minutes to obtain a uniform mixed solution B.

[0029] 2) Transfer the mixed solution B obtained above to a polytetrafluoroethylene hydrothermal kettle (the filling degree of the hydrothermal kettle is controlled at 50%), and then place it in a homogeneous reactor (Yantai Keli Chemical Equipment Co., Ltd., KLJX- 8A), reacted at 150°C for 8h, and naturally cooled to room temperature after the reaction. Then the powder obtained by the reaction is separated by centrifugation, and the powder obtained by the separation is freeze-dried to obtain SnO 2 / Graphene composites.

[0030] 3) The above obtained SnO 2 / Graphene co...

Embodiment 3

[0033] 1) Add 80 mg of graphene oxide (0.3-5 μm in size and 0.55-1.2 nm in thickness) into 80 mL of deionized water, stir evenly, and then perform ultrasonic treatment (ultrasonic power 60 W) for 90 minutes to obtain a uniform mixed solution A, and then add the mixed solution to Add 0.6765g SnCl to A 2 2H 2 O, after stirring evenly, ultrasonic treatment (ultrasonic power 60W) for 90min to obtain a uniform mixed solution B.

[0034] 2) Transfer the mixed solution B obtained above to a polytetrafluoroethylene hydrothermal kettle (the filling degree of the hydrothermal kettle is controlled at 80%), and then place it in a homogeneous reactor (Yantai Keli Chemical Equipment Co., Ltd., KLJX- 8A), reacted at 180°C for 3h, and naturally cooled to room temperature after the reaction. Then the powder obtained by the reaction is separated by centrifugation, and the powder obtained by the separation is freeze-dried to obtain SnO 2 / Graphene composites.

[0035] 3) The above obtained S...

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Abstract

The invention provides a preparation method of an SnSe/Graphene composite electrode material for a negative electrode of a sodium-ion battery. The method comprises the following steps: with water as a solvent, SnCl<2>.2H<2>O as a raw material and graphene oxide as carbon matrix, preparing an SnO<2>/Graphene composite material by a hydrothermal method in advance; grinding and mixing the SnO<2>/Graphene composite material and selenium powder evenly, putting the mixture into a vacuum tube furnace and carrying out heat preservation at 500-900 DEG C for 0.5-5 hours; and finally obtaining a pure-phase SnSe/Graphene composite material. The particle sizes of SnSe are 5-10nm; and the SnSe grows on the surface of Graphene. The used preparation method is simple, novel and high in repetitive rate; and the adopted vacuum calcination method is clean and free of pollution, and is suitable for the requirements of large-scale production and preparation.

Description

technical field [0001] The invention relates to the preparation of a SnSe / Graphene composite electrode material for a negative electrode of a sodium ion battery. Background technique [0002] In recent years, with the development of electric vehicles and smart grids, the demand for large-scale energy storage equipment is also increasing. Lithium-ion batteries have become a research hotspot due to their high energy density, but the reserves of lithium resources on the earth are limited, and it is difficult to meet the needs of large-scale applications. Na-ion batteries are the most likely secondary batteries to replace lithium-ion batteries due to their low cost of sodium source, environmental friendliness, and safety. However, since the reversible capacity and voltage platform of electrode materials reported so far are lower than those of lithium-ion batteries, the energy density of sodium-ion batteries is lower than that of lithium-ion batteries. Therefore, it is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/583H01M4/38H01M4/139
CPCH01M4/139H01M4/362H01M4/387H01M4/583H01M10/36Y02E60/10
Inventor 黄剑锋程娅伊李嘉胤许占位曹丽云欧阳海波齐慧柴思敏
Owner SHAANXI UNIV OF SCI & TECH
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