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Porous cubic ZnSO3@graphene negative electrode material used for sodium ion battery and preparation method for porous cubic ZnSO3@graphene negative electrode material

A sodium-ion battery and graphene-coated technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable material structure, volume change, and poor cycle performance, and achieve improved electrochemical performance and long-term cycle performance. The effect of long life and low cost

Active Publication Date: 2016-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, as a sodium-ion battery, since Sn is active in the process of storing sodium, it can form an alloy with Na (Na 15 sn 4 ), so Sn is widely used as the negative electrode material of sodium ion battery, but the volume change easily caused by the alloying process of Sn and sodium, the structure of the material is unstable
The cycle performance of the material itself is poor

Method used

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  • Porous cubic ZnSO3@graphene negative electrode material used for sodium ion battery and preparation method for porous cubic ZnSO3@graphene negative electrode material
  • Porous cubic ZnSO3@graphene negative electrode material used for sodium ion battery and preparation method for porous cubic ZnSO3@graphene negative electrode material
  • Porous cubic ZnSO3@graphene negative electrode material used for sodium ion battery and preparation method for porous cubic ZnSO3@graphene negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 20mmol of zinc sulfate heptahydrate in 100ml of deionized water to form solution A, dissolve 20mmol of tin tetrachloride pentahydrate in 200ml of deionized water to form solution B, mix the two solutions, and stir magnetically at 30°C for 8h , carry out centrifugal drying, and calcinate the dried product in the air atmosphere for 2h, the calcination temperature is 600°C, and the heating rate is 5°C / min, and the porous cubic ZnSnO 3 .

[0033] 0.4gZnSnO 3 Ultrasonic dispersion in 200ml of ethanol, adding 4ml of 3-aminopropyl triethoxy silicon, magnetically stirred at 30°C for 12h, then added 50ml of pre-dispersed graphene oxide aqueous solution (2mg / ml) and continued to stir for 6h, centrifuged after stirring Drying, heat treatment in Ar atmosphere for 2h, the heat treatment temperature is 600°C, and the heating rate is 5°C / min, to obtain ZnSnO 3 rGO composite with a carbon content of 17 wt%.

[0034] Mix the material obtained in Example 1, conductive carbon ...

Embodiment 2

[0040] Dissolve 10mmol of zinc sulfate heptahydrate in 100ml of deionized water to form solution A, dissolve 10mmol of sodium stannate trihydrate in 100ml of deionized water to form solution B, mix the two solutions, and stir magnetically at 30°C for 12h, Centrifugal drying was carried out, and the dried product was calcined for 2 hours in an air atmosphere at a calcination temperature of 550°C and a heating rate of 5°C / min to obtain porous cubic ZnSnO 3 .

[0041] 0.4gZnSnO 3 Ultrasonic dispersion in 200ml of deionized water, adding 1.2g of cetyltrimethylammonium bromide, stirring magnetically at 30°C for 12h, then adding 60ml of pre-dispersed graphene oxide aqueous solution (2mg / ml) and continuing to stir for 6h, stirring After the end, centrifugal drying was carried out, and heat treatment was carried out under Ar atmosphere for 2h, the heat treatment temperature was 600°C, and the heating rate was 5°C / min to obtain ZnSnO 3 rGO composite with a carbon content of 25 wt%. ...

Embodiment 3

[0043] Dissolve 20mmol of zinc sulfate heptahydrate in 100ml of deionized water to form solution A, dissolve 20mmol of sodium stannate trihydrate in 100ml of deionized water + 100ml of absolute alcohol to form solution B, mix the two solutions, and heat at 50°C Stir magnetically at high temperature for 6 hours, and perform centrifugal drying. The dried product is calcined in air atmosphere for 2 hours. The calcining temperature is 550°C, and the heating rate is 5°C / min, to obtain porous cubic ZnSnO 3 .

[0044] 0.5gZnSnO 3 Ultrasonic disperse in 200ml of dimethylformamide, add 5ml of 3-aminopropyltrimethoxysilane, stir magnetically at 30°C for 12h, add 60ml of pre-dispersed graphene oxide aqueous solution (3mg / ml) and continue stirring for 6h, stir After the end, centrifugal drying was carried out, and heat treatment was carried out under Ar atmosphere for 4h, the heat treatment temperature was 600°C, and the heating rate was 2°C / min to obtain ZnSnO 3 rGO composite with a ca...

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Abstract

The invention discloses a negative electrode material used for a sodium ion battery and a preparation method for the negative electrode material. The negative electrode material is the porous cubic ZnSO3 composite material coated with graphene; the preparation method comprises the following steps: mixing and stirring a mixed solution containing zinc salt and tin salt for a certain time, and filtering, drying and calcining to obtain the porous cubic ZnSO3; performing ultrasonic dispersion on the ZnSO3 to disperse the ZnSO3 into the solution and adding a surfactant to stir, then mixing and stirring with a graphene oxide water solution, and filtering, drying and thermal processing to obtain the porous cubic ZnSO3 coated with graphene. When the composite material is used for the sodium ion battery, high specific capacity, long cycle life and excellent rate capability of the sodium ion battery are achieved; and meanwhile, the preparation method has the characteristics of simple operation, environment-friendliness, low energy consumption and low cost, and industrial large-scale production can be achieved easily.

Description

technical field [0001] The present invention relates to a porous cubic ZnSnO for sodium ion batteries 3 A graphene negative electrode material and a preparation method thereof belong to the technical fields of energy storage materials and sodium ion batteries. Background technique [0002] Due to the wide distribution of sodium resources, abundant reserves, the abundance of the earth's crust is about 2.74%, the cost of raw materials is low, and sodium and lithium are the same main group element with similar chemical properties, so sodium-ion batteries are considered to be very promising secondary batteries , may replace lithium-ion batteries in the future, and has become a research hotspot and focus in the field of green energy. In the research and exploration of sodium-ion batteries, because the more mature graphite anodes and silicon / carbon anodes in lithium-ion batteries cannot effectively store sodium, exploring a low-cost, high-performance anode material has become the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCH01M4/362H01M4/5825H01M4/587H01M10/054Y02E60/10
Inventor 张治安付云张凯宋俊肖杨富华赖延清李劼
Owner CENT SOUTH UNIV
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