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A kind of stannous sulfide carbon composite material and its preparation method and application

A technology of carbon composite materials and stannous sulfide, applied in chemical instruments and methods, carbon preparation/purification, tin compounds, etc., can solve the problems of complex structure, low conductivity, limited sodium storage capacity, etc., and achieve structural stability properties, suppress volume change, and improve conductivity

Active Publication Date: 2022-04-29
中博龙辉装备集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hard carbon anode is an earlier anode material for sodium-ion batteries. It is different from graphite in that sodium ions can be adsorbed on the surface, pores, edges, and defect positions of carbon materials, and a small amount of intercalation between carbon layers, but its sodium storage capacity is limited.
The second category is titanium-based compounds, such as Na 2 Ti 3 o 7 ,TiO 2 , NaTi 2 (PO 4 ) 3 , they have a stable crystal structure that facilitates the intercalation and deintercalation of sodium ions in three dimensions, but their sodium storage capacity is also very limited (~200mAhg -1 )
The third category is alloy materials, such as Sn, Ge, Sb and P, etc., which all have high theoretical specific capacity (such as P: 2600mAhg -1 ), but there is a huge volume change during the sodium intercalation / extraction process, and the conductivity of this type of material is low, which is not conducive to high rate charge and discharge
The above methods have complex structures and are difficult to precisely control the synthesis method.

Method used

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  • A kind of stannous sulfide carbon composite material and its preparation method and application
  • A kind of stannous sulfide carbon composite material and its preparation method and application
  • A kind of stannous sulfide carbon composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0028] With 1.25g of SnCl 4 and 0.1g CTAB (cetyltrimethylammonium bromide) and 0.1g PVP (polyvinylpyrrolidone) in 30ml deionized water were fully stirred for 120min, then 2.7g sucrose and 0.48g oxalic acid were added to the solution, and after another 120min Stir in a water bath to form a clear solution. The hydrothermal reaction was carried out in a stainless steel autoclave with a volume of 50 mL and a polytetrafluoroethylene coating. The hydrothermal temperature was 200 ° C, and the temperature was kept for 10 hours. After completion, it was cooled to room temperature. After cleaning the product with distilled water and ethanol, it was dried in an oven at 60° C. for 12 hours to obtain a tin dioxide porous carbon composite material. The tin dioxide porous carbon composite was placed in a tube furnace under an argon atmosphere for 5 o C / min to raise the temperature to 650°C, keep the heat for 5 hours, and then cool down with the furnace to prepare the tin-carbon composite m...

Embodiment 2

[0033] With 2g of SnCl 4 Mix 0.4g CTAB and 0.8g PVP in 75ml deionized water for 120min, then add 5g sucrose and 0.48g oxalic acid into the solution, and then stir in a water bath for 120min to form a clear solution. The hydrothermal reaction was carried out in a stainless steel autoclave with a volume of 100mL and a polytetrafluoroethylene coating. The hydrothermal temperature was 180°C, kept for 16 hours, and cooled to room temperature after completion. After washing the product with distilled water and ethanol, it was dried in an oven at 60° C. for 12 hours. A tin dioxide porous carbon composite material was prepared. The tin dioxide porous carbon composite was placed in a tube furnace under an argon atmosphere for 5 o C / min to raise the temperature to 600°C, hold the temperature for 3 hours, and then cool down with the furnace to prepare the tin-carbon composite material. The tin-carbon composite material and sulfur powder were ground and mixed thoroughly in a mortar at ...

Embodiment 3

[0037] With 1.5g of SnCl 4 Mix 0.5g CTAB and 0.5g PVP in 75ml deionized water for 240min, then add 7g sucrose and 1.5g oxalic acid into the solution, and then stir in a water bath for 120min to form a clear solution. The hydrothermal reaction was carried out in a stainless steel autoclave with a volume of 100mL and a polytetrafluoroethylene coating. The hydrothermal temperature was 180°C, kept for 24 hours, and cooled to room temperature after completion. After washing the product with distilled water and ethanol, it was dried in an oven at 60° C. for 12 hours. A tin dioxide porous carbon composite material was prepared. The tin dioxide porous carbon composite was placed in a tube furnace under an argon atmosphere for 5 o C / min to raise the temperature to 650°C, hold the temperature for 3 hours, and then cool down with the furnace to prepare the tin-carbon composite material. The tin-carbon composite material and sulfur powder were ground and mixed thoroughly in a mortar at...

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Abstract

The invention discloses a stannous sulfide carbon composite material, a preparation method and application thereof. The preparation method of the present invention adopts tin tetrachloride as a tin source, sucrose as a carbon source, cetyltrimethylammonium bromide and polyvinylpyrrolidone as active agents, oxalic acid as a template, and prepares tin dioxide carbon in a hydrothermal environment. The composite material is further reacted at high temperature in a tube furnace to form a tin-carbon composite material, and the tin-carbon composite material is further mixed with sulfur, and then calcined under the protection of an inert atmosphere to obtain a stannous sulfide-carbon composite material. The raw material price of the present invention is low, and the composite material structure is composed of primary nanoparticles to form secondary microparticles, which can shorten the diffusion path of sodium ions in the material by using primary nanoparticles. In addition, the carbon skeleton composed of secondary microparticles has a porous structure. On the one hand It can not only improve the conductivity of the stannous sulfide, but also effectively inhibit the volume change in the electrochemical reaction of the stannous sulfide, and maintain the structural stability of the electrode.

Description

technical field [0001] The invention relates to the technical field of electrode materials for sodium ion batteries, in particular to a stannous sulfide carbon composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently the most advantageous electrochemical energy storage devices, despite their advantages such as high energy density, long cycle life, high operating voltage, and no memory effect. However, with the development of new energy technologies, the safety and cost issues of lithium-ion batteries have become bottlenecks restricting its further development. The charging and discharging mechanism of sodium-ion batteries is similar to that of lithium-ion batteries, and the sodium reserves are abundant, and the cost is low. Transportation does not need to precharge the battery, improving the safety of battery transportation. Therefore, sodium-ion batteries are promising next-generation secondary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/00C01B32/05H01M4/36H01M4/58H01M4/587H01M10/054
CPCC01G19/00C01B32/05H01M4/364H01M4/5815H01M4/587H01M10/054H01M2004/027C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 李哲东符兵
Owner 中博龙辉装备集团股份有限公司
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