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Tin bisulfide nanosheet composite material, as well as preparation method and application thereof

A technology of tin disulfide and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of restricting charge and discharge capacity, low conductivity, etc., and achieve easy operation and large surface area , The effect of simple preparation method

Active Publication Date: 2015-06-17
太湖县市场监督检验所(太湖县功能膜检测研究院)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tin disulfide has low electrical conductivity, which limits its charge-discharge capacity at high current densities.

Method used

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  • Tin bisulfide nanosheet composite material, as well as preparation method and application thereof
  • Tin bisulfide nanosheet composite material, as well as preparation method and application thereof
  • Tin bisulfide nanosheet composite material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the tin disulfide nanosheet composite material of this example is as follows:

[0029] (1) 20ml 0.04mol / L tin tetrachloride aqueous solution and 20ml 0.16mol / L L-cysteine ​​were mixed together to make a reaction solution, and the reaction solution was transferred to a 50ml polytetrafluoro container , and fix the polytetrafluoroethylene container in a stainless steel reaction kettle, and then use an oven to directly heat it at 200°C for 20 hours. When the temperature of the reaction kettle naturally drops to room temperature, wash the obtained reactants with water and ethanol for 3 times in sequence. The washed sample was dried in an oven at 50° C. for 12 hours to obtain flower-shaped tin disulfide nanosheets; wherein, the concentration of tin tetrachloride in the reaction solution was 0.02 mol / L.

[0030] (2) Then the tin disulfide prepared in step (1) and oleic acid were mixed and ultrasonicated for 1 hour according to the weight ratio of 1:40...

Embodiment 2

[0035] In this example, 20ml of 0.2mol / L tin tetrachloride aqueous solution and 20ml of 0.8mol / L L-cysteine ​​are mixed together to prepare tin disulfide, and the oven is directly heated at 240°C for 20 hours, that is Say, the hydrothermal reaction temperature is 240°C. In step (2), tin disulfide and oleic acid are mixed and ultrasonicated for 1 hour at a weight ratio of 1:60, soaked for 48 hours, and centrifuged to remove excess oleic acid. All the other steps and conditions are the same as in Example 1.

[0036] The composite material prepared in this example was observed with a scanning electron microscope, and the results showed that the size of the amorphous carbon-coated tin disulfide nanosheets in this example was about 3 microns, and the thickness of the nanosheets was about 10 nm. It is measured that in the composite material of this example, the amorphous carbon content accounts for 13.7% of the total weight of the amorphous carbon-coated tin disulfide nanosheet comp...

Embodiment 3

[0039] In this example, 20ml of 0.1mol / L tin tetrachloride aqueous solution and 20ml of 0.4mol / L L-cysteine ​​are mixed together to prepare tin disulfide, and the oven is directly heated at 180°C for 20 hours, that is Say, the hydrothermal reaction temperature is 180°C. In step (2), tin disulfide and oleic acid are mixed and ultrasonicated at a weight ratio of 1:50 for 1 hour, soaked for 36 hours, and centrifuged to remove excess oleic acid. All the other steps and conditions are the same as in Example 1.

[0040] A scanning electron microscope was used to observe the composite material prepared in this example. The results showed that the size of the amorphous carbon-coated tin disulfide nanosheets in this example was about 3.5 microns, and the thickness of the nanosheets was about 10 nanometers. It is measured that in the composite material of this example, the amorphous carbon content accounts for 14% of the total weight of the amorphous carbon-coated tin disulfide nanoshee...

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Abstract

The invention discloses a tin bisulfide nanosheet composite material, as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) uniformly mixing a tin source and an L-cysteine solution, performing heating reaction for 5 to 30 hours, naturally cooling the reaction product, and alternately washing the reaction product with water and ethanol to obtain a flower-like tin bisulfide nanosheet; (2) mixing tin bisulfide and oleic acid according to the weight ratio of (1 to 20) to (1 to 60), performing soaking for 24 to 48 hours, centrifugally removing redundant oleic acid, and performing heating for 1 to 8 hours in the inert gas atmosphere of 400 to 1,000 DEG C to obtain an amorphous carbon-coated tin bisulfide nanosheet composite material. According to the method, amorphous carbon is formed by oleic acid adsorption material surface annealing, and the surface of the flower-like tin bisulfide nanosheet prepared by a hydrothermal method is coated with an amorphous carbon layer, so that the method is simple and easy to operate; the prepared amorphous carbon-coated tin bisulfide nanosheet composite material is large in surface area and thin, and has the characteristics of high cycling stability, high rate capacity and the like when being used as a battery cathode.

Description

technical field [0001] The present application relates to the field of negative electrode materials for lithium ion batteries, in particular to a tin disulfide nanosheet composite material and its preparation method and application. Background technique [0002] With the depletion of petrochemical energy and the pressure of environmental deterioration, the development of electric vehicles and hybrid electric vehicles is imperative. At present, the power supply, which is one of the core technologies of electric vehicles, is the bottleneck for the rapid development of electric vehicles. Compared with other secondary power sources, lithium-ion batteries have the advantages of high energy density, high power density, and environmental protection, and are considered to be one of the most promising power sources. However, its low capacity is still an important issue, especially the capacity of its commercially applied graphite anode is about 370 mAh / g. The current focus of resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5815H01M10/0525Y02E60/10
Inventor 李秀马建民毛玉华
Owner 太湖县市场监督检验所(太湖县功能膜检测研究院)
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