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A nano-flower spherical cobalt disulfide composite material and a preparation method thereof

A cobalt disulfide, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor long-term cycle performance of batteries and complicated preparation procedures, and achieve enhanced electrochemical performance. , The preparation method is simple, and the effect is conducive to infiltration

Active Publication Date: 2019-01-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Based on the existing patents and literature, it can be seen that the current anode materials for cobalt disulfide sodium ion batteries have problems such as complex preparation procedures and poor long-term battery cycle performance.

Method used

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  • A nano-flower spherical cobalt disulfide composite material and a preparation method thereof
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  • A nano-flower spherical cobalt disulfide composite material and a preparation method thereof

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preparation example Construction

[0033] The invention provides a preparation method of a nano flower spherical cobalt disulfide composite material, comprising: S1) mixing an organic acid cobalt salt, an organic sulfur source and a glycol solvent, and obtaining an intermediate product after a hydrothermal reaction; the organic The sulfur source contains amino groups; S2) The intermediate product is mixed with sulfur powder, and annealed in a protective atmosphere to obtain a nano flower spherical cobalt disulfide composite material.

[0034]see figure 1 , figure 1 It is a schematic diagram of the synthesis of the nanoflower spherical cobalt disulfide composite material provided by the present invention, which utilizes hydrothermal reaction self-assembly to form the nanoflower spherical cobalt disulfide composite material.

[0035] The preparation method of the invention is simple, the cycle is short and the efficiency is high. In this method, only one step of hydrothermal self-assembly is required to form th...

Embodiment 1

[0051] Mix 3.0g of cobalt oxalate tetrahydrate and 1.04g of thiourea into a beaker filled with 70ml of ethylene glycol and stir in a water bath. The temperature of the water bath is 45°C and the stirring time is 15 minutes; The stainless steel reaction kettle was sealed, and then the stainless steel reaction kettle was placed in a blast oven at 180°C and kept at a constant temperature for 12 hours.

[0052] After the reaction, take out the suspension in the reaction kettle, wash it with ethanol, then centrifuge the suspension, set the centrifugal speed to 10000r / min, and the centrifugation time is 20min; put the separated solid precipitate into In a vacuum oven at 50° C., take it out after baking for 10 hours to obtain an intermediate product.

[0053] Take 2g of the intermediate product, mix it with 2g of sulfur powder, and put it into a tube furnace for annealing. The atmosphere in the tube furnace is argon, the heating rate of the annealing treatment is 5°C / min, the holdin...

Embodiment 2

[0057] Take 3.0g of cobalt oxalate tetrahydrate and 1.04g of thiourea and mix them into a beaker filled with 50ml of ethylene glycol for stirring in a water bath. The temperature of the water bath is 45°C and the stirring time is 15 minutes. Pour the homogeneous solution after mixing and dissolving into a stainless steel reaction kettle and seal it, then put the stainless steel reaction kettle into a blast oven at 180°C, and place it at a constant temperature for 6h.

[0058] After the reaction, the suspension in the reactor was taken out, washed twice with water, and then washed twice with ethanol. The suspension was centrifuged, the centrifugation speed was set to 10000r / min, and the centrifugation time was 20min. The separated solid precipitate was put into a vacuum oven at 50° C., baked for 10 h, and then taken out to obtain an intermediate product.

[0059] Take 2g of the intermediate product, mix it with 3g of sulfur powder, and put it into a tube furnace for annealing....

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Abstract

The invention provides a preparation method of a nanometer flower spherical cobalt disulfide composite material, comprising the following steps: S1) mixing an organic acid cobalt salt and an organic sulfur source with a diol solvent, and obtaining an intermediate product after hydrothermal reaction. The organic sulfur source contains amino groups; S2) mixing the intermediate product with sulfur powder and annealing in a protective atmosphere to obtain a nano-flower spherical cobalt disulfide composite material. In accordance with that prior art, the above preparation method is simple, Short cycle and high efficiency, and the folded cobalt disulfide nanosheets have larger specific surface area, conducive to the exchange and transfer of sodium ions and electrons, but also conducive to the infiltration of electrolyte,at the same time, the carbon layer doped with nitrogen on the surface can enhance the conductivity of cobalt disulfide and provide a protective layer when cobalt disulfide electrochemically reacts, which buffers the internal stress caused by the volume change of cobalt disulfide, which is beneficial to the structural stability of cobalt disulfide and enhances the structural strength of the composite.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a nano flower spherical cobalt disulfide composite material and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles, there is an increasing demand for high-energy-density battery devices, and higher requirements are placed on the energy storage performance per unit mass of batteries. Among them, sodium-ion battery energy storage technology is considered to be the most potential alternative energy storage device for lithium-ion batteries. [0003] Compared with the scarce reserves of lithium-containing ore in lithium-ion batteries and the rising high prices, the cost of raw materials for sodium-ion batteries is lower, and the natural reserves of raw material sodium salts are very rich and come from a wide range of sources. Therefore, sodium-ion battery technology has be...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5815H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张和平潘月磊程旭东龚伦伦
Owner UNIV OF SCI & TECH OF CHINA
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