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A kind of preparation method of cobalt oxide modified carbon nanosphere electrode material

A technology of carbon nanospheres and electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem of poor sulfur fixation effect of porous carbon materials, achieve good cycle stability, increase attachment points, and make the preparation process safe Effect

Active Publication Date: 2021-07-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the example of lithium-sulfur battery application, the sulfur-fixing effect of porous carbon materials is not very ideal, so it is usually compounded with other materials to improve its sulfur-fixing effect

Method used

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  • A kind of preparation method of cobalt oxide modified carbon nanosphere electrode material
  • A kind of preparation method of cobalt oxide modified carbon nanosphere electrode material
  • A kind of preparation method of cobalt oxide modified carbon nanosphere electrode material

Examples

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Embodiment 1

[0036] (1) Take 0.1g Na 2 CO 3 , 0.1g SDS was evenly dispersed in 150mL deionized water, degassed with nitrogen for 30min, then raised the temperature to 60°C, added 10mL styrene to emulsify for half an hour, raised the temperature to 75°C, added 7.5mL containing 0.031g K 2 S 2 o 8 The aqueous solution was reacted for 20 hours to obtain a milky white polystyrene PS microsphere emulsion with a particle size of 90-130nm.

[0037] (2) Take 20mL of the PS microsphere emulsion obtained in step (1) and disperse it in 100mL Tris buffer (20×10 -3 M), add 100mL aqueous solution containing 150mg dopamine hydrochloride, then dropwise add 10mL containing 400mg Co(NO 3 ) 2 The aqueous solution was stirred evenly, and after 24 hours of reaction, it was suction filtered to obtain a black solid; it was dispersed in 100mL Tris buffer (20×10 -3 In M), add 80 mL of an aqueous solution containing 150 mg of dopamine hydrochloride, stir well, react for 24 hours and then suction filter and vac...

Embodiment 2

[0042] (1) Take 0.1g Na 2 CO 3 , 0.1g SDS was evenly dispersed in 150mL deionized water, degassed with nitrogen for 30min, then raised the temperature to 60°C, added 10mL styrene to emulsify for half an hour, raised the temperature to 75°C, added 7.5mL containing 0.031g K 2 S 2 o 8 The aqueous solution was reacted for 20 hours to obtain a milky white polystyrene PS microsphere emulsion with a particle size of 90-130nm.

[0043] (2) Take 20mL of the PS microsphere emulsion obtained in step (1) and disperse it in 100mL Tris buffer (20×10 -3M), add 100mL aqueous solution containing 200mg dopamine hydrochloride, then dropwise add 10mL containing 200mg Co(NO 3 ) 2 The aqueous solution was stirred evenly, and after 24 hours of reaction, it was suction filtered to obtain a black solid; it was dispersed in 100mL Tris buffer (20×10 -3 M), add 100mL of an aqueous solution containing 200mg of dopamine hydrochloride, stir evenly, react for 24 hours and then suction filter and vacuum...

Embodiment 3

[0047] (1) Take 0.1g Na 2 CO 3 , 0.1g SDS was evenly dispersed in 150mL deionized water, degassed with nitrogen for 30min, then raised the temperature to 60°C, added 10mL styrene to emulsify for half an hour, raised the temperature to 75°C, added 7.5mL containing 0.031g K 2 S 2 o 8 The aqueous solution was reacted for 20 hours to obtain a milky white polystyrene PS microsphere emulsion with a particle size of 90-130nm.

[0048] (2) Take 20mL of the PS microsphere emulsion obtained in step (1) and disperse it in 100mL Tris buffer (20×10 -3 M), add 100mL aqueous solution containing 250mg dopamine hydrochloride, then dropwise add 10mL containing 300mg Co(NO 3 ) 2 The aqueous solution was stirred evenly, and after 24 hours of reaction, it was suction filtered to obtain a black solid; it was dispersed in 100mL Tris buffer (20×10 -3 In M), add 100 mL of an aqueous solution containing 250 mg of dopamine hydrochloride, stir well, react for 24 hours and then suction filter and va...

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Abstract

The invention relates to a preparation method of a cobalt oxide-modified carbon nanosphere electrode material, comprising: using styrene as a monomer emulsion polymerization to obtain a PS microsphere emulsion; dispersing in a Tris buffer solution, adding a dopamine hydrochloride aqueous solution, and then adding the PS microsphere emulsion drop by drop Stir the cobalt source solution evenly, carry out the reaction, obtain a black solid by suction filtration, disperse it in the Tris buffer again, add dopamine hydrochloride aqueous solution, stir well, carry out the reaction again, and obtain PS@PDA by suction filtration and vacuum drying; place in an inert atmosphere Calcined in the middle, and then taken out and placed in the air for calcination, that is. The method of the present invention is simple, easy to implement, safe and environmentally friendly, and low in cost. The prepared cobalt oxide-modified carbon nanospheres can be used as a conductive framework for loading sulfur S to make up for the defect of poor conductivity of elemental sulfur, and at the same time, through the adsorption of polysulfides, It can reduce the dissolution of sulfur in the electrolyte, and has good cycle stability while ensuring a certain specific capacity.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur electrode materials, in particular to a method for preparing a cobalt oxide-modified carbon nanosphere electrode material. Background technique [0002] Energy is an indispensable material basis in the process of human life and production, and the shortage of energy has become an important problem that today's society must face. The theoretical energy density of lithium-sulfur batteries is 2600Wh / kg, which is 3 to 5 times that of commercial lithium-ion batteries. It is a promising electrochemical energy storage system and has attracted extensive attention from researchers in recent years. [0003] The poor conductivity of sulfur and the shuttle effect of polysulfides have been the main factors restricting the development of lithium-sulfur battery technology. The most straightforward way to solve the problem of poor electrical conductivity of battery electrodes is to use a suitable electronic conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/052H01M4/583H01M4/62
CPCH01M4/362H01M4/525H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 邹儒佳师雨婷胡俊青张剑华崔哲徐超霆何书昂唐蓉
Owner DONGHUA UNIV