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Preparation method and application of nitrogen-doped porous carbon coated cobalt diselenide composite material

A technology of nitrogen-doped porous carbon and cobalt diselenide is applied in the preparation/purification of carbon, binary selenium/tellurium compounds, metal selenide/tellurium compounds, etc. Insufficient volume expansion limit and other problems, to achieve the effect of reducing interface resistance, improving cycle stability, and good application prospects

Active Publication Date: 2022-03-25
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coating by carbon layer is a common method for improving the electrochemical performance of selenides, but there are still problems such as insufficient coating, insufficient volume expansion restriction, and particle pulverization.

Method used

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  • Preparation method and application of nitrogen-doped porous carbon coated cobalt diselenide composite material
  • Preparation method and application of nitrogen-doped porous carbon coated cobalt diselenide composite material
  • Preparation method and application of nitrogen-doped porous carbon coated cobalt diselenide composite material

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Experimental program
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Effect test

Embodiment 1

[0043] A method for preparing a nitrogen-doped porous carbon-coated cobalt diselenide negative electrode material and its application, comprising the following steps:

[0044] Will Co(NO 3 ) 2 ·6H 2 O (0.291g) and selenium powder (0.157g) were dissolved in methanol respectively, and magnetically stirred for 2h, and the evenly dispersed methanol solution of selenium powder was quickly poured into Co(NO 3 ) 2 ·6H 2 O methanol solution, then add 0.5g liquid acrylonitrile oligomer, and continue to stir for 2h, until the methanol solution is uniformly dispersed, measure 5mL of hydrazine hydrate solution (mass fraction is 85%), and quickly add to the uniformly dispersed methanol solution In the process, after the solution is cooled, transfer the solution to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours. After cooling to room temperature, collect the precipitate by centrifugation, dry it at a heating rate of 5°C / min to 600°C, and keep it ...

Embodiment 2

[0046] Will Co(NO 3 ) 2 ·6H 2 O (0.268g) and selenium powder (0.144g) were dissolved in methanol respectively, and magnetically stirred for 1h, and the evenly dispersed methanol solution of selenium powder was quickly poured into Co(NO 3 ) 2 ·6H 2 O methanol solution, then add 1g of liquid acrylonitrile oligomer, and continue to stir for 1h, until the methanol solution is evenly dispersed, measure 5mL of hydrazine hydrate solution (mass fraction is 85%), and quickly add it to the uniformly dispersed methanol solution , after the solution is cooled, transfer the solution to a hydrothermal reaction kettle, conduct a hydrothermal reaction at 160°C for 30 hours, and after cooling to room temperature, collect the precipitate by centrifugation, dry it at a heating rate of 8°C / min to 800°C, and keep it for 4 hours. Used to remove residual selenium powder. After cooling, grind and sieve to prepare nitrogen-doped carbon-coated cobalt diselenide composite material.

Embodiment 3

[0048] Will Co(NO 3 ) 2 ·6H 2 O (0.268g) and selenium powder (0.144g) were dissolved in methanol respectively, and magnetically stirred for 3h, and the evenly dispersed methanol solution of selenium powder was quickly poured into Co(NO 3 ) 2 ·6H 2 O methanol solution, then add 0.8g liquid acrylonitrile oligomer, and continue to stir for 3h, until the methanol solution is uniformly dispersed, measure 8mL of hydrazine hydrate solution (mass fraction is 85%), and quickly add to the uniformly dispersed methanol solution After the solution is cooled, transfer the solution to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 170°C for 26 hours. After cooling to room temperature, collect the precipitate by centrifugation, dry it at a rate of 5°C / min to 700°C, and keep it for 5 hours. , used to remove residual selenium powder. After cooling, grind and sieve to prepare nitrogen-doped carbon-coated cobalt diselenide composite material.

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Abstract

The invention relates to a preparation method and application of a nitrogen-doped porous carbon-coated cobalt diselenide composite material, and the preparation method comprises the following steps: respectively dissolving cobalt salt and selenium powder in a solvent, and carrying out first stirring to respectively obtain a cobalt salt solution and a selenium powder solution; pouring the selenium powder solution into the cobalt salt solution, adding a liquid acrylonitrile oligomer, stirring for the second time, and adding a hydrazine hydrate solution after stirring to obtain a mixed solution; transferring the mixed solution into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and then cooling, centrifuging and drying to obtain a precipitate; and calcining the precipitate, cooling, grinding and sieving to obtain the nitrogen-doped porous carbon coated cobalt diselenide composite material. The prepared nitrogen-doped porous carbon coated cobalt diselenide composite material is prepared into a lithium ion battery negative electrode, and the lithium ion battery negative electrode still has the specific discharge capacity of 644mAh / g after 300 times of charge-discharge cycles under the current density of 0.2 A / g.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method and application of a nitrogen-doped porous carbon-coated cobalt diselenide composite material. Background technique [0002] Lithium-ion batteries have attracted extensive attention due to their excellent high operating voltage, high energy efficiency, long cycle life, and their clean and environmentally friendly characteristics. They are currently the most widely used type of energy storage devices in the market. Transition metal chalcogenides (TMCs) have good lithium storage performance and high safety performance. It can be used as a negative electrode material for lithium ion batteries. For example, cobalt selenide and its compounds show excellent performance in energy storage devices such as hybrid vehicles and portable electronic devices. As a new type of anode material for lithium-ion batteries, transition metal dichalcogenides have the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C01B32/05H01M4/36H01M4/58H01M4/62H01M10/0525
CPCC01B19/007C01B32/05H01M4/366H01M4/581H01M4/625H01M4/628H01M10/0525C01P2002/72C01P2004/03C01P2004/04C01P2006/40C01P2004/62C01P2004/61C01P2004/80Y02E60/10
Inventor 刘剑洪扶勇欢黎烈武张黔玲叶盛华黄少銮熊威陈文沛陈超
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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