Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material

A composite positive electrode material and porous carbon material technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of prominent shuttle effect, complex process, low selenium loading, etc., to improve stability and electrochemical performance, The process is simple and the effect of reducing the cost of the process

Inactive Publication Date: 2018-03-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products and preparation methods of lithium-selenium battery composite cathode materials currently reported have shortcomings such as complex process, low selenium loading, and prominent shuttle effect, which need to be further improved.

Method used

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  • Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material
  • Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material
  • Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material

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Effect test

Embodiment 1

[0047] A nitrogen-doped flower-like hierarchical structure porous carbon material, the preparation method of which is as follows:

[0048] 1) Disperse 8.1g zinc acetate dihydrate and 4g P123 in 100ml deionized water, add 2.3g sodium glutamate under stirring condition, stir and react for 30min, the resulting product is washed 5 times with deionized water and ethanol respectively, and in Dry overnight in an oven at 60°C to obtain the precursor zinc glutamic acid;

[0049]2) Put the precursor zinc glutamate obtained in step 1) in a tube furnace, and in an argon atmosphere, raise the temperature to 100°C at a rate of 2°C / min and keep it for 120min, then raise the temperature to 400°C and keep it for 120min, and finally raise the temperature Keep warm at 800°C for 300 minutes, then cool naturally to room temperature with the furnace to obtain solid powder;

[0050] 3) Soak the solid powder obtained in step 2) in 2 mol of hydrochloric acid for 12 hours, then perform suction filtrat...

Embodiment 2

[0053] A nitrogen-doped flower-like hierarchical structure porous carbon material, the preparation method of which is as follows:

[0054] 1) Disperse 10.8g zinc acetate dihydrate and 5g P123 in 100ml deionized water, add 2.3g sodium glutamate under stirring condition, stir and react for 30min, the resulting product is washed 5 times with deionized water and ethanol respectively, and in Dry overnight in an oven at 60°C to obtain the precursor zinc glutamic acid;

[0055] 2) Place the precursor zinc glutamate obtained in step 1) in a tube furnace, and in an argon atmosphere, raise the temperature to 200°C at a rate of 5°C / min and keep it for 100 minutes, then raise the temperature to 500°C and keep it for 100 minutes, and finally raise the temperature Keep warm at 900°C for 400 minutes, then cool naturally to room temperature with the furnace to obtain solid powder;

[0056] 3) Soak the solid powder obtained in step 2) in 3 mol of hydrochloric acid for 24 hours, then perform s...

Embodiment 3

[0059] A nitrogen-doped flower-like hierarchical structure porous carbon material, the preparation method of which is as follows:

[0060] 1) Disperse 13.5g zinc acetate dihydrate and 6g P123 in 100ml deionized water, add 2.3g sodium glutamate under stirring condition, stir and react for 30min, the resulting product is washed 5 times with deionized water and ethanol respectively, and in Dry overnight in an oven at 60°C to obtain the precursor zinc glutamic acid;

[0061] 2) Put the precursor zinc glutamate obtained in step 1) in a tube furnace, and in an argon atmosphere, raise the temperature to 200°C at a rate of 5°C / min and keep it for 200 minutes, then raise the temperature to 500°C and keep it for 200 minutes, and finally raise the temperature Keep warm at 800°C for 400 minutes, then cool naturally to room temperature with the furnace to obtain solid powder;

[0062] 3) Soak the solid powder obtained in step 2) in 4 mol of hydrochloric acid for 12 hours, then perform suc...

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Abstract

The invention discloses a flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and a preparation method and application of such material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material prepared by a melt diffusion method can be sufficiently infiltrated by electrolyte and shorten an electron transmission route, and microporous and mesoporous structures can increase selenium load capacity and well restrict the selenium shuttle effect; macropores are beneficial to sufficient contact between the electrolyte and active substances and effectively enhance cycling stability and a capacity retention ratio of a composite electrode prepared from the material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material has the advantages of high specific capacity, good cycle performance and excellent rate capability, and the preparation method is simple, thereby being of great popularization and application significance.

Description

technical field [0001] The invention belongs to the fields of electrochemistry and new energy, and in particular relates to a nitrogen-doped flower-like hierarchical structure porous carbon-selenium composite positive electrode material and a preparation method and application thereof. Background technique [0002] Rechargeable lithium-ion batteries (LIBs) are considered to be the most promising components for portable electronic devices and emerging electric vehicles; however, the relatively low energy density of typical LIBs largely limits their large-scale applications. As the next generation of metal batteries, lithium (Li-S) batteries have attracted great attention due to their non-toxic, low-cost, high theoretical capacity and energy density. Nevertheless, the insulating properties of Li-S batteries, the solubility of the intermediate lithium polymer during cycling, will lead to the redox shuttling effect and Li 2 S is deposited on the Li anode, resulting in low Coulo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 李昱董文达王佩琪陈浩吴思嘉赵珺王洪恩陈丽华苏宝连
Owner WUHAN UNIV OF TECH
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