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A kind of ni@n-c composite positive electrode material, preparation method and application in lithium-air battery

A composite positive electrode material, lithium-air battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of simple and reliable operation, environmental friendliness and low cost

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material is used in lithium-air batteries, and the electrical properties such as cycle stability need to be improved

Method used

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  • A kind of ni@n-c composite positive electrode material, preparation method and application in lithium-air battery
  • A kind of ni@n-c composite positive electrode material, preparation method and application in lithium-air battery
  • A kind of ni@n-c composite positive electrode material, preparation method and application in lithium-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First, weigh 2.0 g of chitosan, add them into a beaker containing 30 mL of water, and stir to form a suspension; 1.0 g of nickel acetate is dissolved in 10 mL of water to form a nickel acetate solution. Measure a certain amount of glacial acetic acid to form a 5vol% acetic acid solution, and slowly add the acetic acid solution dropwise to the chitosan suspension under stirring conditions. With the addition of acetic acid, the suspension gradually becomes transparent and forms Viscous glue; nickel acetate solution was added dropwise to the above transparent glue to form a green clear glue (mixed solution; pH 4.5; chitosan concentration 20mg / mL), freeze-dried for 24 hours to obtain the precursor.

[0063] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, raise the temperature of the tube furnace to 1000°C at a heating rate of 2°C / min, and heat-preserve for 3 hours to obtain the Ni@N...

Embodiment 2

[0070] First, weigh 2.0g of chitosan respectively, add them into a beaker containing 30mL of water, and stir to form a suspension; 0.8g of nickel acetate is dissolved in 10mL of water to form a nickel acetate solution. Measure a certain amount of glacial acetic acid to form a 10vol% acetic acid solution, and slowly add the acetic acid solution dropwise to the suspension of chitosan under stirring conditions. With the addition of acetic acid, the suspension gradually becomes transparent and forms Viscous glue; nickel acetate solution was added dropwise to the above transparent glue to form a green clear glue (mixed solution; pH 4.5; chitosan concentration 18mg / mL), freeze-dried for 18 hours to obtain the precursor.

[0071] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, raise the temperature of the tube furnace to 900°C at a rate of 3°C / min, and heat-treat for 3 hours to obtain the Ni@...

Embodiment 3

[0076] First, weigh 2.0 g of chitosan, add them into a beaker containing 30 mL of water, and stir to form a suspension; 0.5 g of nickel acetate is dissolved in 10 mL of water to form a nickel acetate solution. Measure a certain amount of glacial acetic acid to form a 5vol% acetic acid solution, and slowly add the acetic acid solution dropwise to the chitosan suspension under stirring conditions. With the addition of acetic acid, the suspension gradually becomes transparent and forms Viscous glue; nickel acetate solution was added dropwise to the above transparent glue to form a green clear glue (mixed solution; pH 4.5; chitosan concentration 15mg / mL), freeze-dried for 12 hours to obtain the precursor.

[0077] Weigh an appropriate amount of precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, raise the temperature of the tube furnace to 800°C at a heating rate of 3°C / min, and heat-preserve for 6 hours to obtain the Ni@N-...

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Abstract

The invention discloses a preparation method of a Ni@N-C composite cathode material. The preparation method comprises the steps of: 1) freeze-drying a mixture solution containing weak acid, chitosan and a nickel source to prepare a precursor; 2) sintering the precursor at 800 DEG C or more to produce the composite cathode material, wherein the mass ratio of the chitosan to the nickel source is 1:1-5:1. The invention also discloses the composite cathode material which is produced through the preparation method and an application of the composite cathode material in lithium-air batteries. In the Ni@N-C composite cathode material, nano nickel-particles uniformly grow in interior and on surfaces of nitrogen-doped carbon which is formed from chitosan, so that the composite material is low in overpotential, high in specific capacity and excellent in cycle performance when being used as a catalyst material in the lithium-air batteries. The preparation method is simple and low-cost. The composite material also has great researching prospect.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and specifically relates to the field of preparation of positive electrode materials for lithium-air batteries. Background technique [0002] Li-air batteries have a theoretical energy density of up to 11700Wh kg -1 And become one of the attractive high energy density secondary battery systems. However, lithium-air batteries face problems such as severe polarization during charging and discharging, poor power performance, and insufficient cycle performance in practical applications. Catalyst materials, that is, cathode materials, are an important part of lithium-air batteries, which can effectively promote the kinetics of lithium-air battery electrode reactions, and are the key to the large-scale application of lithium-air batteries. Noble metal catalysts have excellent catalytic performance, but are difficult to be applied on a large scale due to their high cost and resource shortag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395H01M4/362H01M4/38H01M4/583Y02E60/10
Inventor 张治安宋俊肖吕晓军赖延清李煌旭焦一峰
Owner CENT SOUTH UNIV
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