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Foamed nickel self-supported flake-shaped Ni3P/C composite material for sodium ion battery negative electrode and preparation method for composite material

A sodium-ion battery and composite material technology, which is applied to battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of low electronic conductivity of nickel phosphide, affecting rate performance, and unstable structure, and achieves a simple and feasible preparation method. , the effect of high specific capacity and excellent rate performance

Active Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electronic conductivity of nickel phosphide is relatively low, which seriously affects its rate performance.
In addition, since sodium ions are incorporated into Ni 3 The volume expansion caused by P can also easily lead to structural instability and specific capacity decay.

Method used

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  • Foamed nickel self-supported flake-shaped Ni3P/C composite material for sodium ion battery negative electrode and preparation method for composite material
  • Foamed nickel self-supported flake-shaped Ni3P/C composite material for sodium ion battery negative electrode and preparation method for composite material
  • Foamed nickel self-supported flake-shaped Ni3P/C composite material for sodium ion battery negative electrode and preparation method for composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Will 2 * 4cm nickel foam was ultrasonicated in 0.5mol / L sodium hydroxide aqueous solution, absolute ethanol and deionized water for 0.5 hours in sequence.

[0037] 2. Weigh 2.91g of nickel nitrate and dissolve it in 20mL of deionized water to prepare a salt solution with a concentration of 0.5mol / L.

[0038] 3. Add 2.0 g of hexamethylenetetramine to the above salt solution, and stir at 50° C. for 0.5 hour to obtain a mixed solution.

[0039] 4. Put the above mixed solution in an autoclave, and place the treated nickel foam in the autoclave, and keep it warm at 100°C for 24 hours.

[0040] 5. After the autoclave is naturally cooled to room temperature, take out the nickel foam, ultrasonically in deionized water and ethanol for 0.5 hours, and then dry at 80°C for 12 hours to obtain nickel foam self-supporting Ni(OH) 2 .

[0041] 6. Weigh 1.0g of sodium hypophosphite as the phosphorus source and add the above nickel foam self-supporting Ni(OH) 2 middle ， In an argo...

Embodiment 2

[0047] 1. Sonicate 2*4cm nickel foam in 2mol / L sodium hydroxide aqueous solution, absolute ethanol and deionized water for 1 hour.

[0048] 2. Weigh 10.52g of nickel sulfate and dissolve it in 20mL of deionized water to prepare a salt solution with a concentration of 2mol / L.

[0049] 3. Add 1.0 g of PEG to the above salt solution and stir at 80° C. for 1 hour to obtain a mixed solution.

[0050] 4. Put the above mixed solution in an autoclave, and put the treated nickel foam into the autoclave, and keep it warm at 200°C for 5 hours.

[0051] 5. After the autoclave is naturally cooled to room temperature, take out the nickel foam, ultrasonically in deionized water and ethanol for 1 hour, and dry at 120°C for 4 hours to obtain the nickel foam self-supporting Ni(OH) 2 .

[0052] 6. Weigh 2.0g of sodium hypophosphite as the phosphorus source and add the above nickel foam self-supporting Ni(OH) 2 In the argon atmosphere, the temperature was raised to 600°C at a rate of 5°C / min a...

Embodiment 3

[0056] 1. Sonicate 2*4cm nickel foam in 1.2mol / L sodium hydroxide aqueous solution, absolute ethanol and deionized water for 0.7 hours.

[0057] 2. Weigh 6.23g of nickel acetate and dissolve it in 20mL of deionized water to prepare a salt solution with a concentration of 1.25mol / L.

[0058] 3. Add 3.0 g of sodium dodecyl hydroxysulfonate to the above salt solution, and stir at 65° C. for 1.3 hours to obtain a mixed solution.

[0059] 4. Put the above mixed solution in an autoclave, and put the treated nickel foam into the autoclave, and keep it warm at 150°C for 14.5 hours.

[0060] 5. After the autoclave is naturally cooled to room temperature, take out the nickel foam, sonicate in deionized water and ethanol for 0.7 hours, and dry at 100°C for 8 hours to obtain nickel foam self-supporting Ni(OH) 2 .

[0061] 6. Weigh 3.0g of sodium hypophosphite as the phosphorus source and add the above nickel foam self-supporting Ni(OH) 2 In the argon atmosphere, the temperature was rai...

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Abstract

The invention discloses a foamed nickel self-supported flake-shaped Ni3P / C composite material for a sodium ion battery negative electrode and a preparation method for the composite material. According to the composite material, the flake-shaped Ni3P is uniformly growing on the foamed nickel; and the Ni3P is uniformly coated with a C film. The preparation method for the composite material comprises the steps of taking a nickel compound as the raw material, and uniformly growing a flake-shaped nickel hydroxide layer on the surface of the nickel compound through a hydrothermal method; then taking sodium hypophosphite as a phosphorus source, and performing thermal insulation at a temperature of 300 DEG C for 2h to prepare the foamed nickel self-supported flake-shaped Ni3P material; and finally, performing carbon coating on the foamed nickel self-supported flake-shaped Ni3P material to obtain the foamed nickel self-supported flake-shaped Ni3P / C composite material. The sodium ion battery prepared from the Ni3P / C composite material prepared by the invention has excellent specific capacity, rate capability and stable cycling performance; and in addition, the preparation method is simple and feasible, wide in raw material resources and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of preparation and application of energy materials, in particular to a nickel foam self-supporting sheet Ni for the negative electrode of a sodium ion battery 3 P / C composite material and its preparation method. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebooks, mobile power supplies, electric vehicles and hybrid vehicles due to their high energy density and long cycle life. However, the reserves of lithium resources are limited. With the large-scale application of lithium-ion batteries, the shortage of lithium resources and the soaring price will seriously hinder the further development of lithium-ion batteries. Since sodium and lithium belong to the same main group elements, they have similar physical and chemical properties, and sodium-ion batteries have attracted increasing interest in recent years. And compared to lithium resources, sodium resources have a large sto...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M2004/027Y02E60/10
Inventor 杨成浩郑锋华熊训辉刘美林
Owner SOUTH CHINA UNIV OF TECH
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