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Method for preparing polymer clad nickel aluminum alloy/sulfur composite electrode material

A nickel-aluminum alloy and composite electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as powder removal, and achieve the effects of industrial production, simple process, and convenient operation

Inactive Publication Date: 2015-01-28
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is undeniable that the carbon material with novel structure and small pore size effectively limits the particle size of elemental sulfur. At the same time, the good conductivity of carbon material also improves the conductivity of elemental sulfur. There is no coating on the surface of the sulfur cathode composite material, and powder removal will inevitably occur during the charge-discharge cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a polymer-coated nickel-aluminum alloy / sulfur composite electrode material, the composition of which is designed as follows:

[0023] System 1: Alkali-treated NiAl 3 Alloy 2g, elemental sulfur 3g, polyaniline 0.2g, catalyst ferric chloride 0.2g;

[0024] System 2: Alkali-treated NiAl 2 Alloy 2g, elemental sulfur 3g, polyaniline 0.2g, catalyst ferric chloride 0.2g;

[0025] The steps are as follows: 1) Select nickel-aluminum alloy nanopowder with a size between 10-500nm and treat it in 100C alkaline aqueous solution for 20 hours; 2), weigh the hollow nickel-aluminum alloy nanopowder and elemental sulfur in step (1), and mix them in a certain proportion , then heated at 500°C under argon atmosphere protection for 10h; 3), crushed the product of step (2), milled, mixed with a certain proportion of polyaniline precursor and alcohol aqueous solution, and then ultrasonically dispersed for 10h; 4), The catalyst ferric chloride is added to the product ...

Embodiment 2

[0028] A method for preparing a polymer-coated nickel-aluminum alloy / sulfur composite electrode material, the composition of which is designed as follows:

[0029] System 3: Alkali-treated NiAl 3 Alloy 2g, elemental sulfur 4g, polyaniline 0.3g, catalyst ferric chloride 0.3g;

[0030] System 4: Alkali-treated NiAl 3 Alloy 2g, elemental sulfur 2g, polyaniline 0.2g, catalyst ferric chloride 0.1g;

[0031] The steps are as follows: 1) Select nickel-aluminum alloy nanopowder with a size between 10-500nm and treat it in an alkaline aqueous solution at 120°C for 30 hours; 2), weigh the hollow nickel-aluminum alloy nanopowder and elemental sulfur in step (1), and weigh them in a certain proportion Mix, then heat at 600°C under argon atmosphere protection for 10h; 3), crush the product of step (2), grind, mix with a certain proportion of polyaniline precursor and alcohol aqueous solution, and then ultrasonically disperse for 10h; 4) 1. Add the catalyst ferric chloride to the product...

Embodiment 3

[0034] Operate with embodiment 1,

[0035] System 5: Alkali-treated NiAl 2 Alloy 2g, elemental sulfur 1g, polyaniline 0.2g, catalyst ferric chloride 0.2g;

[0036] System 6: Alkali-treated NiAl 2 Alloy 2g, elemental sulfur 2g, polyaniline 0.2g, catalyst ferric chloride 0.2g;

[0037] System 7: Alkali-treated NiAl 2 Alloy 2g, elemental sulfur 4g, polyaniline 0.2g, catalyst ferric chloride 0.2g;

[0038] The sulfur electrodes of systems 5, 6 and 7 have good charge-discharge performance, and the initial specific capacities are 516, 784 and 902mAh / g; after 100 cycles, the capacity retention rate is greater than 74%.

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Abstract

The invention relates to a method for preparing a polymer clad nickel aluminum alloy / sulfur composite electrode material. The method is characterized by comprising the steps of: by taking hollow nickel aluminum alloy nanometer powder as a carrier for the polymer clad nickel aluminum alloy / sulfur composite electrode material, carrying out heating sublimation, diffusion, and condensation on sulfur to obtain a nickel aluminum alloy / sulfur composite material; ultrasonically dispersing the nickel aluminum alloy / sulfur composite material and a polymeric precursor in an alcohol-water blend, then adding a catalyst, and carrying out polymerization, stirring, deposition, filtering, collecting, and drying to obtain the polymer clad nickel aluminum alloy / sulfur composite electrode material, wherein the nickel aluminum alloy is one of NiAl3 and NiAl2, sulfur accounts for 30-70% of the total mass of the polymer clad nickel aluminum alloy / sulfur composite electrode material, and a polymer accounts for 0.5-10% of the total mass of the polymer clad nickel aluminum alloy / sulfur composite electrode material. When used as the positive electrode for a lithium sulfur battery, the composite material has a good specific capacity and excellent cycling performance, wherein the first discharge capacity is greater than 500mAh / g, and the discharge specific capacity retention rate is greater than 74% after 100 cycles.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a preparation method of a polymer-coated nickel-tin alloy / sulfur composite electrode material. Background technique [0002] Lithium-sulfur batteries are a new generation of green high-energy batteries that have developed rapidly in recent years. They have the advantages of low price, high specific energy, and low environmental pollution. They are the first choice for secondary energy in the future. The key bottleneck of lithium-sulfur batteries is the development of high-performance sulfur cathode materials. The theoretical discharge mass specific capacity of sulfur cathodes is 1675mAh / g, which is several times the specific capacity of lithium-ion cathode materials. At the same time, sulfur reserves are abundant, cheap and environmentally friendly. Good. But the actual specific capacity that can be realized at present is far lower than the theoretical speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1399H01M4/1395
CPCH01M4/1395H01M4/1399H01M4/525Y02E60/10
Inventor 范美强陈达柴文详田光磊位攀
Owner CHINA JILIANG UNIV
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