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Preparation method of graphene and ferrous disulfide composite positive electrode material

A composite positive electrode material, iron disulfide technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of poor high-current discharge characteristics, polluted electrolyte, and reduced effectiveness, and achieve good charge and discharge performance and use Effects of lifetime, improved conductivity and ion mobility, and high energy density

Inactive Publication Date: 2013-09-25
SHENGZHOU ELECTRIC POWER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium-iron disulfide battery positive electrode materials are generally directly obtained from natural pyrite after impurity removal and crushing. The obtained iron disulfide material has low conductivity and relatively low effective specific surface area, and the resulting battery has low discharge efficiency. High, high current discharge characteristics are not good
Due to undesirable oxidation / reduction reactions between the electrolyte and the electrode material (discharged or not), the electrolyte may gradually be contaminated and reduce its effectiveness or cause excessive gassing
This in turn can lead to catastrophic battery damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] By using the improved Hummer method, graphite is oxidized into graphite oxide in an ice-water bath with concentrated sulfuric acid and potassium permanganate, and graphite oxide is ultrasonically exfoliated into graphene oxide to obtain a uniformly dispersed graphene oxide colloidal solution. Graphene oxide is reduced to graphene with a reducing agent.

[0018] Etching the product obtained from the reduction, the etchant is an aqueous solution of 25% hydrofluoric acid by mass percent, and the etching time is 5-8 hours. After the etching is completed, the product is alternately washed three times in water and ethanol , drying to obtain a graphene powder, and dispersing the graphene powder in acetone to obtain a graphene dispersion, the graphene concentration of the dispersion is 10g / l.

[0019] FeSO 4 Stirring is dissolved in the mixed solution of acetone and water and makes solution one, (NH 2 ) 2 CS and PVP are stirred and dissolved in a mixed solution of acetone an...

Embodiment 2

[0023] By using the improved Hummer method, graphite is oxidized into graphite oxide with concentrated sulfuric acid and potassium permanganate in an ice-water bath, and graphite oxide is ultrasonically exfoliated into graphene oxide to obtain a uniformly dispersed graphene oxide colloidal solution, which is placed in a water bath at 90 °C Graphene oxide is reduced to graphene with a reducing agent.

[0024] Etching the product obtained by reduction, the etchant is an aqueous solution of 30% hydrofluoric acid by mass percentage, and the etching time is 5h. After the etching is completed, the product is repeatedly washed with water and ethanol for 5 times, and dried The graphene powder is obtained, and the graphene powder is dispersed in acetone to obtain a graphene dispersion liquid, and the graphene concentration of the dispersion liquid is 15 g / l.

[0025] FeSO 4 Stirring is dissolved in the mixed solution of acetone and water and makes solution one, (NH 2 ) 2 CS and PVP ...

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Abstract

The invention relates to a preparation method of a graphene and ferrous disulfide composite positive electrode material. The method comprises the following steps of: (1) ultrasonically peeling graphite oxide to oxidized graphene to obtain an oxidized graphene colloid liquor, and reducing the oxidized graphene to graphene by a reducing agent; etching and washing to obtain graphene powder, and dispersing the graphene powder in acetone to obtain a graphene dispersion liquid; (2) preparing high purity ferrous disulfide nanocrystals by FeSO4, (NH2)2CS and PVP (Polyvinyl Pyrrolidone); (3) adding the ferrous disulfide nanocrystals into the graphene dispersion liquid, and mechanically stirring and mixing paste, heating, cooling and ball-milling and sieving the obtained mixed paste to obtain the graphene and ferrous disulfide composite positive electrode material. According to the composite positive electrode material prepared by the invention, high purity ferrous disulfide is prepared by a wet method to ensure the high energy density of ferrous disulfide. The material is covered by high purity graphene, so that the electric conductivity and ionic mobility of the material are improved.

Description

Technical field [0001] The invention relates to a preparation method of a graphene-iron disulfide composite positive electrode material. Background technique [0002] Since the 1990s, Sony Corporation used flake graphite instead of metal Li with extremely poor safety to successfully prepare the first rechargeable lithium-ion secondary battery. Lithium-ion batteries are widely used due to their high specific energy and no pollution. The scope has been developed rapidly, and has expanded from mobile communication power supplies, notebook computers, cameras, etc. to electric tools, electric vehicles and other fields. [0003] The lithium-iron disulfide battery is a lithium battery composed of iron disulfide as the positive electrode material, metal lithium as the negative electrode material, and an organic electrolyte. The lithium-iron disulfide primary battery is a room temperature discharge battery with a rated voltage of 1.5 V, which matches the current general electrical a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58
CPCY02E60/10
Inventor 冯林杰
Owner SHENGZHOU ELECTRIC POWER
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