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Pyrite-based composite material as well as preparation method and application thereof

A technology of composite materials and pyrite, which is applied in the field of pyrite-based composite materials and its preparation, can solve the problems of poor cycle stability and rate performance, low battery durability and cycle performance, and poor electrochemical performance. High specific capacity, long cycle life and good stability

Active Publication Date: 2021-06-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Natural pyrite has the characteristics of high specific capacity, large resource reserves, and low preparation cost, and can be applied to the field of batteries. Pyrite materials have been reported in the field of sodium-ion batteries, but their electrochemical performance is poor, such as cycle stability Poor performance and rate performance, and low discharge specific capacity, the reason may be that the pyrite material is easy to react with the electrolyte and decompose, resulting in low durability and poor cycle performance of the battery

Method used

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  • Pyrite-based composite material as well as preparation method and application thereof
  • Pyrite-based composite material as well as preparation method and application thereof
  • Pyrite-based composite material as well as preparation method and application thereof

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preparation example Construction

[0036] According to the present invention, the preparation method of the pyrite-based composite material comprises the following steps:

[0037] Step 1. Prepare pyrite powder.

[0038] According to the present invention, in step 1, the particle size of the obtained pyrite powder is 1-10 μm, preferably 1-5 μm, for example 2 μm.

[0039] According to the present invention, in step 1, pyrite powder can obtain through the following steps:

[0040] Step 1.1, grinding the pyrite;

[0041] Step 1.2, solid-liquid separation to obtain pyrite powder.

[0042] According to the present invention, in step 1.1, the pyrite is natural pyrite, and the natural pyrite is preferably taken from Shaoguan, Guangdong, and is preferably flotation pyrite in a concentrator, with a particle size of several hundred microns to several millimeters.

[0043] According to the present invention, in step 1.1, the pyrite is added to the solvent before grinding to form a suspension with a pyrite mass percentag...

Embodiment 1

[0088] Grinding the pyrite with a planetary ball mill to obtain a pyrite suspension, centrifuging and drying the pyrite suspension to obtain pyrite powder;

[0089] Add 5g of pyrite powder to 100ml of xanthate solution with a concentration of 2%, soak for 30min, stir, and then centrifuge at 12000rpm for 15min to obtain modified pyrite powder;

[0090] Add 4g of pyrite powder and 30g of phenolic resin into ethanol, stir and mix, then add them to a sand bath for heating and stirring, the heating temperature is 200°C, and the heating time is 10h. After the ethanol volatilizes, pyrite and A mixture of phenolic resins evenly mixed;

[0091] The mixture was placed in a high-temperature furnace, and subjected to high-temperature roasting in an argon atmosphere at a roasting temperature of 700° C. and a roasting time of 2 hours. After the roasting was completed, a pyrite-based composite material was obtained.

Embodiment 2

[0093] 10g of pyrite powder was added to 100ml of xanthate solution with a concentration of 0.2%, soaked for 60min, accompanied by stirring, and then centrifuged at a speed of 15000rpm for 10min to obtain modified pyrite powder;

[0094] Add 2g of pyrite powder and 30g of phenolic resin into ethanol, stir and mix, then add them to a sand bath for heating and stirring, the heating temperature is 100°C, and the heating time is 24h. After the ethanol volatilizes, pyrite and A mixture of phenolic resins evenly mixed;

[0095] The mixture was placed in a high-temperature furnace, and subjected to high-temperature roasting in an argon atmosphere at a roasting temperature of 600° C. and a roasting time of 3 hours. After the roasting was completed, a pyrite-based composite material was obtained.

[0096] The pyrite powder prepared in embodiment 1 and the obtained pyrite-based composite material of embodiment 1 and 2 are carried out XRD test (using Bruker D8 X-ray diffractometer), the ob...

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Abstract

The invention discloses a pyrite-based composite material. The XRD spectrogram of the composite material has diffraction peaks when 2 theta is 30.02 degrees, 34.00 degrees, 44.03 degrees and 53.31 degrees; preferably, the composite material is prepared from pyrite and a carbon source: pyrite powder is soaked in a xanthate solution, the obtained modified pyrite powder and the carbon source are mixed and roasted, so the carbon-coated pyrite powder is prepared, namely the pyrite-based composite material. As a high-performance battery material, the pyrite-based composite material has the advantages of high specific capacity, high magnification, no volume effect, good stability and long cycle life; a process route from ore to battery material is provided, and the breakthrough of preparing the high-performance battery material from the pyrite is realized. According to the preparation method, the natural pyrite with high specific capacity, large resource reserve and low preparation cost is taken as the raw material, so the production cost is greatly reduced, the preparation procedures are reduced, the yield is high, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of battery electrodes, and in particular relates to a pyrite-based composite material and a preparation method and application thereof. Background technique [0002] Natural pyrite has the characteristics of high specific capacity, large resource reserves, and low preparation cost, and can be applied to the field of batteries. Pyrite materials have been reported in the field of sodium-ion batteries, but their electrochemical performance is poor, such as cycle stability Poor performance and rate performance, and low discharge specific capacity, the reason may be that the pyrite material is easy to react with the electrolyte and decompose, resulting in low durability and poor cycle performance of the battery. [0003] Therefore, it is of great significance to develop a pyrite-based composite material with high specific capacity, high rate, good stability and long cycle life as a high-performance battery material. Cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 孙伟江锋常兴华张丽敏赵文青周嘉辉葛鹏
Owner CENT SOUTH UNIV
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