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A kind of polycrystalline manganese dioxide/carbon nanotube composite material and its preparation method and application

A technology of multi-walled carbon nanotubes and carbon nanotubes, which is applied in the field of polycrystalline MnO2/carbon nanotube composite materials and their preparation, can solve the problems of structural expansion, poor electrical conductivity, and inhibit the practical application value of sodium-ion batteries, and can achieve production The effect of short cycle, low energy consumption and novel design ideas

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its poor electrical conductivity and extensive repetition of the sodium cycling process lead to structural expansion, inhibiting the potential practical application of sodium-ion batteries.

Method used

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  • A kind of polycrystalline manganese dioxide/carbon nanotube composite material and its preparation method and application
  • A kind of polycrystalline manganese dioxide/carbon nanotube composite material and its preparation method and application
  • A kind of polycrystalline manganese dioxide/carbon nanotube composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polycrystalline MnO 2 / The preparation method of carbon nanotube composite material, comprises the following steps:

[0027] 1) Take 0.2g carboxylated multi-walled carbon nanotubes (AF-MWCNTs), 2.1g potassium permanganate (KMnO 4 ), placed in a mortar, fully ground evenly to obtain a mixture;

[0028] 2) In an air atmosphere, the mixture was raised from room temperature to 290 °C at a heating rate of 10 °C / min, kept for 2 hours, and cooled to room temperature;

[0029] 3) Rinse the product treated in step 2) with distilled water for 3 to 5 times, then with ethanol for 3 to 5 times, and dry at 85°C for 14 hours in a vacuum environment to obtain polycrystalline MnO 2 / carbon nanotube composites.

Embodiment 2

[0031] A polycrystalline MnO 2 / The preparation method of carbon nanotube composite material, comprises the following steps:

[0032] 1) Take 0.3g carboxylated multi-walled carbon nanotubes (AF-MWCNTs), 2.6g potassium permanganate (KMnO 4 ), placed in a mortar, fully ground evenly to obtain a mixture;

[0033] 2) In an air atmosphere, the mixture was raised from room temperature to 300 °C at a heating rate of 5 °C / min, kept for 2 hours, and cooled to room temperature;

[0034] 3) Rinse the product treated in step 2) with distilled water for 3 to 5 times, then with ethanol for 3 to 5 times, and dry at 70°C for 12 hours in a vacuum environment to obtain polycrystalline MnO 2 / carbon nanotube composites.

Embodiment 3

[0036] A polycrystalline MnO 2 / The preparation method of carbon nanotube composite material, comprises the following steps:

[0037] 1) Take 0.5g carboxylated multi-walled carbon nanotubes (AF-MWCNTs), 3.2g potassium permanganate (KMnO 4 ), placed in a mortar, fully ground evenly to obtain a mixture;

[0038] 2) In an air atmosphere, the mixture was raised from room temperature to 310 °C at a heating rate of 15 °C / min, kept for 2 hours, and cooled to room temperature;

[0039] 3) Rinse the product treated in step 2) with distilled water for 3 to 5 times, then with ethanol for 3 to 5 times, and dry at 50°C for 16 hours in a vacuum environment to obtain polycrystalline MnO 2 / carbon nanotube composites.

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Abstract

The invention discloses a polycrystalline manganese dioxide / carbon nanotube composite material as well as a preparation method and application thereof and belongs to the technical field of preparationof catalytic materials of sodium-ion battery positive electrodes. According to the technical scheme, a solid-phase synthesis method is utilized and MnO2 grows on a carbon nanotube framework in situ to generate the polycrystalline MnO2 / carbon nanotube composite material; the method is green and environmentally friendly. The prepared MnO2 / carbon nanotube composite material is a polycrystalline material and has the advantages of high purity, short period, greenness and environment protection, low energy consumption and economical efficiency, and large-scale production is facilitated. The polycrystalline MnO2 / carbon nanotube composite material prepared by the method is applied to the sodium-ion battery positive electrodes, has good circulating stability, long discharging time and high discharge specific energy, and can be widely used as a sodium-ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for sodium ion batteries, and in particular relates to a polycrystalline MnO 2 / Carbon nanotube composite material and its preparation method and application. Background technique [0002] With the continuous development of human society, finding new energy storage devices to replace fossil energy has become a research hotspot in the field of new energy. [Liu D,Garcia B B,Zhang Q,et al.Mesoporous Hydrous ManganeseDioxide Nanowall Arrays with Large Lithium Ion Energy Storage Capacities[J].Advanced Functional Materials,2010,19(7):1015-1023.] Rich resources, low cost, small size, light weight, no memory effect, no pollution, etc., suitable for large-scale energy storage and other advantages have developed rapidly in recent years. [Pan Du, Qi Xingguo, Liu Lilu, Jiang Liwei, Lu Yaxiang, Bai Ying, Hu Yongsheng, Chen Liquan. New progress in the research of positive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/054
CPCH01M4/364H01M4/502H01M4/625H01M10/054Y02E60/10
Inventor 许占位李康张艺华杨军孔硌黄剑锋曹丽云王瑞谊
Owner SHAANXI UNIV OF SCI & TECH
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