Rodlike manganese dioxide/polyaniline composite material as well as preparation method and application of rodlike manganese dioxide

A manganese dioxide and composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of prone to volume expansion and poor electrical conductivity, and achieve the effects of increasing utilization, improving electrical conductivity, and good electrical conductivity.

Inactive Publication Date: 2017-05-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MnO 2 Most of the crystal forms of contain vacancies capable of accommodating sodium ions, among which, β-MnO 2 It is the most thermodynamically stable crystal form and has the most common rutile structure of oxides, but MnO 2 As an electrode material for sodium-ion secondary batteries, it has the disadvantages of poor conductivity and prone to volume expansion during charging and discharging.

Method used

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  • Rodlike manganese dioxide/polyaniline composite material as well as preparation method and application of rodlike manganese dioxide
  • Rodlike manganese dioxide/polyaniline composite material as well as preparation method and application of rodlike manganese dioxide
  • Rodlike manganese dioxide/polyaniline composite material as well as preparation method and application of rodlike manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of rod-shaped manganese dioxide / polyaniline composite material, its preparation method comprises the steps:

[0048] 1) Add 0.004mol (NH 4 ) 2 S 2 o 8 and 0.004mol MnSO 4 ·H 2 O was dissolved in 40mL deionized water respectively, and stirred on a magnetic stirrer for 15min to obtain ammonium persulfate solution and manganese sulfate solution, and the two were mixed uniformly to obtain mixed solution I;

[0049] 2) Add 0.4 g of cationic surfactant CTAB to the obtained mixed solution I, and stir for 15 minutes to obtain a uniform mixed solution II;

[0050] 3) Transfer the obtained mixed liquid II to a 100mL hydrothermal synthesis reaction kettle, place the hydrothermal synthesis reaction kettle in a heater, heat it to 140°C under an air atmosphere and keep it warm for 12 hours, and take out the obtained solution after the heat preservation reaction Placed at room temperature and naturally cooled to room temperature, a black flocculent precipitate (MnO 2 ); ...

Embodiment 2

[0059] A kind of rod-shaped manganese dioxide / polyaniline composite material, its preparation method comprises the steps:

[0060] 1) Add 0.0045mol (NH 4 ) 2 S 2 o 8 and 0.005mol MnSO 4 ·H 2 O was dissolved in 50mL deionized water respectively, and stirred on a magnetic stirrer for 15min to obtain ammonium persulfate solution and manganese sulfate solution, and the two were mixed uniformly (continue to stir for 25min) to obtain mixed solution I;

[0061] 2) Add 0.5 g of cationic surfactant CTAB to the obtained mixed solution I, and stir for 20 minutes to obtain a uniform mixed solution II;

[0062] 3) Transfer the obtained mixed solution II to a 150mL hydrothermal synthesis reaction kettle, place the hydrothermal synthesis reaction kettle in a heater, heat it to 140°C under an air atmosphere and keep it warm for 14 hours, and take out the obtained solution after the heat preservation reaction Placed at room temperature and naturally cooled to room temperature, a black fl...

Embodiment 3

[0070] A kind of rod-shaped manganese dioxide / polyaniline composite material, its preparation method comprises the steps:

[0071] 1) Add 0.009mol (NH 4 ) 2 S 2 o 8 and 0.008molMnCl 2 ·H 2 O was dissolved in 100mL deionized water respectively, and stirred on a magnetic stirrer for 15 minutes to obtain ammonium persulfate solution and manganese chloride solution, and the two were mixed uniformly (continue to stir for 20 minutes) to obtain mixed solution I;

[0072] 2) Add 2 g of cationic surfactant CTAB to the obtained mixed solution I, and stir for 25 minutes to obtain a uniform mixed solution II;

[0073] 3) Transfer the obtained mixed solution II to a 250mL hydrothermal synthesis reaction kettle, place the hydrothermal synthesis reaction kettle in a heater, heat it to 140°C under an air atmosphere and keep it warm for 15 hours. After the heat preservation reaction, take out the obtained solution Placed at room temperature and naturally cooled to room temperature, a bla...

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Abstract

The invention discloses a rodlike manganese dioxide / polyaniline composite material and a preparation method thereof. The rodlike manganese dioxide / polyaniline composite material is of a one-dimensional rodlike structure, the size is 300-700nm, the mean diameter is 40-70nm, and the one-dimensional nanostructure has a relatively short ion transport distance in radial direction when the rodlike manganese dioxide / polyaniline composite material is used as an electrode material, so that the energy storage process can be accelerated, the influence caused by volume expansion in charging and discharging processes can be reduced by conductive polymer polyaniline coating the surface of the rodlike structure, the rodlike manganese dioxide / polyaniline composite material plays a role in stabilizing the MnO2 crystal structure, the utilization rate of MnO2 can be increased, and the dissolution of MnO2 is prevented, especially, the dissolution of MnO2 in an acidic electrolyte is prevented, the obtained composite material has relatively high conductivity; and the cycling stability and the rate capability of a battery can be greatly improved. The preparation method is simple, safe, environmentally friendly and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of sodium ion secondary batteries, and in particular relates to a rod-shaped manganese dioxide / polyaniline composite material and its preparation method and application. Background technique [0002] At present, the main power storage devices on the market generally use lithium-ion secondary batteries. Although lithium-ion batteries have excellent electrochemical performance, due to their shortcomings such as high cost, low safety, and relative scarcity of resources, in a certain To a certain extent, the further rapid development of lithium-ion batteries has been prevented, so the research on next-generation secondary batteries with low cost, high safety and high energy density higher than lithium-ion secondary batteries has attracted widespread attention of researchers. Among them, the sodium-ion secondary battery stands out because of its extensive resources, low price, environmental friendliness, safety a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/505
CPCH01M4/1391H01M4/505Y02E60/10
Inventor 李昱王佩琪刘婧黄华文苏宝连
Owner WUHAN UNIV OF TECH
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