Trimanganese tetroxide/carbon composite with rodlike core-shell structure as well as preparation method and application of trimanganese tetroxide/carbon composite

A technology of trimanganese tetraoxide and carbon composite materials, which is applied in the direction of structural parts, electrochemical generators, active material electrodes, etc., can solve the problems of limited application of trimanganese tetraoxide, poor cycle stability, and microstructure collapse, and achieve Effects of shortening migration distance, improving stability, and enhancing electrical conductivity

Inactive Publication Date: 2017-11-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to poor cycle stability and fast decay, the application of trimanganese tetroxide is severely limited, mainly because the volume of the electrode material changes greatly due to the intercalation and deintercalation of sodium ions during the charging and discharging process, thus making the microscopic structural collapse

Method used

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  • Trimanganese tetroxide/carbon composite with rodlike core-shell structure as well as preparation method and application of trimanganese tetroxide/carbon composite
  • Trimanganese tetroxide/carbon composite with rodlike core-shell structure as well as preparation method and application of trimanganese tetroxide/carbon composite
  • Trimanganese tetroxide/carbon composite with rodlike core-shell structure as well as preparation method and application of trimanganese tetroxide/carbon composite

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing a manganese tetraoxide / carbon composite material with a rod-shaped core-shell structure for a negative electrode of a sodium ion battery, the specific steps are as follows:

[0038] (1) Dissolve 0.6040g of manganese sulfate and 0.9120g of ammonium persulfate in 40mL of deionized water, stir well to obtain solution R 1 , R 2 ;

[0039] (2) the two solutions R described in the above step (1) 1 , R 2 Mix and stir well to obtain a mixed solution R 3 ;

[0040] (3) the mixed solution R obtained in the above step (2) 3 Transfer to a hydrothermal reaction kettle with polytetrafluoroethylene lining, and keep the reaction at 140°C for 10h;

[0041] (4) naturally cool the reaction kettle of the above step (3) to room temperature to obtain black precipitated manganese dioxide; wash with deionized water and absolute ethanol several times and then dry in an oven at 70° C. overnight to obtain rod-shaped manganese dioxide;

[0042] (5) ultrasonically disp...

Embodiment 2

[0049] A method for preparing a manganese tetraoxide / carbon composite material with a rod-shaped core-shell structure for a negative electrode of a sodium ion battery, the specific steps are as follows:

[0050] (1) Dissolve 0.6795g of manganese carbonate and 1.0620g of ammonium persulfate in 40mL of deionized water respectively, and stir evenly to obtain solution R 1 , R 2 ;

[0051] (2) the two solutions R described in the above step (1) 1 , R 2 Mix and stir well to obtain a mixed solution R 3 ;

[0052] (3) the mixed solution R obtained in the above step (2) 3 Transfer to a hydrothermal reaction kettle with polytetrafluoroethylene lining, and keep the reaction at 130°C for 11h;

[0053] (4) naturally cool the reaction kettle of the above step (3) to room temperature to obtain black precipitated manganese dioxide; wash with deionized water and absolute ethanol several times and then dry in an oven at 70° C. overnight to obtain rod-shaped manganese dioxide;

[0054] (5...

Embodiment 3

[0061] A method for preparing a manganese tetraoxide / carbon composite material with a rod-shaped core-shell structure for the negative electrode material of a sodium ion battery, the specific steps are as follows:

[0062] (1) Dissolve 0.6795g of manganese carbonate and 1.0620g of ammonium persulfate in 40mL of deionized water respectively, and stir evenly to obtain solution R 1 , R 2 ;

[0063] (2) the two solutions R described in the above step (1) 1 , R 2 Mix and stir well to obtain a mixed solution R 3 ;

[0064] (3) the mixed solution R obtained in the above step (2) 3 Transfer to a hydrothermal reaction kettle with polytetrafluoroethylene lining, and keep the reaction at 150°C for 12h;

[0065] (4) naturally cool the reaction kettle of the above step (3) to room temperature to obtain black precipitated manganese dioxide; wash with deionized water and absolute ethanol several times and then dry in an oven at 70° C. overnight to obtain rod-shaped manganese dioxide; ...

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Abstract

The invention relates to a trimanganese tetroxide / carbon composite with a rodlike core-shell structure. The composite is of a one-dimensional rodlike structure formed by coating rodlike trimanganese tetroxide with partially graphitized amorphous carbon, the length is 300-800 nm, and the diameter of a cross section is 40-90 nm. The prepared trimanganese tetroxide / carbon composite is uniform in size, the core-shell structure is obtained by coating rodlike trimanganese tetroxide with partially graphitized amorphous carbon, so that migration distances of ions and electrons are shortened when the composite is applied to a sodium-ion battery electrode material, the problem of volume expansion of the electrode material due to embedment and separation-out of sodium ions is effectively solved, and conductivity of trimanganese tetroxide is enhanced by means of carbon addition. The composite as an anode material shows stable cycling performance and good rate capability in a sodium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrode materials, and in particular relates to a rod-shaped core-shell structure manganese manganese tetraoxide / carbon composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of electric vehicles and large-scale smart grids, lithium resource reserves will not be able to meet the huge demand for lithium-ion batteries. Therefore, it is urgent to develop a next-generation battery system with excellent comprehensive performance. And sodium, which is in the same family as lithium, has similar physical and chemical properties to lithium, and sodium resources are large, cheap, widely distributed, and easy to obtain. It is very suitable for power grids and other large-scale energy storage applications, and may become the first choice for lithium-ion batteries. One of the alternatives. Due to the similar chemical properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/583H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/054
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/362H01M4/50H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 李昱董文达王佩琪
Owner WUHAN UNIV OF TECH
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