Porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube and preparation method and application thereof

A technology of nitrogen-doped carbon and manganese dioxide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle performance, capacity loss, and low Coulombic efficiency, and achieve improved Stability, improvement of rate performance, effect of alleviating volume change

Active Publication Date: 2021-12-21
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite materials are often used as negative electrode materials because of their high mechanical strength and good chemical stability, but the active sites inside the body may react with lithium ions, causing irreversible capacity loss during the cycle and resulting in poor cycle performance.
Metal oxide materials have high reversible capacity and energy density, but they also have the problem of low Coulombic efficiency during cycling.

Method used

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  • Porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube and preparation method and application thereof
  • Porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube and preparation method and application thereof
  • Porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of porous nitrogen doped carbon coaxial coated manganese dioxide nanotube (MNO 2 @PNC) Negative electrode material, including the steps of: Step S1, 4.0 mmol of MNSO 4 · H 2 O, 7.0mmol KCLO 3 And 7.0mmol of CH 3 Cook dissolved in 70 ml of deionized water and continuously stirred and dispersed evenly;

[0033] Step S2, add CH to the solution obtained from S1 3 COOH adjusts pH to 3;

[0034] Step S3, the transfer to the transition from S2 in the autoclave is maintained at 200 ° C for approximately 24 h, and after filtration in a vacuum environment, the precipitate is collected, and the product is centrifuged with deionized water. Finally, at 70 ° C for 12 h;

[0035] Step 4, adding the product obtained by adding S3 to 70 ml 0.1 mol / l HCl to stir for 1 h and then dropped with 150 μl of pyrrole monomer. After stirring for 6 h, the color of the suspension was completely changed from brown to black, and after filtered in a vacuum environment The ion water washing bl...

Embodiment 2

[0044] Example 2 and Example 1 The difference is only that the sintering temperature in step S6 is 500 ° C, and the holding time is 5 h.

[0045] SEM, TEM, and HRTEM test and assembled battery made of Example 2 were electrochemically conductive, and the test results showed that the product MNO was prepared. 2 @PNC morphology size one; MnO obtained in this example 2 The negative electrode material of @PNC is assembled, and the lithium sheet is a positive electrode, and the buckle battery is tested. Constant current charge and discharge test shows that MNO 2 @PNC negative material assembled electrodes at 5A g -1 At current densities, the first discharge ratio is 408mAh g -1 . In 5AG -1 After the current density is 100 times, the specific capacity remains stable, which is basically consistent with Example 1, indicating the MnO 2 The cycle performance of @PNC's negative electrode is excellent.

Embodiment 3

[0047] Example 3 The difference from Example 1 is only: adding CH 3 COOH adjusts pH to 2.5, add CH 3 The amount of COOK was 7.5 mmol; the rest were basically the same as in Example 1.

[0048] The electrochemical performance tests made by SEM, TEM, and HRTEM testing and assembled cells made of Example 3 were carried out. The test results showed that the product MNO was prepared. 2 @PNC morphology size one; MnO obtained in this example 2 The negative electrode material of @PNC is assembled, and the lithium sheet is a positive electrode, and the buckle battery is tested. Constant current charge and discharge test shows that MNO 2 @PNC negative material assembled electrodes at 5A g -1 At current densities, the first discharge ratio is 407mA h g -1 . At 5A G -1 After 100 in current density, the specific capacity remains stable, which is substantially consistent with Example 1, indicating porous nitrogen doped carbon coaxial coated manganese dioxide nanotube (MNO) 2 The cycle performan...

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Abstract

The invention discloses a porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a manganese salt, an oxidizing agent and CH3COOR in deionized water, adjusting the pH value through CH3COOH to obtain a solution, and preparing a product through a hydrothermal method to obtain MnO2 nanowires; s2, mixing the MnO2 nanowire, diluted hydrochloric acid and an organic monomer, and collecting a precipitate to obtain MnO2 coaxially coated with a high polymer; s3, sintering the product in a nitrogen atmosphere to obtain a nitrogen-doped carbon coaxial coated MnO2 nanotube; and S4, sintering the product in a wet nitrogen atmosphere to obtain the porous nitrogen-doped carbon coaxial coated MnO2 nanotube. The prepared porous nitrogen-doped carbon coaxial coated manganese dioxide nanotube is of a porous structure, so that the conductivity of MnO2 can be greatly improved, the ion transmission rate is increased, and meanwhile, the morphology and structure stability of carbon is improved.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, and more particularly to a porous nitrogen doped carbon coaxial coated manganese dioxide nanotube and preparation method and application. Background technique [0002] The lithium-ion battery has advantages of a new type of high energy electrochemical power supply, with high quality, high comparison capacity, small clean pollution, and safe and quick and discipline, which has become a laptop, mobile phone, camera and other digital products preferred power supply, lithium ions. The development of batteries has a great role in effectively alleviating environmental pollution problems and meeting people's growing life. The market is often used as a graphite and metal oxide material for the negative electrode material. The graphite material is well used as a negative electrode material due to its high mechanical strength, but the active site inside the body may be reacted with a lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505B82Y30/00B82Y40/00
CPCH01M4/362H01M4/505B82Y30/00B82Y40/00Y02E60/10
Inventor 董轶凡袁勋龙赖娅楠夏帆
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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