A preparation method of N-doped carbon-coated Mo2C/C functional composite material and application thereof in lithium sulfur battery

A functional composite material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity, poor polysulfide confinement performance, etc., and achieve good structural stability, good cycle stability, shape controllable effect

Active Publication Date: 2018-12-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single sulfur-carbon composites and nano-metal compound-sulfur composites have

Method used

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  • A preparation method of N-doped carbon-coated Mo2C/C functional composite material and application thereof in lithium sulfur battery
  • A preparation method of N-doped carbon-coated Mo2C/C functional composite material and application thereof in lithium sulfur battery
  • A preparation method of N-doped carbon-coated Mo2C/C functional composite material and application thereof in lithium sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0054] N-doped Mo at pH 8.5 2 The preparation of the C / C precursor specifically includes the following steps:

[0055] (1) 500 mg of ammonium molybdate tetrahydrate was dissolved in 150 mL of deionized water, and stirred at room temperature for 10 minutes;

[0056] (2) Add 600 mg of dopamine hydrochloride to the solution in (1), and keep magnetic stirring at room temperature;

[0057] (3) Add 300 ml of absolute ethanol into the solution of (2), and continue to stir for 30 minutes;

[0058] (4) Finally, add 1mL of 25wt% ammonia water into the mixed solution of (3), adjust the pH value of the mixed solution to 8.5, and continue to react for 2 hours;

[0059] (5) Collect the precipitate in (4) by centrifugation to obtain the precursor powder, wash with deionized water and absolute ethanol three times each, put it in an oven, and dry at 80°C for 8 hours;

[0060] The SEM image of the obtained precursor powder is as follows figure 1 shown by figure 1 It can be seen that the di...

Embodiment 2

[0062] N-doped Mo at pH 8.8 2 The preparation of the C / C precursor specifically includes the following steps:

[0063] (1) 500 mg of ammonium molybdate tetrahydrate was dissolved in 150 mL of deionized water, and stirred at room temperature for 10 minutes;

[0064] (2) Add 600 mg of dopamine hydrochloride to the solution in (1), and keep magnetic stirring at room temperature;

[0065] (3) Add 300 ml of absolute ethanol into the solution of (2), and continue to stir for 30 minutes;

[0066] (4) Finally, add 1mL of 25-28wt% ammonia water into the mixed solution of (3), adjust the pH value of the mixed solution to 8.8, and continue to react for 2 hours;

[0067] (5) Collect the precipitate in (4) by centrifugation to obtain the precursor powder, wash with deionized water and absolute ethanol three times each, put it in an oven, and dry at 80°C for 8 hours;

[0068] For the SEM image of the obtained precursor powder, see figure 1 , the precursor is a sphere with a uniform size...

Embodiment 3

[0070] N-doped Mo at pH 9.0 2 The preparation of the C / C precursor specifically includes the following steps:

[0071] (1) 500 mg of ammonium molybdate tetrahydrate was dissolved in 150 mL of deionized water, and stirred at room temperature for 10 minutes;

[0072] (2) Add 600 mg of dopamine hydrochloride to the solution in (1), and keep magnetic stirring at room temperature;

[0073] (3) Add 300 ml of absolute ethanol into the solution of (2), and continue to stir for 30 minutes;

[0074] (4) Finally, add 1 mL of concentrated ammonia water into the mixed solution of (3), adjust the pH value of the mixed solution to 9.0, and continue to react for 2 hours;

[0075] (5) Collect the precipitate in (4) by centrifugation to obtain the precursor powder, wash with deionized water and absolute ethanol three times each, put it in an oven, and dry at 80°C for 8 hours;

[0076] For the SEM image of the obtained precursor powder, see figure 1 , the precursor is a sphere with a uniform...

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Abstract

The invention discloses a preparation method of an N-doped carbon-coated Mo2C/C functional composite material and application thereof in a lithium sulfur battery. By adjusting the carbon content in acarbon layer, obtaining the precursor through self-assembly and polymer polymerization, then carbonizing and carbon coating to obtain nanospheres, the N-doped carbon-coated Mo2C/C functional compositematerial with better performance is obtained. A lay of N-doped carbon layer is coat on the surface of the molybdenum carbide nanosphere through the polymerization of macromolecules, so that the shapecan be control, A double-shell hybrid hollow Mo2C/C nanosphere composite with uniform size and good structural stability, The double-shell hybrid hollow Mo2C/C nanosphere composite exhibits excellentelectrochemical properties as cathode material for lithium sulfide batteries, including good cycle stability and high reversible specific capacity, due to its excellent double-layer absorption and protection after S loading.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a kind of N-doped carbon-coated Mo 2 Preparation method of C / C functional composite and its application in lithium-sulfur batteries. Background technique [0002] As we all know, lithium-ion secondary batteries have become the preferred power source for various electrical products due to their high operating voltage, high energy density, long cycle life and no pollution. However, with the rapid development of portable electronic devices and new energy vehicles, the demand for chemical power sources with high energy density has increased dramatically. There are many types of positive and negative electrode materials for commercial lithium-ion batteries, but if the positive and negative electrode active materials are all lithium ion "intercalation" materials, its mass specific energy is difficult to exceed 300W h / kg, so the development mass specific energy is higher The develop...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/583H01M4/62
CPCH01M4/38H01M4/583H01M4/625Y02E60/10
Inventor 刘军王卓森许希军刘政波朱敏
Owner SOUTH CHINA UNIV OF TECH
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