Nitrogen-doped porous carbon/sulfur composite material and preparing method and application thereof

A technology of nitrogen-doped porous carbon and composite materials, applied in non-aqueous electrolyte battery electrodes, electrical components, battery electrodes, etc., to achieve good cycle stability, high discharge specific capacity, and enhanced electron and ion transport effects

Active Publication Date: 2016-10-05
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still necessary to simplify the preparati...

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  • Nitrogen-doped porous carbon/sulfur composite material and preparing method and application thereof
  • Nitrogen-doped porous carbon/sulfur composite material and preparing method and application thereof
  • Nitrogen-doped porous carbon/sulfur composite material and preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0037] (1) Melamine, m-phthalaldehyde, and carbon nanotubes are put into thick-walled pressure-resistant reaction flasks with dimethyl sulfoxide (0.05g / mL according to the concentration of melamine) according to the mass ratio of 100:80:24, After reacting at 180° C. for 3 days under stirring, wash with dichloromethane and separate the solid;

[0038] (2) Put the obtained solid into a tube furnace and adjust the argon flow rate to 0.12 sccm and raise the temperature to 400°C for 5 hours to obtain a nitrogen-doped porous carbon material;

[0039] (3) After mixing the obtained carbon material and elemental sulfur in a mortar at a mass ratio of 2:3, put it into a closed glass tube, raise the temperature to 155°C at a heating rate of 5°C / min and keep it warm for 20h.

[0040] After naturally cooling to room temperature, acetylene black and polyvinylidene fluoride were slurried with NMP at a mass ratio of 8:1:1, mixed uniformly and coated on aluminum foil to obtain the lithium-sulfu...

Embodiment 2

[0042] (1) Put benzidine, m-phthalaldehyde, carbon nanofibers in a mass ratio of 100:120:24, and dimethyl sulfoxide (according to the concentration of benzidine is 0.10g / mL) into a thick-walled pressure-resistant reaction bottle , after reacting at 180° C. for 3 days under stirring, wash with dichloromethane and separate the solid;

[0043] (2) Put the obtained solid into a tube furnace and adjust the argon flow rate to 0.12 sccm, heat up to 600° C. for 3.5 hours, and obtain a nitrogen-doped porous carbon material;

[0044] (3) After mixing the obtained carbon material and elemental sulfur in a mortar at a mass ratio of 3:4, put it into a closed glass tube, raise the temperature to 165°C at a heating rate of 5°C / min and keep it warm for 15h.

[0045]After naturally cooling to room temperature, acetylene black and polyvinylidene fluoride were slurried with NMP at a mass ratio of 8:1:1, mixed uniformly and coated on aluminum foil to obtain the lithium-sulfur battery cathode mate...

Embodiment 3

[0047] (1) Put aniline, benzaldehyde, and carbon nanofibers in a thick-walled pressure-resistant reaction bottle according to the mass ratio of 100:120:24, and dimethyl sulfoxide (0.06g / mL according to the concentration of aniline), and stir After reacting at 180° C. for 3 days, wash with dichloromethane and separate the solid;

[0048] (2) Put the obtained solid into a tube furnace and adjust the argon flow rate to 0.12 sccm, heat up to 800° C. for 4.5 hours, and obtain a nitrogen-doped porous carbon material;

[0049] (3) After mixing the obtained carbon material and elemental sulfur in a mortar at a mass ratio of 4:3, put it into a closed glass tube, raise the temperature to 185°C at a heating rate of 5°C / min and keep it warm for 15 hours.

[0050] After naturally cooling to room temperature, acetylene black and polyvinylidene fluoride were slurried with NMP at a mass ratio of 8:1:1, mixed uniformly and coated on aluminum foil to obtain the lithium-sulfur battery cathode ma...

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Abstract

The invention relates to a nitrogen-doped porous carbon/sulfur composite material and a preparing method and application thereof. The composite material is formed by a coaxial nitrogen-doped porous carbon material and elemental sulfur through compositing. The preparing method of the composite material includes the steps that a coaxial nitrogen-doped porous polymer/one-dimension nanometer composite material is subjected to high temperature treatment in a tube furnace under inert gas protection to form the coaxial nitrogen-doped porous carbon material, and then heat treatment compositing is carried out on the coaxial nitrogen-doped porous carbon material and the elemental sulfur to obtain the nitrogen-doped porous carbon/sulfur composite material. A lithium-sulfur battery based on the composite material is provided at the same time, the battery shows high specific discharge capacity, cycling stability and good rate performance.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, in particular to a nitrogen-doped porous carbon / sulfur composite material and its preparation method and application. Background technique [0002] With the continuous consumption of global energy and the aggravation of environmental degradation, electrochemical energy storage has become a very urgent and severe problem facing mankind in the 21st century. Among them, lithium-ion secondary batteries are widely used because of their high energy density and working voltage, no memory effect, long cycle life, and environmental friendliness. However, based on the "de-intercalation" theory, the theoretical specific capacity of current commercial lithium-ion batteries is currently less than 300mAh g -1 , the actual energy density is less than 200Wh kg -1 , far from being able to meet people's requirements for electric vehicles to travel 500km on a single charge. [0003] Elemental sulfur has a...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/13H01M4/139
CPCY02E60/10
Inventor 智林杰肖志昌宋琪
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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