Nickel nitride@nitrogen doped porous carbon sphere material and preparation and application thereof in lithium-sulfur battery

A nitrogen-doped porous carbon and lithium-sulfur battery technology, which is applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of unfavorable practical promotion of lithium-sulfur batteries, small specific surface area of ​​catalysts, and insufficient reaction interface. Achieve the effects of inhibiting the shuttle effect, good electrochemical performance, and excellent capacity

Active Publication Date: 2020-06-02
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] It has been reported in the prior art that the specific surface area of ​​the catalyst used in lithium-sulfur batteries is too small, and it combines with the carbon substrate ex-situ, the catalytic activity is poor, and the reaction interface is insufficient during the charging and discharging process, resulting in too low sulfur loading in the battery pole piece, and at the same time The cost of using graphene and carbon nanotubes as carbon substrates is high, which is not conducive to the practical promotion of lithium-sulfur batteries

Method used

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  • Nickel nitride@nitrogen doped porous carbon sphere material and preparation and application thereof in lithium-sulfur battery
  • Nickel nitride@nitrogen doped porous carbon sphere material and preparation and application thereof in lithium-sulfur battery
  • Nickel nitride@nitrogen doped porous carbon sphere material and preparation and application thereof in lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0071] 5 kg of starch, 5 kg of 50nm SiO 2 Template dispersion, 80 grams of nickel acetate and 50 grams of sodium dodecylsulfonate were added to 10L of deionized water, stirred at 80°C for 5 hours to prepare a uniform spray slurry, and the slurry was added to the spray pyrolysis via a peristaltic pump After the system, under the ammonia atmosphere, set the spray volume through the spray system to 5mL / min, and the atomization pressure to 5MPa. The spray solution is sprayed and pyrolyzed in the high-temperature pyrolysis furnace at 1000°C, and the spray pyrolysis products are collected. The product was mixed with 5 L of 5 mol / l sodium hydroxide solution, and the silica template was washed away in a reaction kettle at 80 degrees Celsius. The material is a uniform spherical particle with a particle size of about 5 microns and a pore volume of 2.18 cm 3 / g, the specific surface area is 1668m 2 / g, from figure 1 It can be seen that the inside of the spherical particle is composed ...

Embodiment 2

[0075] 5 kg of starch, 5 kg of 500nm SiO 2 Template dispersion, 80 grams of nickel acetate and 50 grams of sodium dodecylsulfonate were added to 10L of deionized water, stirred at 80°C for 5 hours to prepare a uniform spray slurry, and the slurry was added to the spray pyrolysis via a peristaltic pump After the system, under the ammonia atmosphere, set the spray volume through the spray system to 50mL / min, and the atomization pressure to 35MPa. The spray solution is sprayed and pyrolyzed in the high-temperature pyrolysis furnace at 1000°C, and the spray pyrolysis products are collected. The product was mixed with 5 L of 5 mol / l sodium hydroxide solution, and the silica template was washed away in a reaction kettle at 80 degrees Celsius. The material is a uniform spherical particle with a particle size of about 25 microns, and a pore volume of 2.21 cm 3 / g, the specific surface area is 1748m 2 / g, the interior of spherical particles is composed of hollow carbon with a diamete...

Embodiment 3

[0078] 5 kg of starch, 5 kg of 150nm SiO 2Template dispersion, 400 g of nickel acetate and 50 g of sodium dodecylsulfonate were added to 10 L of deionized water, stirred at 80°C for 5 hours to prepare a uniform spray slurry, and the slurry was added to the spray pyrolysis via a peristaltic pump After the system, under the ammonia atmosphere, set the spray volume through the spray system to 20mL / min, and the atomization pressure to 20MPa. The spray solution is sprayed and pyrolyzed in the high-temperature pyrolysis furnace at 1000°C, and the spray pyrolysis products are collected. The product was mixed with 5 L of 5 mol / l sodium hydroxide solution, and the silica template was washed away in a reaction kettle at 80 degrees Celsius. The material is uniform spherical particles with a particle size of about 10 microns and a pore volume of 1.64 cm 3 / g, the specific surface area is 1356m 2 / g, the interior of the spherical particle is composed of hollow carbon with a diameter of a...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly discloses a nickel nitride@nitrogen-doped porous carbon sphere material. The nickel nitride@nitrogen-doped porous carbon sphere material is a porous carbon sphere which comprises a plurality of template etching holes and is of a through hole structure; the carbon skeleton of the porous carbon sphere is nitrogen-doped disordered carbon; active particles are distributed in the skeleton in an in-situ dispersion manner; the active particles are nickel nitride particles coated with in-situ graphitized carbonon the surfaces. The invention further provides a preparation method of the material and application of the material in a lithium-sulfur battery. The carbon material is uniform in granularity, the active substance sulfur can be efficiently stored due to the rich through macroporous structure, rich reaction interfaces and lithium ion transmission channels are provided, and efficient electronic conductivity can be provided through local graphitization. In addition, the polarity of the carbon substrate can be improved through the nitrogen-doped porous carbon spheres, and the nitrogen-doped porouscarbon spheres have strong adsorption conversion capacity on polysulfide in cooperation with high-dispersion nickel nitride particles.

Description

technical field [0001] The invention relates to the field of battery electrode material preparation, in particular to a lithium-sulfur battery cathode material. Background technique [0002] The gradual depletion of fossil energy, the rapid development of portable electronic devices, electric and hybrid vehicles and large energy storage devices force people to develop secondary batteries with higher energy density. As a light-weight, multi-electron reaction positive electrode material, sulfur has a theoretical specific capacity of up to 1675mAh / g, and sulfur is abundant in reserves, low in price, and environmentally friendly. Lithium-sulfur batteries composed of metal lithium negative electrodes are considered to be the next generation High specific energy battery with the most application potential. However, there are still many scientific issues to be resolved before lithium-sulfur batteries can be brought to the market, the most important of which is how to improve the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M10/052
CPCH01M4/366H01M4/38H01M4/58H01M4/583H01M10/052H01M2004/028Y02E60/10
Inventor 张治安郑景强赖延清张伟覃富荣洪波张凯李劼
Owner CENT SOUTH UNIV
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