Nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and preparation method and application thereof

A nitrogen-doped carbon and negative electrode material technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of industrial application, environmental pollution, and price Expensive and other issues

Active Publication Date: 2022-02-08
DONGGUAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods for preparing nano-MnS composites either include complex and harsh preparation processes, or contain expensive graphene or reduced graphene oxide materials, and these in-situ methods for preparing nano-MnS often include a vulcanization step, The sublimated sulfur in this step is very easy to cause environmental pollution, which makes the low cost of the composite material, and there are still many difficulties in industrial preparation technology, and it is impossible to truly realize industrial application.

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  • Nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and preparation method and application thereof
  • Nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and preparation method and application thereof
  • Nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and preparation method and application thereof

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[0026] The invention provides a method for preparing a nitrogen-doped carbon-coated manganese sulfide composite negative electrode material, comprising the following steps:

[0027] (1) micron manganese sulfide is ball milled to obtain nanometer manganese sulfide;

[0028] (2) the nano-manganese sulfide obtained in the step (1) is mixed with a nitrogen-containing polymer and a solvent, and then dried to obtain a precursor;

[0029] (3) Calcining the precursor obtained in the step (2) to obtain a nitrogen-doped carbon-coated manganese sulfide composite negative electrode material.

[0030] Unless otherwise specified, the present invention has no special limitation on the source of each component, and commercially available products or products prepared by conventional preparation methods well known to those skilled in the art can be used.

[0031] In the invention, the micron manganese sulfide is ball-milled to obtain nanometer manganese sulfide.

[0032] In the present inven...

Embodiment 1

[0053] (1) Put 2g of micron manganese sulfide c-MnS (particle size 1~10 μm) in a zirconia ball mill tank (ball-to-material ratio is 20:1), and ball mill for 2 hours at a speed of 400rpm to obtain nanometer manganese sulfide (primary particle size 30~200nm), denoted as MnS-BM;

[0054] (2) Dissolve 0.3g of polyacrylonitrile PAN in 10mL of N,N-dimethylformamide (the volume ratio of polyacrylonitrile to N,N-dimethylformamide is 0.03g:1mL), and then add 0.7g of nano-manganese sulfide after ball milling in step (1) (the mass ratio of nano-manganese sulfide and polyacrylonitrile is 2.33:1), and after magnetic stirring in an oil bath at 80°C for 20 hours, the precursor was obtained;

[0055] (3) Place the precursor obtained in step (2) in a tube furnace, heat to 200°C for 1 h under the protection of Ar gas, then heat to 500°C for 2 h, and cool naturally to room temperature to obtain a nitrogen-doped carbon package The manganese sulfide-coated composite anode material is denoted as M...

Embodiment 2

[0057] (1) Put 3g of micron manganese sulfide c-MnS (particle size 1~10 μm) in a zirconia ball mill jar (ball-to-material ratio is 25:1), and ball mill for 2 hours at a speed of 450rpm to obtain nanometer manganese sulfide (primary particle size 30~200nm);

[0058] (2) Dissolve 0.4g polyacrylonitrile PAN in 10mL N,N-dimethylformamide (the volume ratio of polyacrylonitrile to N,N-dimethylformamide is 0.04g:1mL), and then add 0.6g of nano-manganese sulfide after ball milling in step (1) (the mass ratio of nano-manganese sulfide and polyacrylonitrile is 1.5:1), and after magnetic stirring in an oil bath at 85°C for 25 hours, the precursor is obtained;

[0059] (3) Put the precursor obtained in step (2) in a tube furnace, heat to 180°C for 1 h under the protection of Ar gas, then heat to 550°C for 2 h, and cool naturally to room temperature to obtain nitrogen-doped carbon package manganese sulfide-coated composite anode material.

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Abstract

The invention provides a nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and a preparation method and application thereof, and belongs to the technical field of negative electrode materials, and the preparation method comprises the following steps: ball-milling micron manganese sulfide, mixing the micron manganese sulfide with a nitrogen-containing polymer and a solvent, drying, and roasting to obtain the nitrogen-doped carbon-coated manganese sulfide composite negative electrode material. Nanometer manganese sulfide can be obtained by adopting micron manganese sulfide through one-step ball milling, then the nanometer manganese sulfide and a nitrogen-containing polymer solution are mixed, dried and then subjected to high-temperature roasting, the nitrogen-containing polymer is pyrolyzed to form a nitrogen-doped carbon matrix material in the high-temperature roasting process, the ion diffusion path is shortened through nanometer manganese sulfide particles, the nitrogen-doped carbon substrate material improves the electronic conductivity and the structural stability of the negative electrode material, and the negative electrode material is of a micro-nano structure, so that the specific surface area of the material is reduced, and the first efficiency and the tap density are improved, thereby ensuring the electrochemical performance of the material, especially the cycling stability under high magnification; the preparation process is simple, and no other harmful by-products are generated.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a nitrogen-doped carbon-coated manganese sulfide composite negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, no pollution to the environment, and good cycle performance. They have become one of the best green power sources with development and application prospects in recent years. The energy density and performance requirements of lithium-ion batteries in the field of electric vehicles and portable electronic devices are getting higher and higher. In order to meet this demand, the development of new high-performance lithium-ion batteries has become the primary task of lithium-ion battery development. Battery anode materials are one of the key technologies. However, the theoretical specific energy of graphite, a commonly used n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00C01B32/05B82Y30/00B82Y40/00H01M4/58H01M4/62H01M10/0525
CPCC01G45/00C01B32/05H01M4/5815H01M4/625H01M10/0525B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2002/85C01P2004/80C01P2006/40C01P2002/82C01P2004/62C01P2004/64C01P2006/12C01P2006/11Y02E60/10
Inventor 苗荣荣谢颂恒杨宇辉林想朱子坚付伟
Owner DONGGUAN UNIV OF TECH
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