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Porous carbon material, preparation method thereof, porous carbon/sulfur composite material, battery positive electrode material, lithium sulfur battery and application of lithium sulfur battery

A technology of porous carbon materials and composite materials, applied in the field of battery energy materials, can solve the problems of single porous structure of porous carbon, poor stability of electrode material structure, fast attenuation of battery positive electrode materials, etc., achieve rich pore structure, improve cycle High performance, energy density, and high productivity

Active Publication Date: 2019-05-14
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous carbon prepared by these two methods has a single porous structure and a small pore volume.
Porous carbon obtained by direct high-temperature carbonization of MOF materials has an extremely unstable structure and is prone to collapse and fragmentation
[0007] Patent CN201510456565.5 discloses a porous carbon sphere for lithium-sulfur batteries and its preparation method and application. The patent discloses the preparation method of porous carbon for lithium-sulfur batteries. The invention uses low-pressure chemical vapor deposition to prepare Si- C-O particles are used as templates, and then carbonized at high temperature to prepare porous carbon spheres that are disorderly entwined with ribbon-shaped graphite, and then apply the sulfur-loaded cathode materials to lithium-sulfur battery cathode materials. The attenuation is fast, the cycle stability is average, the structural stability of the electrode material is not good, and the preparation process is relatively complicated, which is not conducive to industrial production

Method used

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  • Porous carbon material, preparation method thereof, porous carbon/sulfur composite material, battery positive electrode material, lithium sulfur battery and application of lithium sulfur battery
  • Porous carbon material, preparation method thereof, porous carbon/sulfur composite material, battery positive electrode material, lithium sulfur battery and application of lithium sulfur battery
  • Porous carbon material, preparation method thereof, porous carbon/sulfur composite material, battery positive electrode material, lithium sulfur battery and application of lithium sulfur battery

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preparation example Construction

[0057] According to a first aspect of the present invention, a method for preparing a porous carbon material is provided, comprising the following steps:

[0058] Organic ligands, metal salts, carbon sources, and surfactants were added to the solvent for solvothermal reaction to obtain MOFs@C composites, and the MOFs@C composites were heat-treated to obtain porous carbon materials.

[0059] It should be noted that the "@" in the MOFs@C composite material means "and", here is a composite material composed of carbon-coated MOFs.

[0060] MOFs is the abbreviation of metal organic framework compound (English name Metal organic Framework).

[0061] The type of organic ligands is not limited, and the organic ligands commonly used by those skilled in the art can be used. For example, it can be a carboxylic acid ligand or an imidazole ligand, and the carboxylic acid ligand can be an aromatic carboxylic acid ligand. entities, including but not limited to terephthalic acid, trimesic ac...

Embodiment 1

[0102] (1) Preparation method of porous carbon materials

[0103] A method for preparing a porous carbon material, comprising the steps of:

[0104] (1) Preparation of MOFs@C composites

[0105] Weigh 0.5g terephthalic acid, 1g zinc nitrate (Zn(NO 3 ) 2 ) and 1.6g of glucose were slowly added to a mixed solution of 60mL of DMF and ethanol (DMF / ethanol=1:1v / v), and a cationic surfactant (CTAB) was added, and rapidly stirred in a water bath at 60°C to dissolve it completely. Afterwards, it was transferred to a stainless steel polytetrafluoroethylene reactor, and after a solvothermal reaction at 165 °C for 25 h, it was filtered, washed, and dried to obtain a black-brown solid MOFs@C composite material.

[0106] (2) Preparation of porous carbon material (PC)

[0107] Take the black-brown MOFs@C composite material obtained in step (1), dry it completely at 100°C for 24 hours, put it into a quartz boat after grinding, and then place it in a tube furnace. 2 The porous carbon mat...

Embodiment 2-19

[0111] The difference between Examples 2-19 and Example 1 is that the type of organic ligand in step (1) and the mass ratio of porous carbon material (PC) and elemental sulfur (S) in step (2) are different, specifically as Table 1 shows.

[0112] Table 1

[0113]

[0114]

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Abstract

The invention provides a porous carbon material, a preparation method thereof, a porous carbon / sulfur composite material, a battery positive electrode material, a lithium sulfur battery and application of the lithium sulfur battery, and belongs to the technical field of a battery energy material. The preparation method of the porous carbon material, provided by the invention, comprises the following steps of adding an organic ligand, a metal salt, a carbon source and a surfactant into a solvent, performing solvothermal reaction to obtain a MOFs@C composite material, and performing thermal treatment on the MOFs@C composite material to obtain the porous carbon material. According to the method, the MOFs material used as a pore formation agent and the carbon source are sintered at a high temperature to prepare the porous carbon material, metal ions of the MOFs materials under the high temperature are vaporized so that pores are formed in the carbon materials, the prepared porous carbon material structure is relatively rich and is large in pore capacity and has a hierarchical porous structure, the structure strength is also superior to that of a conventional porous carbon material, theporous carbon material is suitable for loading of high-sulfur quantity, and the cycle property and the energy density of the battery can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of battery energy materials, and specifically relates to a porous carbon material and a preparation method thereof, a porous carbon / sulfur composite material, a battery positive electrode material, a lithium-sulfur battery and applications thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in today's society, and 3C products such as smartphones, notebook computers, and digital cameras play an increasingly prominent role in people's daily life, and with the gradual depletion of fossil fuels and new The development of the energy industry is in full swing. Traditional battery systems such as lead-acid batteries and nickel-metal hydride batteries can no longer meet people's requirements and needs for battery systems with advantages such as high specific capacity, long cycle life, and fast charging and discharging. Especially in recent years, the development of new energy v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 袁国龙付海阔吴理觉文定强汤依伟郑世林
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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