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Preparation method of micron cobalt disulfide composite material

A composite material, cobalt disulfide technology, applied in the preparation/purification of cobalt sulfide and carbon, chemical instruments and methods, etc., can solve the problems of low tap density, high content of various types of impurities, single function of carbon skeleton, etc. The effect of preventing structural collapse and severe deformation, mitigating stress shocks, and enhancing mechanical properties

Active Publication Date: 2020-11-13
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For CoS 2 Preparation and CoS 2 Problems existing in compounding with carbon materials, the present invention proposes a preparation method of a micron cobalt disulfide composite material modified with surface functional groups and its application as an electrode to solve the problem of composite nano-CoS 2 The material has many types of impurities, high content, and low tap density, which cannot effectively construct a pore structure with a suitable internal pore size. At the same time, the carbon skeleton has a single function and cannot meet the new needs of high specific capacity and high energy density electrode materials.

Method used

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  • Preparation method of micron cobalt disulfide composite material
  • Preparation method of micron cobalt disulfide composite material
  • Preparation method of micron cobalt disulfide composite material

Examples

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Embodiment 1

[0023] (1) Preparation of ZIF-67 and carbon nanotube composite precursor: Dissolve 1.9g cobalt chloride, 0.6g 2-nitroimidazole, and 2.0g carbon nanotube slurry in methanol, mix well and perform solvothermal reaction, The temperature is 40°C, and the reaction time is 6h. The carbon nanotube slurry is obtained by dissolving multi-walled carbon nanotubes in N-methylpyrrolidone at a mass percentage of 7% and subjecting them to vacuum grinding at 200 r / min. The molar ratio of cobalt chloride to 2-methylimidazole is 1:0.5; the mass ratio of the total mass of cobalt chloride and 2-methylimidazole to the carbon nanotube slurry is 1:0.8.

[0024] (2) Carbonize the ZIF-67 and carbon nanotube composite precursor prepared in step (1): Slowly heat the ZIF-67 and carbon nanotube composite precursor material prepared in step (1) in a vacuum environment to obtain Porous dodecahedral composite intermediate product; the heat treatment includes a heating rate of 1°C / min, a heat treatment temper...

Embodiment 2

[0028] (1) Preparation of ZIF-67 and carbon nanotube composite precursor: Dissolve 2.9g cobalt nitrate, 1.2g 2-nitroimidazole, and 12.3g carbon nanotube slurry in diethylene glycol, mix well and perform solvothermal Reaction, the temperature is 50°C, and the reaction time is 9h. The carbon nanotube slurry is obtained by dissolving multi-walled carbon nanotubes in N-methylpyrrolidone at a mass percentage of 2% and subjecting them to vacuum grinding at 400 r / min. The molar ratio of cobalt nitrate and 2-nitroimidazole is 1:1; the mass ratio of the total mass of cobalt nitrate and 2-nitroimidazole to the carbon nanotube slurry is 1:3.

[0029] (2) Carbonize the ZIF-67 and carbon nanotube composite precursor prepared in step (1): Slowly heat the ZIF-67 and carbon nanotube composite precursor material prepared in step (1) in a vacuum environment to obtain Porous dodecahedral composite intermediate product; the heat treatment includes a heating rate of 2°C / min, a heat treatment temp...

Embodiment 3

[0033] (1) Preparation of ZIF-67 and carbon nanotube composite precursor: Dissolve 2.8g cobalt sulfate, 3g 2-pyridinecarboxylic acid, and 34g carbon nanotube slurry in ethylene glycol, mix them evenly, and perform solvothermal reaction at a temperature of 60°C, reaction time 12h. The carbon nanotube slurry is obtained by dissolving multi-walled carbon nanotubes in N-methylpyrrolidone at a mass percentage of 5%, and subjecting them to vacuum grinding at 800 r / min. The molar ratio of cobalt nitrate and 2-nitroimidazole is 1:2.5; the mass ratio of the total mass of cobalt nitrate and 2-nitroimidazole to the carbon nanotube slurry is 1:5.

[0034] (2) Carbonize the ZIF-67 and carbon nanotube composite precursor prepared in step (1): Slowly heat the ZIF-67 and carbon nanotube composite precursor material prepared in step (1) in a vacuum environment to obtain Porous dodecahedral composite intermediate product; the heat treatment includes a heating rate of 3°C / min, a heat treatment ...

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Abstract

The invention provides a preparation method of a micron cobalt disulfide composite material and application of the micron cobalt disulfide composite material as an electrode, belonging to the technical field of energy storage and conversion materials. The preparation method comprises the following steps: firstly, synthesizing a carbon nanotube reinforced metal organic framework ZIF-67 in situ, then carrying out a low-temperature controllable confinement reaction, and successively conducting carbonizing and vulcanizing to prepare the micron cobalt disulfide composite material with surface functional group modification and a porous structure. The cobalt disulfide synthesized by the method is uniformly packaged in the porous carbon skeleton, has a large specific surface area and abundant pores with proper pore diameters, and inherits surface functional group structures of a metal organic framework and a carbon nanotube. The micron cobalt disulfide composite material synthesized by the method is used as the electrode; the phenomena of side reactions, volume expansion, intermediate product dissolution and the like of the material in the charging and discharging process are effectively inhibited, the synergistic effect of embedding-conversion-pseudocapacitance hybrid energy storage is promoted, and high specific capacity, high volume energy density and excellent cycling stability areshown.

Description

technical field [0001] The invention belongs to the field of energy storage and conversion materials, in particular to the preparation of micron cobalt disulfide composite materials with surface functional group modification and its application as electrodes. Background technique [0002] Cobalt disulfide (CoS 2 ) as an electrode material has a theoretical specific capacity as high as 870 mAh / g, which has attracted widespread attention. But CoS 2 It also faces the common problems of the sulfide system, for example, the electrochemical reaction kinetics is slow, the volume change is large, and the lithium-sulfur polymer produced during the electrochemical process will undergo dissolution and shuttle effects. In addition, with other sulfides such as FeS 2 and TiS 2 Compared to CoS 2 There are also the following special problems: (1) CoS 2 The intrinsic electronic conductivity at room temperature is low, so the electrochemical performance at room temperature is worse than...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01B32/05H01M4/58H01M4/62H01M10/052H01M10/0525H01M10/054B82Y40/00
CPCC01G51/30C01B32/05H01M4/5815H01M4/625H01M10/052H01M10/0525H01M10/054B82Y40/00C01P2006/40C01P2004/03Y02E60/10
Inventor 赵硕鲁建豪薛杉杉吴略韬斯宏梁黄宗乐
Owner UNIV OF SCI & TECH BEIJING
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