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Double-layer carbon-coated cobalt-based/cobalt-based chalcogenide composite electrode material, and preparation method and application thereof

A carbon-coated cobalt-based, composite electrode technology, applied in the preparation/purification of carbon, battery electrodes, carbon compounds, etc., can solve the problems of incomplete structure and volume change, achieve low cost, alleviate volume expansion, maintain The effect of structural integrity

Active Publication Date: 2021-12-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing problems of severe volume change and incomplete structure during the charge-discharge cycle in the prior art, and to provide a double-layer carbon-coated cobalt-based composite electrode material and its preparation method

Method used

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  • Double-layer carbon-coated cobalt-based/cobalt-based chalcogenide composite electrode material, and preparation method and application thereof
  • Double-layer carbon-coated cobalt-based/cobalt-based chalcogenide composite electrode material, and preparation method and application thereof
  • Double-layer carbon-coated cobalt-based/cobalt-based chalcogenide composite electrode material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Co@NC Composite Electrode Material

[0036] Dissolve 0.9g cobalt nitrate hexahydrate and 0.9g zinc nitrate hexahydrate in 12mL deionized water and stir for 30 minutes; dissolve 5.5g 2-methylimidazole in 20mL aqueous solution and stir for 30 minutes, then 2-methylimidazole The solution was added to the above solution, stirred for 6 hours, the blue precipitate was collected by separation, washed with ethanol, and dried overnight at 120°C to obtain Co-Zn-ZIFs; then 0.8g Co-Zn-ZIFs and 0.8g melamine were dissolved in 40mL ethanol and stirred 0.5h, collected by centrifugation. 0.8g Co-Zn-ZIFs / melamine was heated up to 800°C and kept for 2 hours to prepare Co@NC, wherein the heating rate was 3°C / min.

[0037] During the preparation of Co@NC composite electrode materials, the mass ratio of cobalt salt and zinc salt was continuously adjusted, and four ratio experiments of 0.8:1, 1:1, 1:5, and 1:2 were carried out. Under the current density of 0.5A / g, the cycl...

Embodiment 2

[0039] CoSe 2 Preparation of @NC composite electrode materials

[0040] During the experiment, the effect of different mass ratios of the inorganic-organic hybrid precursor and the melamine on the performance of the composite electrode material obtained later was also studied. Under the condition that other experimental parameters were the same, the experiments were carried out respectively. 0.6:1, 1:1, 2:1, 3:1 four ratio comparison experiments, when the melamine content is less, the carbon content decreases, the carbon coating effect is not good, when the melamine content increases, the carbon content increases High, the capacity of the composite electrode material will decrease again, the relative preferred ratio is 1:1.

[0041] Dissolve 0.9g cobalt nitrate hexahydrate and 0.9g zinc nitrate hexahydrate in 12mL deionized water and stir for 30 minutes; dissolve 5.5g 2-methylimidazole in 20mL aqueous solution and stir for 30 minutes, then 2-methylimidazole The solution wa...

Embodiment 3

[0043] Dissolve 0.9g cobalt nitrate hexahydrate and 1.35g zinc nitrate hexahydrate in 12mL deionized water and stir for 30 minutes; dissolve 5.5g 2-methylimidazole in 20mL aqueous solution and stir for 30 minutes, then 2-methylimidazole The solution was added to the above solution, stirred for 6 hours, the blue precipitate was collected by separation, washed with ethanol, and dried overnight at 120°C to obtain Co-Zn-ZIFs; then 0.8g Co-Zn-ZIFs and 0.8g melamine were dissolved in 40mL ethanol and stirred 0.5h, collected by centrifugation. 0.8g Co-Zn-ZIFs / melamine was heated up to 800°C and kept for 2 hours to prepare Co@NC, wherein the heating rate was 3°C / min. Mix 0.1g Co@NC with selenium powder and anneal at 600°C for 2 hours to obtain CoSe 2 @NC Composites.

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Abstract

The invention discloses the technical field of lithium batteries, and relates to a double-layer carbon-coated cobalt-based / cobalt-based chalcogenide composite electrode material, and a preparation method and application thereof. Metal cobalt / cobalt-based chalcogenide can be combined with carbon nanotubes and amorphous carbon in situ, and volatile metal zinc generated by pyrolysis of an inorganic-organic hybrid precursor and melamine play a synergistic effect; and complete decomposition of g-C3N4 generated by melamine at a low temperature is effectively inhibited through volatilization of metal zinc, so that more amorphous carbon is generated on the surface of the cobalt-based composite material. The conductivity is improved, the direct contact between the active material and the electrolyte is prevented, and the volume expansion in the charge-discharge process is effectively relieved to maintain the structural integrity, so that the electrochemical performance and the cycling stability of CoSe2 are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a double-layer carbon-coated cobalt-based / cobalt-based chalcogen composite electrode material, preparation method and application. Background technique [0002] The widespread use of fossil energy inevitably brings about problems such as environmental pollution and resource depletion. Therefore, the development of efficient green and sustainable energy storage devices has become a research hotspot in recent years. In recent years, lithium-ion batteries (LIBs) have been widely used in electric vehicles and portable electronic devices due to their environmental protection and high energy density; however, commercial graphite anodes with low theoretical capacity and poor performance at high current densities cannot Meet the rapidly growing requirements of electric vehicles. [0003] At present, transition metal selenides and their sulfur compounds have attracted more and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/58H01M4/62H01M10/052C01B32/05C01B32/16C01B32/168C01B19/04B82Y30/00B82Y40/00
CPCH01M4/38H01M4/581H01M4/625H01M4/628H01M10/052C01B32/05C01B32/16C01B32/168C01B19/007B82Y30/00B82Y40/00Y02E60/10
Inventor 段军飞闫天赐王永康陈召勇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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