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Eggshell-yolk structured cobaltosic oxide-nitrogen doped carbon/carbon nanocage composite material and preparation method and application thereof

A nanocomposite material, cobalt tetroxide technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of volume expansion and contraction effects, poor material cycle stability, low rate capacity, etc. Increased storage sites, significant confinement effect, and improved conductivity

Active Publication Date: 2020-05-22
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of metal oxide materials is poor, and its rate capacity is low; at the same time, in the process of repeated charge and discharge, the volume will undergo serious expansion and contraction effects, resulting in material pulverization, which makes the cycle stability of the material poor.

Method used

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  • Eggshell-yolk structured cobaltosic oxide-nitrogen doped carbon/carbon nanocage composite material and preparation method and application thereof
  • Eggshell-yolk structured cobaltosic oxide-nitrogen doped carbon/carbon nanocage composite material and preparation method and application thereof
  • Eggshell-yolk structured cobaltosic oxide-nitrogen doped carbon/carbon nanocage composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of embodiment 1 carbon nanocage

[0038]The first is the preparation process of carbon nanocages: add 600ml of absolute ethanol, 80ml of water, and 24ml of ammonia (25wt%) into a 1000ml round-bottomed flask, and after stirring for 5min to form a uniform mixed solution, 27.68ml of tetraethyl silicate The ester was added dropwise into the mixed solution, and after 5 min was added, the stirring was continued for 15 min, then 3.2 g of resorcinol was added, and then 4.48 ml of formaldehyde solution (37 wt %) was added dropwise to the above solution, and after stirring at room temperature for 24 h, Centrifuge, wash, dry, and place the obtained powder in a tube furnace for sintering (sintering conditions: under nitrogen atmosphere, heating rate 2°C / min, sintering at 700°C for 5h), and finally put the sintered product at 80°C, 500ml , etched in 1mol / L sodium hydroxide solution for 2h, filtered with suction, washed, and dried to obtain carbon nanocages.

Embodiment 2

[0039] Example 2 Preparation of cobalt tetroxide-nitrogen-doped carbon / carbon nanocage composite material of eggshell-egg yolk structure

[0040] The method of simple co-precipitation combined with high-temperature calcination realizes the limited growth of cobalt tetroxide. The preparation process is:

[0041] Weigh 0.12g of the carbon nanocage powder prepared in Example 1 and 0.582g of cobalt acetate tetrahydrate and disperse them in 30ml of methanol solution, stir for 4h to form solution A;

[0042] Weigh 0.656g of 2-methylimidazole and disperse in 30ml of methanol solution, stir for 4h to form solution B.

[0043] Solution B was added dropwise into solution A, stirred and reacted at room temperature for 24 h, centrifuged, washed with water and ethanol 3 times, and dried to obtain precursor powder ZIF-67 / carbon nanocage composite (ZIF-67@CNC).

[0044] The dried precursor powder was calcined in a tube furnace at high temperature, and sintered at 550 °C for 2 h at a heating...

experiment example

[0050] figure 1 It is the XRD pattern of the cobalt tetroxide-nitrogen-doped carbon prepared in Comparative Example 1 and the cobalt tetroxide-nitrogen-doped carbon / carbon nanocage composite material prepared in Example 2. From figure 1 It can be seen from the XRD patterns of the two materials that the peaks on the XRD patterns of the two materials correspond to the peaks of tricobalt tetroxide, indicating that after the two-step calcination, the free-growing ZIF-67 and the confined-growing ZIF-67@CNC were successfully transformed into into tricobalt tetroxide-nitrogen-doped carbon and tricobalt tetroxide-nitrogen-doped carbon / carbon nanocage composites.

[0051] The precursor powder ZIF-67 prepared in comparative example 1, the tricobalt tetroxide-nitrogen-doped carbon material prepared in comparative example 1, the precursor powder ZIF-67 / carbon nanocage composite material prepared in embodiment 2 and the tricobalt tetroxide prepared in embodiment 2 - Nitrogen-doped carbon...

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Abstract

The invention discloses an eggshell-yolk structured cobaltosic oxide-nitrogen doped carbon / carbon nanocage composite material and a preparation method and application thereof. The preparation method comprises the following steps: 1) preparing a carbon nanocage; 2) growing a metal organic framework ZIF-67 crystal in the carbon nanocage prepared in the step 1) in a confinement manner to obtain a ZIF-67 / carbon nanocage composite material; 3) taking the ZIF-67 / carbon nanocage composite material as a precursor, and performing high-temperature calcination to form a cobaltosic oxide-nitrogen-doped carbon / carbon nanocage porous nano composite material; and 4) taking the cobaltosic oxide-nitrogen-doped carbon / carbon nanocage porous nano composite material as the anode material of the lithium ion battery. The composite material prepared by the invention has the advantages of high capacity, good rate capability, strong cycling stability, simple preparation process and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and specifically relates to an eggshell-egg yolk structure cobalt tetroxide-nitrogen-doped carbon / carbon nanocage composite material and its preparation method and application. Background technique [0002] With the consumption of traditional energy sources such as fossil fuels coal, oil, and natural gas, and the environmental degradation caused by the combustion of these fuels, it is imminent to find clean and renewable new energy sources. In recent years, due to the advantages of long cycle life, high energy density, high specific capacity, and low environmental pollution, high-performance lithium-ion batteries have been more and more widely used in new energy vehicles, portable electronic devices and other fields. [0003] At present, the anode materials of commercial lithium-ion batteries are mainly intercalated graphite materials, but the voltage platform of graphite materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/525H01M4/625H01M4/583H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 刘安然陆小军刘松琴
Owner SOUTHEAST UNIV
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