Method for preparing nitrogen doped carbon loaded cobaltosic oxide electrode material

A technology of tricobalt tetroxide and electrode materials, which is applied to battery electrodes, hybrid capacitor electrodes, circuits, etc., can solve problems that do not involve the regulation of carbon matrix components, and achieve good dispersion, simple process, and small particles.

Inactive Publication Date: 2017-08-04
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above invention uses carbon substrates with different shapes to modify cobalt tetroxide materials, but does not involve the composition control of carbon substrates

Method used

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  • Method for preparing nitrogen doped carbon loaded cobaltosic oxide electrode material
  • Method for preparing nitrogen doped carbon loaded cobaltosic oxide electrode material
  • Method for preparing nitrogen doped carbon loaded cobaltosic oxide electrode material

Examples

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preparation example Construction

[0013] The invention is a preparation method of a nitrogen-doped carbon-supported cobalt tetroxide electrode material, the steps of which are as follows:

[0014] (1) Mixing: Weigh the carbon source and cobalt source in a mortar according to the mass ratio of 10:1-100:1, grind and mix to obtain a viscous liquid mixture;

[0015] (2) Carbonization: put the above liquid mixture into a tube furnace, raise the temperature to 100-400°C for 10-60min in an argon atmosphere, then raise the temperature to 600-1600°C for 60-360min, cool to room temperature, and obtain the precursor body;

[0016] (3) Oxidation: The above precursor is heated to 200-700°C in an air atmosphere, kept for 20-120min and then cooled to room temperature to prepare nitrogen-doped carbon-supported cobalt tetroxide electrode material.

[0017] The carbon source described in the above preparation method is an ionic liquid, specifically 1-butyl-3-methylimidazolium tetrafluoroborate, or 1-butyl-3-methylimidazolium d...

Embodiment 1

[0021] Put 20g of 1-butyl-3-methylimidazolium tetrafluoroborate and 1g of cobalt acetate in a mortar, grind and mix them evenly, put them into a crucible, and heat them to 100°C for 30min in a tube furnace under the protection of argon. Then raise the temperature to 700°C for 120 minutes, cool to room temperature; then raise the temperature to 600°C for 30 minutes in an air atmosphere, and cool to room temperature to obtain a nitrogen-doped carbon-supported tricobalt tetroxide electrode material. The electrochemical performance test of the obtained nitrogen-doped carbon-supported cobalt tetroxide electrode material adopts CR2025 button cells, and the prepared nitrogen-doped carbon-supported cobalt tetroxide active material is mixed with the conductive agent acetylene black and the binder PVDF (polyvinylidene fluoride). 8:1:1 mix evenly, add appropriate amount of NMP (N-methylpyrrolidone) and grind evenly in an agate mortar to form a viscous jelly-like mixture, then evenly sprea...

Embodiment 2

[0023] Put 20g of 1-butyl-3-methylimidazolium dinitrile ammonium salt and 1g of cobalt acetate in a mortar, grind and mix them evenly, put them into a crucible, heat them in a tube furnace to 100°C for 30min under the protection of argon, and then Raise the temperature to 900°C for 120 minutes, cool to room temperature; then raise the temperature to 450°C for 45 minutes in an air atmosphere, and cool to room temperature to obtain a nitrogen-doped carbon-supported tricobalt tetroxide electrode material (XRD see attached figure 2 ). According to the method of Example 1, the battery was assembled and tested. Under the condition of charge and discharge rate of 0.1C, the initial discharge specific capacity of the material was 904.2mAh / g, and the capacity remained at 679.3 mAh / g after 20 cycles (see attached image 3 ).

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Abstract

The invention discloses a method for preparing a nitrogen doped carbon loaded cobaltosic oxide electrode material. The method comprises the following steps: firstly, uniformly mixing a cobalt source with an ionic liquid; putting into a tubular furnace, heating to 100-400 DEG C in the presence of argon, keeping the temperature for 10-60 minutes, continuously heating to 600-1600 DEG C, keeping the temperature for 60-360 minutes, and cooling to the room temperature; further heating to 200-700 DEG C in the presence of air, keeping the temperature for 20-120 minutes, and cooling, thereby obtaining the nitrogen doped carbon loaded cobaltosic oxide electrode material. The method is simple in preparation process, cobaltosic oxide granules are small in size and good in dispersity, and the content of nitrogen and the loading amount of the cobaltosic oxide in a carbon matrix can be adjusted. The nitrogen doped carbon matrix is good in conductivity, and a volume effect of the cobaltosic oxide granules in the charge and discharge process can be effectively prevented, so that the prepared nitrogen doped carbon loaded cobaltosic oxide electrode material is high in lithium storage capacity and good in circulation property when being used as a lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the preparation technology of electrode materials, in particular to the preparation of nitrogen-doped carbon-loaded tricobalt tetroxide electrode materials, and belongs to the technical field of energy materials and new materials. Background technique [0002] As a new type of anode material for lithium-ion batteries, metal oxide materials have the advantages of high theoretical capacity, abundant reserves, low cost, and high chemical stability, but their poor electrical conductivity leads to low charge and discharge rates for such materials. At the same time, the huge volume expansion and large initial irreversible capacity during charge and discharge limit the commercial application of such materials. In recent years, people have attempted to prepare metal oxide nanomaterials with specific morphologies in an attempt to reduce the volume change of the material during charge and discharge. In addition, researchers have tried t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01G11/32H01G11/46
CPCH01G11/32H01G11/46H01M4/362H01M4/52H01M4/583H01M4/625Y02E60/10
Inventor 蒙延双肖明军朱福良王功瑞段超宇杜梦奇王琛王磊夏军
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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