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Cobaltous oxide/carbon composite hollow nanostructure material of dodecahedron structure and application thereof in negative electrodes of lithium batteries

A nanostructure and dodecahedron technology is applied to a cobalt oxide/carbon composite hollow nanostructure material with a dodecahedron structure and its application in the negative electrode of lithium batteries, which can solve irreversible capacity loss, limit the development of lithium batteries, problems such as low theoretical capacity, to achieve the effect of good experimental repeatability, low risk and simple reaction process

Active Publication Date: 2017-11-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current commercial anode and cathode materials are mainly composed of graphite and lithium metal oxide or lithium iron phosphate. Due to the low theoretical capacity (372mAh / g) of graphite electrodes, the development of lithium batteries in practical applications is greatly limited.
Although many emerging anode materials have shown some advantages over traditional graphite electrodes, there are still many serious challenges to be solved, such as structural damage, low cycle efficiency, and irreversible capacity loss, etc.

Method used

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  • Cobaltous oxide/carbon composite hollow nanostructure material of dodecahedron structure and application thereof in negative electrodes of lithium batteries
  • Cobaltous oxide/carbon composite hollow nanostructure material of dodecahedron structure and application thereof in negative electrodes of lithium batteries
  • Cobaltous oxide/carbon composite hollow nanostructure material of dodecahedron structure and application thereof in negative electrodes of lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of metal organic framework compound ZIF-67 containing cobalt metal: 498mg Co(NO 3 ) 2 ·6H 2 O and 1400mg of 2-methylimidazole were dissolved in 50mL of methanol to form a clear solution, and then the two solutions were mixed and allowed to stand at room temperature for 6h. The obtained product was processed by centrifugation (7000rpm, 10min) and washed three times with methanol to obtain the nanostructure material of metal-organic framework compound ZIF-67 dodecahedron containing cobalt metal.

[0018] (2) Preparation of cobalt ion-coordinated polymer hollow nanostructures: the cobalt-containing metal-organic framework compound ZIF-67 nanostructures prepared in step (1) were dispersed in methanol to form a concentration of 2 mg / mL Dispersions. Take 1 mL of the dispersion, add 1.5 mL of methanol and 0.5 mL of a 20 mM dopamine solution in methanol, and place the reaction system at 60° C. under reflux and stir for 12 h. The obtained product was centrifu...

Embodiment 2

[0022] (1) Preparation of metal organic framework compound ZIF-67 containing cobalt metal: 600mg Co(NO 3 ) 2 ·6H 2 O and 790mg of 2-methylimidazole were dissolved in 50mL of methanol to form a clear solution, and then the two solutions were mixed and allowed to stand at room temperature for 24h. The obtained product was centrifuged (7000rpm, 10min) and washed three times with methanol to obtain a cobalt metal-containing metal-organic framework compound ZIF-67 nanostructure material.

[0023] (2) Preparation of polymer hollow nanostructures coordinated by cobalt ions: the cobalt-containing metal-organic framework compound ZIF-67 nanostructure material prepared in step (1) was dispersed in methanol to form a concentration of 2 mg / mL Dispersions. 1 mL of the dispersion was taken, 1.5 mL of methanol and 0.5 mL of a 20 mM dopamine solution in methanol were added thereto, and the reaction system was refluxed and stirred at 60° C. for 12 h. The obtained product was centrifuged (7...

Embodiment 3

[0026](1) Preparation of the working electrode of lithium ion battery: the cobalt oxide / carbon composite hollow nanostructure material prepared in Example 1, acetylene black and polyvinylidene fluoride (PVDF) are 80:10:10 according to the weight ratio Mix in the electrolyte (the electrolyte is a mixture of dimethyl carbonate and ethylene carbonate at a volume ratio of 1:1). The mixture solution was uniformly coated on the copper sheet, and dried under vacuum at 100° C. for 10 h.

[0027] (2) Lithium-ion charge-discharge cycle test of the electrode: The charge-discharge test is performed with a Land CT2001A battery test system under the conditions of a voltage range of 0.01-3V and different current densities.

[0028] Lithium-ion battery performance results of electrode materials such as Figure 4 As shown, the first discharge specific capacity of the cobalt oxide / carbon composite hollow nanostructure material can reach 1301mAh g -1 , and the specific capacity can be stabiliz...

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Abstract

The invention disclose a cobaltous oxide / carbon composite hollow nanostructure material of dodecahedron structure and application of the cobaltous oxide / carbon composite hollow nanostructure material in negative electrodes of lithium batteries, and belongs to the technical field of preparation of negative electrode materials for lithium batteries. The method comprises the following specific steps: (1) preparing and purifying an organic frame compound ZIF-67 containing cobalt metal; (2) reacting a dopamine monomer with the organic frame compound ZIF-67 containing cobalt metal to generate a cobalt ion coordinated hollow polymer nanostructure; and (3) under the condition of nitrogen production, carbonizing the hollow polymer nanostructure at the temperature of 500 to 600 DEG C to obtain the hollow nanostructure material. The dimensions of the hollow nanostructure material can be adjusted according to the dimensions of the template metal organic frame compound ZIF-67 nanostructure; in the performance testing process of lithium ion batteries, the hollow nanostructure material, as a negative electrode active material, has preferable cycle performance, rate capacity and stability. Therefore, the cobaltous oxide / carbon composite hollow nanostructure material, as the negative electrode active material, can be of preferable application values and prospects in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode composite active materials of lithium ion batteries, and specifically relates to a cobalt oxide / carbon composite hollow nanostructure material with dodecahedral structure and its application in lithium battery negative electrodes. Metal oxides are doped into the hollow carbon nanostructure of the hehedral structure to obtain composite active materials with high capacity, excellent stability, cycle life and rate performance, which are applied to the anode materials of lithium-ion batteries. Background technique [0002] Due to its high energy and power density, long service life, no memory effect and environmental protection, lithium batteries have become the most potential and promising devices in the field of energy storage. The current commercial anode and cathode materials are mainly composed of graphite and lithium metal oxide or lithium iron phosphate. Due to the low...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/525H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 张恺相思源陈一新杨柏
Owner JILIN UNIV
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