Preparation method and application of a kind of cobalt trioxide nano hollow sphere inlaid carbon flake-like composite material

A technology of cobalt tetroxide nanometer and composite material, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of short cycle life and low specific capacity, achieve high specific capacity and increase conductivity , the preparation method is simple and reliable

Inactive Publication Date: 2018-12-21
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method and application of a carbon flake flower-like composite material inlaid with cobalt trioxide nanometer hollow spheres, aiming at the shortcomings of current lithium-ion battery anode materials such as low specific capacity and short cycle life.

Method used

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  • Preparation method and application of a kind of cobalt trioxide nano hollow sphere inlaid carbon flake-like composite material
  • Preparation method and application of a kind of cobalt trioxide nano hollow sphere inlaid carbon flake-like composite material
  • Preparation method and application of a kind of cobalt trioxide nano hollow sphere inlaid carbon flake-like composite material

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Experimental program
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Effect test

Embodiment 1

[0024] (1) 1 g of cobalt sulfate heptahydrate, 0.7 g of glucose and 0.7 g of hexamethylenetetramine were dissolved in 40 mL of deionized water to obtain a transparent liquid;

[0025] (2) The transparent liquid prepared in step (1) was encapsulated in a PTFE-lined 50 mL autoclave, and then the autoclave was placed in an oven, and reacted at 180 °C for 24 h to obtain a flower-like microstructure. Precursor;

[0026] (3) Heat the organic precursor prepared in step (2) to 300 °C at a heating rate of 2 °C / min in nitrogen, keep the temperature for 2 h, then raise the temperature to 800 °C at a heating rate of 5 °C / min, and anneal for 2 h, obtain the composite material of reduced cobalt oxide and carbon;

[0027] (4) The material prepared in step (3) was heated to 300 °C in air at a heating rate of 5 °C / min, and kept at a constant temperature for 2 h to obtain the target product, a composite material of cobalt trioxide nanohollow spheres and carbon.

Embodiment 2

[0029] (1) 1.04 g of cobalt nitrate hexahydrate, 0.7 g of glucose and 0.7 g of hexamethylenetetramine were dissolved in 40 mL of deionized water, and electromagnetically stirred to obtain a transparent liquid;

[0030] (2) The transparent liquid prepared in step (1) was packaged in a 50 mL polytetrafluoro-lined autoclave, and then the autoclave was placed in an oven and reacted at 180 °C for 24 h to obtain a flower-like microstructure. Precursor;

[0031] (3) Heat the organic precursor prepared in step (2) to 300 °C at a heating rate of 2 °C / min in nitrogen, keep the temperature for 2 h, then raise the temperature to 800 °C at a heating rate of 5 °C / min, and anneal for 2 h, obtain the composite material of reduced cobalt and carbon;

[0032] (4) The material prepared in step (3) was heated to 300 °C in air at a heating rate of 5 °C / min, and kept at a constant temperature for 2 h to obtain the target product, a composite material of cobalt trioxide nanohollow spheres and carbo...

Embodiment 3

[0034] (1) 1.0 g of cobalt sulfate heptahydrate, 0.7 g of fructose and 0.7 g of hexamethylenetetramine were dissolved in 40 mL of deionized water, and electromagnetically stirred to obtain a transparent liquid;

[0035] (2) The transparent liquid prepared in step (1) was packaged in a 50 mL polytetrafluoro-lined autoclave, and then the autoclave was placed in an oven and reacted at 180 °C for 24 h to obtain a flower-like microstructure. Precursor;

[0036] (3) Heat the precursor prepared in step (2) to 300 °C at a heating rate of 2 °C / min in nitrogen, keep the temperature for 2 h, then raise the temperature to 800 °C at a heating rate of 5 °C / min, and anneal for 2 h , to obtain a composite material of reduced cobalt and carbon;

[0037] (4) The material prepared in step (3) was heated to 300 °C in air at a heating rate of 5 °C / min, and kept at a constant temperature for 2 h to obtain the target product, a composite material of cobalt trioxide nanohollow spheres and carbon.

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Abstract

The invention relates to a preparation method and application of a flower-shaped composite material formed by carbon plates in which cobaltosic oxide is embedded in a hollow nano sphere mode, and belongs to the technical field of a novel functional material and new energy. By use of the flower-shaped composite material fusing a cobaltosic oxide nano hollow structure with a carbon plate structure, organic coupling of multiple levels of structures is achieved, and the preparation method is simple and reliable. A carbon plate not only improves electrical conductivity of the composite material, but also plays a part in fixing hollow cobaltosic oxide nano spheres as a matrix. As a lithium ion cathode material, the carbon plate structure greatly shortens a transmission distance of the electrolyte and lithium ions, and the cobaltosic oxide hollow structure is beneficial for improving of lithium storage specific capacity and buffering of volume expansion of the oxide in the charging and discharging process, and thus, as a lithium ion battery cathode material, the composite material is helpful in developing a lithium ion battery with high specific capacity and excellent cycle performance. The invention provides a good design strategy for preparing the high-performance lithium ion battery cathode material.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon flake-shaped composite material inlaid with cobalt trioxide nanometer hollow spheres, and belongs to the technical field of new functional materials and new energy sources. Background technique [0002] Graphite is a typical anode material for lithium-ion batteries, but the theoretical specific capacity of graphite for lithium storage is low (372 mAh / g), which limits the development of high-performance lithium-ion batteries. Transition metal oxides, as anode materials for lithium-ion batteries, have the advantage of high theoretical specific capacity for lithium storage, but transition metal oxides have poor conductivity and severe volume expansion during charging and discharging, resulting in powdering and falling off of electrode active materials. Therefore, the cycle stability of batteries using transition metal oxides as anodes is generally poor. The preparation of hollow na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/52H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 赵宗彬杨琪董琰峰邱介山
Owner DALIAN UNIV OF TECH
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