A preparation method and application of a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure

A technology of cobaltous oxide nanometer and cobalt trioxide nanometer, which is applied in the preparation and application field of carbon-wrapped porous cobaltous oxide nanomaterial with shell-core structure, to achieve the effect of improving the transmission path, simple preparation process and improving rate performance

Active Publication Date: 2021-06-04
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on carbon-wrapped porous cobaltous oxide nanocube three-dimensional materials with a shell-core structure, so it has practical significance and application value for the research and development of this material

Method used

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  • A preparation method and application of a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure
  • A preparation method and application of a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure
  • A preparation method and application of a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure

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Experimental program
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Embodiment 1

[0031] In this embodiment, the preparation steps of carbon-wrapped porous cobaltous oxide nanomaterials with a shell-core structure are as follows:

[0032] The first step, preparation of cobalt trioxide nanocubes

[0033] The hydrothermal method (also known as the hydrothermal method) was used to prepare cobalt tetroxide, and 0.04 mol of cobalt nitrate hexahydrate was dispersed in 40 mL of deionized water, and stirred until transparent under magnetic stirring; then 0.01 mol of sodium hydroxide was added to the above solution to continue Stir until a clear solution is obtained; transfer the above solution to a 50 mL polytetrafluoroethylene reactor, and place it in an oven at 180 °C for 24 h; after the reaction, the reactor is naturally cooled to room temperature, and the obtained sample is centrifuged Separated, washed three times by centrifugation with water / ethanol mixed solution, and dried at 65°C for 12 h;

[0034] The second step, preparation of PDA (polydopamine)-wrappe...

Embodiment 2

[0040] Same as Example 1, the difference is,

[0041] The fourth step, preparation of porous carbon-coated cobaltous oxide etched by hydrochloric acid

[0042] The product prepared in the third step was dispersed in a hydrochloric acid solution with a concentration of 0.1 mol / L and etched for 3 minutes, then soaked in deionized water / ethanol to remove soluble impurities, and the obtained material was vacuum-dried at 65°C after centrifugation , and a carbon-wrapped porous cobaltous oxide nanocube three-dimensional material with a shell-core structure was prepared.

[0043] The transmission electron microscope image of the carbon-wrapped porous cobaltous oxide nanocube three-dimensional material etched by hydrochloric acid in this embodiment is as follows Figure 4 shown.

Embodiment 3

[0045] Same as Example 1, the difference is,

[0046] The fourth step, preparation of porous carbon-coated cobaltous oxide etched by hydrochloric acid

[0047] The product prepared in the third step was dispersed in a hydrochloric acid solution with a concentration of 0.1 mol / L and etched for 6 min, then soaked in deionized water / ethanol to remove soluble impurities, and the obtained material was vacuum-dried at 65°C after centrifugation , and a carbon-wrapped porous cobaltous oxide nanocube three-dimensional material with a shell-core structure was prepared.

[0048] The transmission electron microscope image of the carbon-wrapped porous cobaltous oxide nanocube three-dimensional material etched by hydrochloric acid in this embodiment is as follows Figure 5 shown.

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Abstract

The invention provides a simple method for preparing a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure and its electrochemical performance as an anode of a lithium ion battery. The specific preparation steps include: preparing solid cobalt trioxide nano Cube: After the surface of the prepared nanocube is wrapped with PDA, the carbon-wrapped porous cobaltous oxide shell-core nanomaterial is obtained by medium-high temperature calcination, and finally the shell-core structure carbon-wrapped porous cobaltous oxide nanomaterial is formed by hydrochloric acid etching. The method of the present invention does not add any directing agent and surfactant to participate, the whole synthesis process has mild conditions, environmental protection, cheap raw materials, low requirements on equipment, and is convenient for industrial production. It has great advantages in the preparation of anode materials for lithium ion batteries. Great application prospects.

Description

technical field [0001] The invention relates to a synthesis method for preparing a carbon-wrapped porous cobaltous oxide nanomaterial with a shell-core structure and its application in a power lithium ion battery anode. Background technique [0002] With the continuous development of technology and the gradual change of people's lifestyle, lithium-ion batteries are becoming more and more prominent in life, and people's demand for electrode materials with high rate performance is becoming more and more urgent. As a negative electrode material for lithium-ion batteries, the theoretical specific capacity of cobaltous oxide is as high as 715mAh g -1 , is about 2 times that of graphitized carbon. However, the first coulombic efficiency and cycle performance of cobaltous oxide are poor. In order to overcome these shortcomings, the structural design of cobaltous oxide is particularly important. For example, Chinese patent document CN 103950994 B adopts organic metal cobalt salt a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/523H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 李丹苏行董玉涛马宇航张建民
Owner ZHENGZHOU UNIV
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