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Graphene/carbon/ferroferric oxide nano composite material as well as preparation method and application thereof

A technology of nanocomposite materials and ferroferric oxide, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing the utilization rate of active materials, reducing the cycle stability of batteries, and the utilization of active materials. It can improve the overall lithium storage performance, improve the electrochemical performance, and be easy to operate.

Inactive Publication Date: 2020-05-08
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a kind of graphene / carbon / ferric oxide nanocomposite material and its preparation method and application, to solve the problem of Fe in the prior art 3 o 4 Existing as a negative electrode material alone is easy to lose electrical contact with the current collector, which reduces the utilization rate of the active material, causes irreversible structural transformation during the charge and discharge process, reduces the cycle stability of the battery, and easily causes the powdering and falling off of the active material, thereby reducing the activity. material utilization etc.

Method used

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  • Graphene/carbon/ferroferric oxide nano composite material as well as preparation method and application thereof
  • Graphene/carbon/ferroferric oxide nano composite material as well as preparation method and application thereof
  • Graphene/carbon/ferroferric oxide nano composite material as well as preparation method and application thereof

Examples

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Embodiment 1

[0029] A kind of preparation method of graphene / carbon / ferric oxide nano composite material comprises the steps:

[0030] Step 1: Weigh 6g of ferric nitrate nonahydrate, 2g of glucose and 30g of sodium chloride, dissolve them in 80mL of deionized water, then add 20mL of graphene oxide aqueous solution with a concentration of 2mg / mL, and disperse to obtain a uniform mixed solution. Then the mixed solution was continuously stirred on a heating platform at 80°C to obtain a thick solid until it was completely dry, and then ground into powder to form a composite material precursor;

[0031] Step 2: Heat the powdered composite material precursor obtained in step 1 to 500°C at a rate of 5°C / min in argon, and then cool down to room temperature after constant temperature heat treatment for 4 hours. Graphene oxide is reduced to graphene and glucose by high temperature. After thermal decomposition, it is converted into a carbon material matrix, and iron nitrate is thermally decomposed to...

Embodiment 2

[0036] Such as figure 1 and 2 Shown, the graphene / carbon / ferric oxide nanocomposite material that embodiment 1 prepares, comprises the sheet structure framework, carbon material and iron ferric oxide nanoparticle with nanometer thickness and micron width that are formed by graphene, so The sheet-like structure skeleton is connected with the carbon material to form a graphene / carbon matrix with a porous network structure, and ferroferric oxide nanoparticles are evenly distributed and embedded in the porous network structure of the graphene / carbon matrix.

[0037] In this embodiment, the carbon material obtained by the cracking of carbon-containing compounds is used as a matrix to encapsulate and carry iron tetroxide nanoparticles, and to connect graphene and oxide nanoparticles as a whole; the full dissolution of soluble iron-containing chemicals is conducive to The formation of tiny, uniformly distributed Fe3O4 nanoparticles, embedded in the carbon matrix, and the introductio...

Embodiment 3

[0039] The difference between this example and Example 1 is that in Step 2 of this example, the heat treatment is at 500° C. for 1 hour, and other technical solutions are the same as in Example 1.

[0040] By performing the electrochemical performance test as in Example 1 on the graphene / carbon / iron tetroxide negative electrode material prepared in this example, the test result is: when the cycle performance test is carried out at a current of 1A / g, the first reversible capacity is 760mAh / g, the reversible capacity after 400 cycles is 850mAh / g; in the rate performance test, the reversible capacity at 0.2A / g current is 815mAh / g, and the reversible capacity at 10A / g current is 400mAh / g.

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Abstract

The embodiment of the invention discloses a graphene / carbon / ferroferric oxide nano composite material as well as a preparation method and application thereof. The invention relates to the technical field of composite materials and energy storage. The composite material comprises a sheet-shaped structure framework, a carbon material and ferroferric oxide nanoparticles, wherein the sheet-shaped structure framework is formed by graphene and has a nanometer thickness and a micrometer width; the sheet-shaped structure framework is connected with the carbon material to form a graphene / carbon matrixwith a porous network structure, and the ferroferric oxide nanoparticles are uniformly distributed and embedded in the porous network structure of the graphene / carbon matrix. A three-dimensional porous network graphene / carbon / ferroferric oxide negative electrode material prepared by the preparation method disclosed by the invention has the characteristics of stable structure, good conductivity andhigh ion transmission efficiency, the used raw materials can be raw materials with wide sources, the preparation method is simple, and large-scale production can be realized.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of composite materials and energy storage, and in particular to a graphene / carbon / ferric oxide nanocomposite material and its preparation method and application. Background technique [0002] With the improvement of the intelligence of portable electronic devices and the rapid development of new energy vehicles, the traditional lithium-ion battery system cannot meet new requirements such as high energy density and fast charging and discharging. Fe 3 o 4 Due to the advantages of easy availability of raw materials, low cost, and high specific capacity, it is considered to be an ideal substitute material for graphite anodes, but there are also many shortcomings that need to be improved. The intrinsic conductivity of the material is low, and it is easy to lose electrical contact with the current collector, which reduces the utilization rate of the active material; it will cause irreve...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M4/131H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/131H01M4/362H01M4/523H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 秦显营李宝华孙威罗丹
Owner 深圳石墨烯创新中心有限公司
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