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Grapheme/rare earth oxide nanometer composite material and preparation method and application thereof

A technology of nanocomposite materials and rare earth oxides, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as no public reports, and achieve simple process, high conductivity, and improved The effect of electrochemical performance

Inactive Publication Date: 2013-04-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no public report on the preparation method of graphene / rare earth oxide nanocomposite material and the preparation method of using its composite material as lithium ion battery negative electrode material

Method used

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  • Grapheme/rare earth oxide nanometer composite material and preparation method and application thereof
  • Grapheme/rare earth oxide nanometer composite material and preparation method and application thereof
  • Grapheme/rare earth oxide nanometer composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Disperse 0.5g of graphene oxide in 100mL of distilled water and ultrasonicate for 2 hours; at the same time, weigh 0.5g of cerium chloride and dissolve it in 50mL of water, then mix and stir the two evenly, adjust the pH to 8, and sonicate for 5h , and then add 5mL of hydrazine hydrate to the mixed solution, pour it into a high-pressure hydrothermal kettle, heat up to 120°C, react for 12 hours, filter, wash, and freeze-dry to obtain a graphene / cerium oxide nanocomposite material. figure 1 , Figure 4 , Figure 7 They are the XRD diagram, SEM diagram and TEM diagram of the graphene / cerium oxide nanocomposite material respectively. From the above diagram, it can be clearly seen that the cerium oxide nanoparticles are spherically dispersed on the graphene surface, so that the graphene is well dispersed and No agglomeration, the spherical diameter of the cerium oxide nanoparticles is about 5-10nm, and the graphene sheet is 1-3 layers.

Embodiment 2

[0035] Example 2: Disperse 0.3g of graphene oxide in 100mL of distilled water and ultrasonicate for 1 hour; at the same time, weigh 0.6g of lanthanum chloride and dissolve it in 50mL of water, then mix and stir the two evenly, adjust the pH to 8, and sonicate for 3h , and then add 3mL of hydrazine hydrate to the mixed solution, pour it into a high-pressure hydrothermal kettle, raise the temperature to 150°C, and filter, wash, and freeze-dry after reacting for 8 hours to obtain a graphene / lanthanum oxide nanocomposite material. figure 2 , Figure 5 , Figure 8 They are the XRD diagram, SEM diagram and TEM diagram of the graphene / lanthanum oxide nanocomposite material respectively. From the above diagram, it can be clearly seen that nano-lanthanum oxide is dispersed on the surface of graphene in a rod shape, so that the graphene is well dispersed without Agglomerated, the diameter of the nano-lanthanum oxide rod is about 5-8nm, the diameter is about 30-50nm, and the graphene s...

Embodiment 3

[0036] Example 3: Disperse 0.4 g of graphene oxide in 100 mL of distilled water, and ultrasonicate for 1 hour; at the same time, weigh 1.2 g of yttrium chloride and dissolve it in 50 mL of water, then mix and stir the two evenly, adjust the pH to 8, and sonicate for 5 hours , and then add 4mL of hydrazine hydrate to the mixed solution, pour it into a high-pressure hydrothermal kettle, heat up to 180°C, and filter, wash, and freeze-dry after reacting for 6 hours to obtain a graphene / yttrium oxide nanocomposite material. image 3 , Image 6 , Figure 9 They are the XRD diagram, SEM diagram and TEM diagram of the graphene / yttrium oxide nanocomposite material respectively. From the above diagram, it can be clearly seen that nano-yttrium oxide is dispersed on the surface of graphene in sheet form, so that graphene is well dispersed and No agglomeration, the diameter of the nanometer yttrium oxide sheet is about 50-100nm, the thickness is about 10-30nm, and the graphene sheet is 1-...

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Abstract

The invention relates to a graphene / rare earth oxide nanometer composite material and a preparation method and application thereof. The preparation method comprises the following steps of: uniformly mixing oxidized graphene dispersion liquid and a soluble rare earth compound at the weight ratio of (1:1)-(1:10), regulating a pH value to alkalescence, and carrying out hydrothermal reaction to obtain the graphene-rare earth oxide nanometer composite material; and uniformly mixing the oxidized graphene dispersion liquid and the soluble rare earth compound at the weight ratio of (1:1)-(1:10), adding a reducer, and carrying out reflux reaction at certain temperature to obtain the graphene-rare earth oxide nanometer composite material. According to the invention, rare earth oxides are successfully loaded to the surface of graphene, the rare earth oxides can be connected in a physical loading or chemical bonding way because of the electrostatic action of the surface of the oxidized graphene and uniformly dispersed to the surface of a nanometer graphene sheet by being formed into nanometer level particles, the particle size is 5-50 nanometers, and the sheet thickness is 1-5 layers, so that the agglomeration phenomena of the graphene is obviously improved, and the electrochemical property of the graphene nanometer composite material as a cathode material and the circulation stability of the graphene nanometer composite material in the charge-discharge process are effectively enhanced and superior to those the cathode of the traditional commercial lithium ion battery. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, and the like.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and specifically relates to a graphene / rare earth oxide nanocomposite material, a preparation method and an application thereof. Background technique [0002] With the increasing shortage of energy and severe environmental problems, the development and application of new energy materials has become the focus of human society, and how to improve energy utilization has also become a research hotspot. In today's information society, the development of various energy-consuming electronic devices and electric and hybrid vehicles has put forward higher requirements for its energy storage lithium-ion batteries. Many aspects such as cycle performance are stretched. Therefore, new lithium-ion battery anode materials are developed to meet future related applications. [0003] Graphene is a monoatomic layer of carbon atoms discovered in 2004 2 The new two-dimensional nanomaterials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 王国建戴进峰吴承恳
Owner TONGJI UNIV
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