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Transition metal oxide/ graphene composite material and preparation method thereof

A transition metal and composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of large volume change and capacity attenuation, and achieve the effect of simple process, small particle size and low cost

Inactive Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although this reaction can provide a high capacity, the rapid capacity decay is caused by the large volume change during the lithium-deintercalation process.

Method used

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  • Transition metal oxide/ graphene composite material and preparation method thereof
  • Transition metal oxide/ graphene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] with CuCl 2 2H 2 O as raw material, the CuCl 2 2H 2 O dissolved in deionized water to make 80 mL of CuCl 2 Concentration is the solution of 0.02mol / L, then add 20 milligrams of GO to make mixed solution; Place the mixed solution in the autoclave (filling degree 80%, volume percentage) that the capacity is 100 milliliters, add 0.25 gram surfactant CTAB and 40 μL of hydrazine hydrate, and then adjust the pH value to 11 with 6mol / L KOH aqueous solution, then seal the reaction vessel, react at 180°C for 12 hours, and cool to room temperature naturally; collect the solid reaction product, and pass the product through deionized water Alternately and repeatedly washing with absolute ethanol, drying to obtain 0.12g CuO / graphene composite material, wherein the weight percentage of graphene is 7%.

[0030] The X-ray diffraction pattern and the scanning electron microscope photo of the composite material of gained are respectively as follows figure 1 and figure 2 , it can b...

Embodiment 2

[0033] with FeCl 3 ·6H 2 O as raw material, FeCl 3 ·6H 2 O dissolved in ethylene glycol to make 80 mL of FeCl 3 Concentration is the solution of 0.03mol / L, add 15 milligrams of GO again and make mixed solution; The mixed solution is placed in the autoclave (filling degree 80%, volume percentage) that the capacity is 100 milliliters, add 0.3 gram surfactant PVP (The number of moles is converted to the molecular weight of N-vinylpyrrolidone monomer) and 30 μL of hydrazine hydrate, then adjust the pH value to 8 with 25 wt% ammonia water, then seal the reaction kettle, react at 200 ° C for 4 hours, and cool naturally to room temperature; the solid reaction product was collected, the product was washed alternately and repeatedly with deionized water and absolute ethanol, and dried to obtain 0.18g Fe 2 o 3 / graphene composite material, wherein the weight percentage of graphene is 4%.

[0034] It can be seen from the X-ray diffraction pattern and the scanning electron micrograp...

Embodiment 3

[0037] With Cr(NO 3 ) 3 9H 2 O as raw material, Cr(NO 3 ) 3 9H 2 O was dissolved in absolute ethanol to prepare 80 ml of Cr(NO 3 ) 3 Concentration is the solution of 0.05mol / L, add 40 milligrams of GO again and make mixed solution; The mixed solution is placed in the autoclave (filling degree 80%, volume percentage) that the capacity is 100 milliliters, add 0.5 gram surfactant SDS and 100 μL of hydrazine hydrate, and then adjust the pH value to 10 with 6mol / L NaOH aqueous solution, then seal the reaction vessel, react at 160°C for 24 hours, and cool to room temperature naturally; collect the solid reaction product, and pass the product through deionized water Wash with absolute ethanol alternately and repeatedly, and dry to obtain 0.3g Cr 2 o 3 / graphene composite material, wherein the weight percentage of graphene is 8%.

[0038] It can be seen from the X-ray diffraction pattern and the scanning electron micrograph of the composite material obtained that the composit...

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Abstract

The invention discloses a transition metal oxide / graphene composite material, which consists of a nanometer transition metal oxide and graphene, wherein the transition metal oxide is MnO, Fe2O3, Cr2O3, Cu2O, CuO or V2O5. Because of the dispersing and loading effects of the graphene, the transition metal oxide in the composite material can be distributed uniformly and is small in particle size, and the stability and the cyclical stability of the transition metal oxide in the process of charging and discharging can be effectively improved. The invention also discloses a one-step low-temperature preparation method of the composite material, which has the advantages of simple process, low cost, short cycle, low energy consumption and the like, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of composite materials for lithium ion batteries, in particular to a transition metal oxide / graphene composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones, and notebook computers. They also have application prospects for electric bicycles and electric vehicles. At present, commercial lithium-ion batteries generally use carbon-based negative electrode materials. Although this material has high stability, its theoretical capacity is only 372mAh g. -1 . [0003] Compared with carbon materials, certain transition metal oxides have higher theoretical capacity, such as Fe 2 o 3 The theoretical capacity is as high as 1000mAh·g -1 . This type of transition metal oxide has one ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 谢健宋文涛刘双宇郑云肖曹高劭赵新兵
Owner ZHEJIANG UNIV
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