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Fe2O3 nano carbon composite material and preparation method and application thereof

A technology of composite materials and composite nanomaterials, which is applied in the field of Fe2O3 nanocarbon composite materials and its preparation, can solve the problems of battery capacity decline, poor cycle stability, and failure to prevent the aggregation and pulverization of active materials in effective electrode materials.

Active Publication Date: 2019-10-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge change in the volume of the active material (such as Fe 2 o 3 93%) and cause the aggregation and pulverization of iron oxides, resulting in rapid decline in battery capacity and poor cycle stability
To solve this problem, usually people in Fe 2 o 3 / CNT is covered with a layer of carbon layer, although the performance has been improved, but Fe 2 o 3 / Fe in CNT composites 2 o 3 directly loaded on CNT, due to Fe 2 o 3 There is no reserved space between CNT and CNT, even if the outer layer is coated with a carbon layer, it still cannot prevent the aggregation and crushing of active materials in effective electrode materials
Therefore, Fe 2 o 3 / CNT composites as raw materials to prepare carbon-coated Fe 2 o 3 / CNT composites still cannot solve the above problems

Method used

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  • Fe2O3 nano carbon composite material and preparation method and application thereof
  • Fe2O3 nano carbon composite material and preparation method and application thereof
  • Fe2O3 nano carbon composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1) First, multi-walled carbon nanotubes (MWNTs) with a diameter of 5-50 nm are selected to be carboxylated with concentrated nitric acid (65 wt %) in an oil bath at 140° C. for 6 h before use. After cooling to room temperature, filter and wash until neutral, dry for later use.

[0040] 2) Disperse carboxylated MWNTs, sodium lauryl sulfate and glucose in deionized water, and obtain a mixture solution A after ultrasonic dispersion. The specific mass ratio of carboxylated MWNTs, sodium lauryl sulfate and glucose is 20mg:2mg:(400-800)mg.

[0041] 3) The mixture solution A was transferred to a 25ml stainless steel reactor lining, sealed, and kept at 190° C. for 15 hours for hydrothermal reaction. After the reactor was naturally cooled to room temperature, the brown product was collected, washed several times with deionized water and ethanol, and finally dried at 80 °C for 12 h to obtain MWNT@C composite nanomaterials.

[0042] 4) Dissolve 160mg MWNT@C in a mixed solution o...

Embodiment 2

[0060] The difference between this example and Example 1 is that the hydrothermal reaction conditions in step 3) are 200°C for 3h, 160°C for 48h, and 180°C for 12h; step 8) high temperature carbonization temperature is selected from 450-600°C , Time 1-5h, the atmosphere is selected from nitrogen.

Embodiment 3

[0062] The difference between this example and Example 1 lies in that: step 6) the burning temperature in air is 230-550°C, and the holding time at this temperature is 0.5-12h.

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Abstract

The invention belongs to the field of nano carbon material preparation, and particularly relates to a Fe2O3 nano carbon composite material and a preparation method and application thereof. The Fe2O3 nano carbon composite material has a structural general formula: CNT@hollow Fe2O3, wherein CNT is a carbon nano tube, and the hollow Fe2O3 represents a Fe2O3 hollow tube. The material has a tube-in-tube structure, wherein an inner tube is a carbon nano tube, an outer tube is a Fe2O3 hollow tube, the inner tube is nested in the outer tube, and a certain gap space is reserved between the inner tube carbon nano tube and the outer tube Fe2O3 hollow tube. The material can be applied to a lithium ion battery, a sodium ion battery or a potassium ion battery as a negative electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of nano-carbon materials, in particular to a Fe 2 o 3 Nano carbon composite material and its preparation method and application. Background technique [0002] Iron oxide is a compound that widely exists in nature. Due to the wide range of raw materials and low price, it is expected to be used as a negative electrode material for lithium-ion batteries (LIB). However, due to the poor conductivity of pure iron oxides, their performance as a negative electrode material for lithium-ion batteries is very poor. Therefore, researchers usually load iron oxides on the surface of carbon materials to form nano-carbon composite materials, such as Fe 2 o 3 Supported on carbon nanotubes (CNTs) to form Fe 2 o 3 / CNT composite material, the performance of this material as a negative electrode material for lithium-ion batteries has been improved. However, due to the huge change in the volume of the active material ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/054
CPCH01M4/362H01M4/525H01M4/625H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 赵毅吴初新官轮辉石秀玲
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI