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Method for preparation of ferric oxide/graphene/carbon fiber composite material

A technology for ferric oxide and composite materials, which is applied in the field of preparing new ferric oxide/graphene/carbon fiber composite materials, can solve the problems of pulverization and shedding, the reduction of lithium storage capacity of negative electrode materials, and the increase of internal resistance. , to achieve the effect of small environmental impact, improved lithium storage capacity and electron mobility

Inactive Publication Date: 2014-09-10
佛山市顺德宇红纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Fe 2 o 3 The lithium storage mechanism of the negative electrode material is different. During the charging and discharging process, the volume will expand and increase, resulting in the corresponding internal stress of the material, which will cause the material to disintegrate, pulverize and fall off easily. Finally, the lithium storage capacity of the negative electrode material will decrease, and the number of cycles will decrease. decrease sharply, the internal resistance also increases

Method used

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  • Method for preparation of ferric oxide/graphene/carbon fiber composite material
  • Method for preparation of ferric oxide/graphene/carbon fiber composite material
  • Method for preparation of ferric oxide/graphene/carbon fiber composite material

Examples

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Embodiment 1

[0022] Example 1: Take 9g of ferric oxide and 0.1g of graphene oxide in 300ml of absolute ethanol, stir for 3h, and then ultrasonically disperse for 5h. The above mixture was added to 0.9 g of carbon fiber in anhydrous ethanol solvent, stirring was continued for 3 h, followed by ultrasonic dispersion at 1.5 K Hz power for 5 h. The mixture is then washed with water and the composite material is isolated by suction filtration. Finally, the ferric oxide / graphene / carbon fiber composite material was obtained after air drying at a temperature of 40°C.

Embodiment 2

[0023] Example 2: Take 8.5g of ferric oxide and 0.15g of graphene oxide in 300ml of absolute ethanol, stir for 3h, and then ultrasonically disperse for 2h. The above mixture was added to 1.35 g of carbon fiber in ethylene glycol solvent, stirring was continued for 3 h, followed by ultrasonic dispersion at 3K Hz power for 5 h. The mixture is then washed with water and the composite material is separated by centrifugation. Finally, the ferric oxide / graphene / carbon fiber composite material was obtained after air drying at a temperature of 40°C.

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Abstract

The invention aims to develop a preparation method for a ferric oxide / graphene / carbon fiber composite material that is characterized by high lithium storage capacity, high conductivity and fast charging rate and can be used as a lithium ion secondary battery's cathode material. The method includes: firstly preparing nano-ferric oxide, then compounding the nano-ferric oxide with graphene to form a Fe2O3 / graphene composite material, and then on the basis, adding carbon fiber to further strengthen various properties of the composite cathode material so as to strengthen the lithium storage capacity and reduce the internal resistance of the cathode material. Finally, the ferric oxide / graphene / carbon fiber composite material can be obtained.

Description

1. Technical background [0001] The invention relates to a method for preparing a novel ferric oxide / graphene / carbon fiber composite material, which has a great application prospect in lithium ion secondary battery negative electrode materials. The material belongs to the field of new materials and new energy. 2. Background technology [0002] Since 1991, Sony Corporation invented the lithium battery with carbon material as the negative electrode and lithium-containing compound as the positive electrode, lithium-ion batteries have entered a stage of rapid development. Lithium-ion batteries are called green batteries for their high output power, long service life, no toxic and harmful substances, and safety and environmental protection. Lithium-ion batteries are composed of positive electrode materials, diaphragm materials, negative electrode materials, electrolytes, and casings. Among them, the electrode material as the main body of the lithium ion battery is the key to det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/62
CPCH01M4/364H01M4/52H01M4/625H01M10/0525Y02E60/10
Inventor 郑军华张斌李广兵
Owner 佛山市顺德宇红纳米科技有限公司
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