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Preparation method of composite cathode material of helical carbon nanotube/graphite

A carbon nanotube and negative electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of limited improvement in battery rate performance and cycle performance, low binding force, poor flexibility, etc., and is suitable for large-scale Production and application, strong bonding, the effect of improving flexibility

Active Publication Date: 2015-06-24
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above preparation method, the carbon nanotubes are mainly grown on the surface of the graphite electrode through surface adsorption, which has poor uniformity and low binding force.
At the same time, the morphology of carbon nanotubes is linear and fibrous, with poor flexibility, and the improvement of battery rate performance and cycle performance is relatively limited.

Method used

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  • Preparation method of composite cathode material of helical carbon nanotube/graphite
  • Preparation method of composite cathode material of helical carbon nanotube/graphite
  • Preparation method of composite cathode material of helical carbon nanotube/graphite

Examples

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Embodiment 1

[0032] In this embodiment, the preparation steps of the spiral carbon nanotube / graphite composite negative electrode material are as follows:

[0033] (1) Preparation of carbon nanotube base material: Purify carbon nanotube powder with a diameter of 50nm with nitric acid solution, and then add it to N-N dimethylformamide to obtain carbon nanotubes after ultrasonic dispersion, suction filtration, and vacuum drying base material;

[0034] (2) Carbon nanotube-supported catalyst: Add the carbon nanotube substrate material in step (1) into the catalyst solution prepared by cobalt with a particle size of 10nm and citric acid at a molar ratio of 1:1 and immerse for 1 minute, and then in Insulate at 100°C for 100 minutes, carry out the above impregnation and heat preservation operations 100 times, and obtain a carbon nanotube base material loaded with catalyst;

[0035] (3) Preparation of carbon nanotube / graphite precursor: Add 5 g of the carbon nanotube substrate material loaded wit...

Embodiment 2

[0039] In this embodiment, the preparation steps of the spiral carbon nanotube / graphite composite negative electrode material are as follows:

[0040] (1) Preparation of carbon nanotube base material: Purify carbon nanotube powder with a diameter of 20 nm with nitric acid solution, then add it into ethanol, ultrasonically disperse, filter under pressure, and vacuum dry to obtain the carbon nanotube base material;

[0041] (2) Carbon nanotube-supported catalyst: add the carbon nanotube substrate material in step (1) into the catalyst solution prepared by ferric nitrate and citric acid with a particle size of 50nm according to the molar ratio of 1:2 and immerse for 10 minutes, and then Insulate at 200° C. for 10 minutes, perform the above impregnation and heat preservation operations 10 times, and obtain a carbon nanotube base material loaded with catalyst;

[0042] (3) Preparation of carbon nanotube / graphite precursor: Add 5 g of the carbon nanotube substrate material loaded wi...

Embodiment 3

[0046] In this embodiment, the preparation steps of the spiral carbon nanotube / graphite composite negative electrode material are as follows:

[0047] (1) Preparation of carbon nanotube base material: Purify the carbon nanotube powder with a diameter of 100nm with nitric acid solution, then add it into ethanol, ultrasonically disperse, filter under pressure, and vacuum dry to obtain the carbon nanotube base material;

[0048](2) Carbon nanotube-supported catalyst: Add the carbon nanotube substrate material in step (1) into the catalyst solution prepared with a particle size of 20nm iron and citric acid at a molar ratio of 1:2 and immerse for 50 minutes, and then in Insulate at 500°C for 5 minutes, carry out the above impregnation and heat preservation operations 20 times, and obtain the carbon nanotube base material loaded with catalyst;

[0049] (3) Preparation of carbon nanotube / graphite precursor: Add 5 g of the carbon nanotube substrate material loaded with catalyst in ste...

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Abstract

The invention discloses a preparation method of a composite cathode material of helical carbon nanotube / graphite, and belongs to the technical field of a battery material. The composite cathode material is inserted and coated at the surface of graphite by the helical carbon nanotube; the formed helical carbon nanotube network macro body can reserve the original appearance when the helical carbon nanotube is applied to a large extent; the defects of high winding, dispersing difficulty and the like of the helical carbon nanotube in the composite material are effectively avoided; the application performance of the helical carbon nanotube and the electrochemical performance of the composite cathode material are greatly improved. A nano-catalyst and citric acid are taken as catalyst solution; the helical carbon nanotube prepared by a chemical vapor deposition is higher in mechanical strength than that of the carbon nanotube, and stronger in binding force with the graphite; not only can the flexibility of a battery pole piece be improved; but also the reject ratio of the battery can be reduced; and the method is simple, easy to operate and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to a preparation method of an ion battery negative electrode material, in particular to a preparation method of a helical carbon nanotube / graphite composite negative electrode material, and belongs to the technical field of battery materials. Background technique [0002] Lithium-ion battery is a new type of energy storage element that has developed rapidly in recent years. It is mainly composed of positive and negative electrodes, electrolyte and diaphragm. There are many factors that affect battery performance, and the cycle life of the battery is mainly determined by the negative electrode material. At present, in terms of improving the cycle life of lithium-ion batteries, negative electrode materials mainly improve the cycle life of batteries through material surface modification, such as growing carbon nanomaterials on the surface of graphite substrates to increase the transmission rate of lithium ions during charge and disch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCY02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH