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Novel carbon-carbon nanotube lithium ion battery cathode material and preparation method thereof

A technology of lithium-ion batteries and carbon nanotubes, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large irreversible capacity of carbon nanotubes, affecting physical and electrochemical performance, and no charge-discharge platform, etc., to achieve good performance Axial one-dimensional conductivity, excellent anti-attenuation performance, and the effect of a good voltage platform

Inactive Publication Date: 2013-06-05
YANGZHOU YET NEW ENERGY MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the irreversible capacity of carbon nanotubes is also large, the first cycle efficiency is low, and there is no obvious charge-discharge platform
In addition, due to its small diameter and large aspect ratio, it is easy to agglomerate and not easily dispersed, which affects its physical and electrochemical performance.

Method used

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Examples

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preparation example Construction

[0016] The preparation method of novel carbon-carbon nanotube lithium ion battery negative electrode material comprises the following steps:

[0017] 1) Prepare raw materials: spherical graphite, carbon nanotubes, organic carbon powder;

[0018] 2) Put the carbon nanotubes and organic carbon powder in step 1) into the ball mill in batches for multiple grading and mixing. When putting in batches, one of the materials is put in at one time, and the other material is divided into five Putting in each time, the interval between each putting is 1-2 hours, and the total mixing time is 10-12 hours to obtain the coating material, the particle size of the coating material is 2-6 μm; the carbon nanotubes and organic carbon The weight ratio of powder is 3:7;

[0019] 3) Stir the spherical graphite in step 1) and the coating material prepared in step 2) to make them fully mixed, and the stirring and mixing time is 1-3 hours, so that the coating material is evenly wrapped on the surface o...

Embodiment 1

[0023] The preparation method of novel carbon-carbon nanotube lithium ion battery negative electrode material comprises the following steps:

[0024] 1) Prepare 10KG of spherical graphite as the nucleation matrix, carbon nanotubes and organic carbon powder;

[0025] 2) Put the carbon nanotubes and organic carbon powder in step 1) into the ball mill in batches for multiple graded mixing. First put all the carbon nanotubes into the ball mill, and then put the organic carbon powder in five times on average. The interval time of putting in once is 1.5 hours, and total mixing time is 10 hours, obtains coating material 0.87KG, and the particle diameter of coating material is 2 μm; The weight ratio of described carbon nanotube and organic carbon powder is 3:7;

[0026] 3) Fully stir 10KG of spherical graphite and 0.87KG of coating material in a stirring device for 1 hour, so that the coating material is evenly wrapped on the surface of spherical graphite; 8%;

[0027] 4) The spheri...

Embodiment 2

[0030] The preparation method of novel carbon-carbon nanotube lithium ion battery negative electrode material comprises the following steps:

[0031] 1) Prepare 10KG of spherical graphite as the nucleation matrix, carbon nanotubes and organic carbon powder;

[0032] 2) Put the carbon nanotubes and organic carbon powder in step 1) into the ball mill in batches for multiple grading and mixing. First put all the organic carbon powder into the ball mill, and then put the carbon nanotubes in five times on average. The interval time of putting in once is 1 hour, and total mixing time is 10 hours, obtains coating material 1.11KG, and the particle diameter of coating material is 3 μm; The weight ratio of described carbon nanotube and organic carbon powder is 3:7;

[0033] 3) Fully stir 10KG of spherical graphite and 1.11KG of coating material in a stirring device for 1.5 hours, so that the coating material is evenly wrapped on the surface of spherical graphite; 10%;

[0034]4) The s...

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Abstract

The invention discloses a novel carbon-carbon nanotube lithium ion battery cathode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries and the nanometer technology field. The novel carbon-carbon nanotube lithium ion battery cathode material is characterized in that the novel carbon-carbon nanotube lithium ion battery cathode material is formed by spherical graphite and a cladding material wrapped on the surface of the spherical graphite, and the cladding material accounts for 8-12% of the total weight of the spherical graphite and the cladding material; and the cladding material is prepared through mixing carbon nanotubes with organic carbon powder, and the weight ratio of the carbon nanotubes to the organic carbon powder is 3:7. The novel carbon-carbon nanotube lithium ion battery cathode material prepared in the invention can well solve the carbon nanotube agglomeration phenomenon through multi-time grading diffusion, the cladding material is wrapped on the surface of the spherical graphite, and the carbon nanotubes generate a pompon-like grid structure on the surface of the spherical graphite, so the surface strength is enhanced, the conductive performance and the anti-damping performance are substantially improved, and the first discharge capacity is substantially improved.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a novel carbon-carbon nanotube lithium-ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries and the field of nanotechnology. Background technique [0002] Due to the important advantages of high voltage and high capacity, long cycle life and good safety performance, lithium-ion batteries have broad application prospects in the fields of portable electronic devices and electric vehicles. Spherical natural graphite has high lithium storage capacity, good voltage platform, and low price, and is one of the common negative electrode materials in the current market. However, spherical graphite is used as the negative electrode material of lithium-ion batteries. The SEI film formed during the charge-discharge process is prone to continuous collapse, which af...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 钱承亮
Owner YANGZHOU YET NEW ENERGY MATERIAL TECH
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