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Composite cathode material of lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, applied in the field of nanomaterials and chemical power sources, can solve the problem of reducing the first cycle efficiency and cycle stability of negative electrode materials, high power characteristics of negative electrode materials and poor rapid charge and discharge capabilities, uniform distribution and dense The degree can not be effectively controlled and other problems, to achieve the effect of improving distribution uniformity and density, improving high-power characteristics, and facilitating popularization and application

Active Publication Date: 2009-09-23
SHENZHEN XIANGFENGHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the distribution uniformity and denseness of the carbon nanofibers or carbon nanotubes prepared by the invention on the surface of the negative electrode material cannot be effectively controlled. The first cycle efficiency and cycle stability of the negative electrode material are reduced; in addition, the carbon nanofiber or carbon nanotube prepared by this invention has low degree of graphitization and poor conductivity, resulting in poor high power characteristics and rapid charge and discharge capability of the negative electrode material And other issues

Method used

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  • Composite cathode material of lithium ion battery and preparation method thereof
  • Composite cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Components and mass percentages thereof of a lithium-ion battery negative electrode composite material are:

[0032] Negative electrode material 90wt.%

[0033] Carbon Nanofiber 10wt%

[0034] Wherein: the negative electrode material is spherical natural graphite with an average particle size of 20 microns.

[0035] The concrete steps of a kind of preparation method of negative electrode composite material of lithium ion battery are as follows:

[0036] (1) Prepare the mixed solution of negative electrode material and catalyst

[0037] According to negative electrode material spherical natural graphite: the mass ratio of catalyst nickel nitrate is the ratio of 100:0.1, and the average particle diameter of spherical natural graphite is 20 microns, and spherical natural graphite and nickel nitrate are mixed and added in the water solvent and mixed and stirred evenly to prepare into a mixed solution with a concentration of 0.01g / ml;

[0038](2) Remove the solvent

[0...

Embodiment 2

[0043] Components and mass percentages thereof of a lithium-ion battery negative electrode composite material are:

[0044] Carbon anode material 95wt.%

[0045] Multi-walled carbon nanotubes 5wt%

[0046] Wherein: the carbon negative electrode material is graphitized mesophase carbon microspheres with an average particle size of 15 microns.

[0047] The concrete steps of a kind of preparation method of negative electrode composite material of lithium ion battery are as follows:

[0048] (1) Prepare the mixed solution of negative electrode material and catalyst

[0049] With embodiment 1, feature is: negative electrode material graphitization mesophase carbon microsphere: the mass ratio of catalyst ferrocene is 100: 1, and the average particle diameter of graphitization mesophase carbon microsphere is 15 microns, and graphitization mesophase Carbon microspheres and ferrocene are mixed in acetone solvent to prepare a mixed solution with a concentration of 1g / ml;

[0050] (2...

Embodiment 3

[0055] Components and mass percentages thereof of a lithium-ion battery negative electrode composite material are:

[0056] Negative material 85wt.%

[0057] SWNT 15wt%

[0058] Among them, the negative electrode material is LiTi 2 o 4 , with an average particle size of 0.1 microns.

[0059] The concrete steps of a kind of preparation method of negative electrode composite material of lithium ion battery are as follows:

[0060] (1), prepare the mixed solution of negative electrode material and catalyst

[0061] With embodiment 1, feature is: LiTi 2 o 4 : The mass ratio of catalyst ferrocene is 100:10, LiTi 2 o 4 The average particle size of LiTi is 0.1 μm, and the LiTi 2 o 4 Mix with ferrocene in solvent acetone to make a mixed solution with a concentration of 5g / ml;

[0062] (2), remove the solvent

[0063] With embodiment 2;

[0064] (3), chemical vapor deposition

[0065] Same as embodiment 1, the feature is: first pass into high-purity helium, after the temp...

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Abstract

The invention discloses a composite cathode material of a lithium ion battery and a preparation method thereof, and pertains to the technical field of nano-materials and chemical power source. The material is a composite of cathode material and a carbon nanotube or carbon nanofiber; the method of the invention comprises the step of adopting a chemical vapor deposition process for the in-situ growth of the carbon nanotube or the carbon nanofiber on the surface of the cathode material; the invention has simple process, energy conservation and consumption reduction and low production cost; and the composite cathode material is prepared by the steps that the carbon nanotube or the carbon nanofiber are directly erected on the surface of the cathode material to form a sea urchin type structure, and the carbon nanotube or the carbon nanofiber has good distribution uniformity, concentration degree and crystallinity on the surface of the cathode material; and the invention is characterized by high conductivity, high capacity, capability of rapid charge and discharge and the like in performance. The materials prepared by adopting the method of the invention can be widely applied in the new energy devices including lithium ion batteries, supercapacitors and the like, and can also be applied to catalyst carrier, absorbing materials, conductive materials and heat conducting materials and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and chemical power sources, and in particular relates to a negative electrode composite material of a lithium ion battery and a preparation method thereof. Background technique [0002] According to market forecasts in Japan, the United States and Europe, lithium-ion battery packs will be the main batteries used in vehicles after 2010, but the high-power characteristics and safety issues of lithium-ion batteries have yet to be resolved. In view of the development requirements of lithium-ion power batteries, the anode material is objectively required to have the characteristics of high capacity, fast charge and discharge rate, high thermal stability and low cost. [0003] At present, the negative electrode materials with more practical applications include carbon materials, such as natural graphite, graphitized mesocarbon microspheres (MCMB), pitch coke, etc.; there are also non-carbon ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/36H01M4/62H01M4/38H01M4/48H01M4/04
CPCY02E60/12Y02E60/10
Inventor 李新禄杜坤黄佳木
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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