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Graphite negative electrode material of lithium ion battery and preparation method for graphite negative electrode material

A lithium-ion battery, graphite anode technology, applied in battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of electrolyte absorption capacity, rate performance Coulomb efficiency difficult to achieve application goals, etc., and achieve excellent Coulomb efficiency and cycle life. , The effect of high rate charge and discharge performance improvement and ability improvement

Active Publication Date: 2017-03-22
NINGDE AMPEREX TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, surface carbon coating is the most commonly used method, mainly including solid-phase method, liquid-phase method and chemical vapor deposition method, most of which are amorphous carbon coated on the graphite surface, but even after the above treatment, when the graphite negative After the cloth weight and compaction density increase, its electrolyte absorption capacity, rate performance and coulombic efficiency in the cycle process are still difficult to meet the application goals

Method used

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  • Graphite negative electrode material of lithium ion battery and preparation method for graphite negative electrode material

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Embodiment 1

[0030] Preparation of graphite negative electrode material:

[0031] 1) Disperse the carbon nanotubes in deionized water containing 1% by mass of the surfactant hexadecyltrimethylammonium bromide (HTAB), and ultrasonically treat them for 80 minutes to uniformly disperse the carbon nanotubes in the dispersant , the mass percentage of carbon nanotubes in the dispersion is 3%, that is, the required carbon nanotube dispersion is obtained;

[0032] 2) Uniformly mix 20kg of graphite with 0.8kg of the carbon nanotube dispersion obtained in step 1) by kneading and stirring, so that the carbon nanotubes are evenly coated on the graphite surface; then add 16kg of deionized water and stir evenly; control the temperature at 85°C , keep stirring until the deionized water evaporates to dryness;

[0033] 3) vacuum drying the mixture obtained in step 2) at a temperature of 95°C;

[0034] 4) The mixture obtained in step 3) is compacted, calcined at a high temperature of 430° C. for 6 hours, ...

Embodiment 2

[0040] This embodiment adopts the same method as Example 1 to prepare graphite negative electrode material and lithium ion battery, the difference is that the second step of graphite negative electrode material preparation is as follows:

[0041] 2) Uniformly mix 20kg of graphite with 2kg of the carbon nanotube dispersion obtained in step 1) by kneading and stirring, so that the carbon nanotubes are uniformly coated on the graphite surface; then add 15kg of deionized water and stir evenly; control the temperature at 85°C, Keep stirring until the deionized water evaporates to dryness.

[0042] Therefore, in the finally obtained graphite negative electrode material uniformly coated with carbon nanotubes, the mass percentage of carbon nanotubes is 0.3%.

Embodiment 3

[0044] This embodiment adopts the same method as Example 1 to prepare graphite negative electrode material and lithium ion battery, the difference is that the second step of graphite negative electrode material preparation is as follows:

[0045]2) Uniformly mix 20kg of graphite with 5kg of the carbon nanotube dispersion obtained in step 1) by kneading and stirring, so that the carbon nanotubes are uniformly coated on the graphite surface; then add 12kg of ethanol and stir evenly; control the temperature at 85°C and keep stirring until the deionized water evaporates to dryness.

[0046] Therefore, in the finally obtained graphite negative electrode material uniformly coated with carbon nanotubes, the mass percentage of carbon nanotubes is 0.7%.

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Abstract

The invention discloses a graphite negative electrode material of a lithium ion battery and a preparation method for the graphite negative electrode material. The graphite negative electrode material of the lithium ion battery comprises graphite and carbon nanotubes which uniformly coat the surface of the graphite through a physical coating method; and the carbon nanotubes form a network-shaped structure in the graphite negative electrode material. The preparation method comprises the following steps of 1) preparing a carbon nanotube dispersion solution; 2) coating the graphite with the carbon nanotubes; 3) drying a dispersing agent; and 4) performing carbonization on the dispersing agent and a surfactant. Compared with the prior art, the graphite is coated with the carbon nanotubes in the preparation method, so that the electrolyte absorption capability, the rate capability and the cycling life of the graphite negative electrode material can be effectively improved and prolonged.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a lithium-ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently the most advanced commercial secondary batteries in the world, but the development of electronic technology has put forward higher requirements for lithium-ion batteries: higher energy density, higher power density and better cycle life, This requires that the materials of lithium-ion batteries need to be further developed and improved. Therefore, anode materials for lithium-ion batteries have always been a focus of research. [0003] Graphite has become the most widely used negative electrode material in lithium-ion batteries due to its advantages such as abundant resources, low price, low charge and discharge voltage platform, and good safety. However, with the development of technolog...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/362H01M4/583H01M2004/027Y02E60/10
Inventor 莫明亮钟松材
Owner NINGDE AMPEREX TECH
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