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Modified current collector with nano graphite coating

A technology of nano-graphite and current collectors, which is applied in the direction of electrode carriers/collectors, etc., can solve the problems of poor electrical conductivity of conductive carbon black, difficult production, high cost of graphene, etc., and achieve low cost, good thermal conductivity, and reduced interface impedance. Effect

Inactive Publication Date: 2013-08-28
王梁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cost of graphene is high and production is difficult; while conductive carbon black has poor conductivity

Method used

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  • Modified current collector with nano graphite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 1 part by weight of polyvinylidene fluoride and 1000 parts by weight of organic solvent N-methylpyrrolidone, and mix them for 10 minutes under a high-speed dispersion device. After the polyvinylidene fluoride is completely dissolved, add 20 parts by weight of nano-graphite powder (microscopic appearance It is planar, with an average thickness of 7nm, an average plane size of 10 microns, a carbon content of 97%, and oxidized groups), stirred in a vacuum mixer for 200 minutes to make a slurry, and used a slot-type continuous coating machine to coat the slurry Coated on a 16-micron aluminum foil, dried in an oven at 110°C, and then dried in a vacuum oven at 100°C for 2 hours to obtain a nano-graphite-coated modified current collector with a coating thickness of 0.2 microns on one side, double-sided coating Such as figure 1 shown.

[0049] The four-probe test shows that the resistivity of the modified current collector is 1.5×10 -6 Ω·cm.

[0050] The 18650-type lith...

Embodiment 2

[0053] Take 1 weight part of polyvinylidene fluoride and 500 weight parts of organic solvent N-methylpyrrolidone, and mix them under a high-speed dispersion device for 20 minutes. After the polyvinylidene fluoride is completely dissolved, add 20 weight parts of nano-graphite powder (microscopic appearance It is planar, with an average thickness of 3nm, an average plane size of 9 microns, a carbon content of 97%, and oxidized groups), stirred in a vacuum mixer for 200 minutes to make a slurry, and used a micro-groove continuous coating machine to coat the slurry Coated on a 16-micron aluminum foil, dried in an oven at 110°C, and dried in a vacuum oven at 100°C for 2 hours to obtain a nano-graphite-coated modified current collector with a coating thickness of 0.3 microns on one side, double-sided coating .

[0054] The four-probe test shows that the resistivity of the modified current collector is 1.2×10 -6 Ω·cm.

[0055] The 18650-type lithium iron phosphate lithium battery m...

Embodiment 3

[0058] Take 1 part by weight of polyvinylidene fluoride and 500 parts by weight of organic solvent N-methylpyrrolidone, and mix them for 20 minutes under a high-speed dispersion device. After the polyvinylidene fluoride is completely dissolved, add 15 parts by weight of nano-graphite powder (microscopic appearance It is planar, with an average thickness of 5nm, an average plane size of 9.2 microns, a carbon content of 98%, and carboxyl groups), and after stirring in a vacuum mixer for 20 minutes, add 5 parts by weight of expanded graphite powder and 1 part by weight of carbon nanotubes , stir in a vacuum mixer for 200 minutes to make a slurry, use a dimple continuous coater to coat the slurry on a 16-micron aluminum foil, dry it in a 110°C oven, and then dry it in a 100°C vacuum oven for 2 hours , to obtain a nano-graphite-coated modified current collector with a coating thickness of 0.2 microns on one side, and double-sided coating.

[0059] The four-probe test shows that the...

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Abstract

The invention relates to the technical field of materials for li-ion batteries. The invention discloses a modified current collector with nano graphite coating including foils of a current collector. The foil of a current collector has a coating containing nano graphite on a single side or both sides. Nano graphite is applied in the invention as a main functional material of the coating. The characteristics of highly-graphitized graphite are reserved by the nano graphite material.The electric conductivity and heat conductivity of the nano graphite material are excellent. Meanwhile, dispersity and coating effect or the like of a graphite material can be improved because of the nanocrystallization characteristic. The material can be used as a coating material. In addition, the cost of nano graphite material is lower than that of graphene, so the material is applicable to industrial promotion. The nano graphite material can decrease the interface impedance between a current collection and an active material, reduce internal resistance of batteries and improve the cycle life and rata capacity of batteries when being used in lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a nano-graphite-coated modified current collector. Background technique [0002] With the depletion of traditional fossil energy and the increasing emphasis on environmental protection, people's demand for new green and efficient energy is increasingly urgent. As a new energy source with a strong competitive advantage, lithium-ion batteries have received special attention. In addition to their wide application in existing small portable batteries, the development prospects of lithium-ion batteries in high-power and high-energy power batteries are even more impressive. In addition, energy storage batteries have higher requirements for life and safety performance. [0003] Existing lithium batteries have major problems in terms of power, safety performance, and life. In order to solve the above problems, researchers have tried to improve them in the following...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCY02E60/10
Inventor 王樑
Owner 王梁
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