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Preparation method of safety coating for positive current collector in lithium ion battery

A technology for positive electrode current collectors and lithium-ion batteries, which is applied in electrode current collector coating, electrode manufacturing, battery electrodes, etc., to achieve the effects of improving rate performance, reducing internal resistance, and increasing contact probability

Active Publication Date: 2014-07-30
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will cause the direct scrapping of the lithium-ion battery, and thus indirectly increase the production cost of the lithium-ion battery

Method used

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  • Preparation method of safety coating for positive current collector in lithium ion battery
  • Preparation method of safety coating for positive current collector in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Put 200 grams of HDPE polyethylene in a high-speed universal pulverizer for crushing, then mix with 30 grams of carbon nanotubes evenly, and then add them to the torque rheometer for blending. The temperature of the torque rheometer is set at 160°C , the torque rheometer was set at 64r / min, the blending time of the torque rheometer was controlled at 10min, and the colloid was obtained by naturally cooling to room temperature. Add 300 grams of LA132 to the colloid and disperse evenly at high speed, then add about 1000 grams of double distilled water to adjust its viscosity, when the viscosity reaches 150mpas, a coating slurry is obtained, and the coating slurry is filtered through 0.5u Sieve through a sieve to get the primer. The primer was uniformly coated on the surface of the aluminum foil by gravure printing or spraying, and then dried at 85° C. for 12 hours, and finally a safety coating with a thickness of 2 μm was obtained on the surface of the aluminum foil.

Embodiment 2

[0036] Put 300 grams of HDPE polyethylene in a high-speed universal pulverizer for crushing, then mix with 45 grams of carbon nanotubes evenly, and then add them to the torque rheometer for blending. The temperature of the torque rheometer is set at 190°C , the torque rheometer was set at 60r / min, the blending time of the torque rheometer was controlled at 10min, and the colloid was obtained by naturally cooling to room temperature. Add 200 grams of LA132 to the colloid and disperse evenly at high speed, then add about 1000 grams of double distilled water to adjust its viscosity, when the viscosity reaches 100mpas, a coating slurry is obtained, and the coating slurry is filtered through 0.5u Sieve through a sieve to get the primer. The primer was uniformly coated on the surface of the aluminum foil by gravure printing or spraying, and then dried at 85° C. for 12 hours, and finally a safety coating with a thickness of 1 μm was obtained on the surface of the aluminum foil.

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Abstract

The invention provides a preparation method of a safety coating for a positive current collector in a lithium ion battery. The preparation method comprises the preparation of a colloid, the preparation of a safety paint and the application of the safety paint; an adopted high polymer base material serves as a framework and a filler carrier, and a conductive filler is capable of improving the electrical conductivity and the rate capability of the lithium ion battery in the effective range of usage temperatures. The preparation method is capable of increasing the contact area of active substances with the positive current collector at normal temperature, reducing the internal resistance and improving the rate capability, and also capable of sharply increasing the internal resistance of the positive current collector of the lithium ion battery and breaking network under the condition of thermal runaway, and therefore, the safety performance and the high-temperature stability of the lithium ion battery are improved and the safety problem of the lithium ion battery is solved from the source.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for preparing a safety coating for positive electrode collectors in lithium-ion batteries. Background technique: [0002] Since the advent of lithium-ion batteries, they have been widely used in portable electronic products, electric vehicles, energy storage, etc. field, and thus attracted the attention of the industry. [0003] The safety performance is the key factor affecting the performance of lithium-ion batteries. For lithium-ion batteries, the main safety problem of lithium-ion batteries is overcharging. At present, the methods to improve battery overcharging mainly include: [0004] Use an overcharged electrolyte as shown in CN201010237697.6, use a ceramic diaphragm as shown in CN200510132383.9, or add a positive temperature coefficient thermistor to the positive current collector as shown in CN200910204103.9, or add a positive tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/139
CPCH01M4/0404H01M4/139H01M4/668H01M10/0525Y02E60/10
Inventor 徐军红王进军
Owner LUOYANG YUEXING NEW ENERGY TECH
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