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A kind of PE diaphragm doped with nano-ceramic particles and preparation method thereof

A technology of nano-ceramic particles and separators, applied in structural parts, electrical components, battery pack parts, etc., can solve the problem of insufficient electrospinning technology theory, weak adhesion between ceramic particles and substrates, coating thickness and porosity Control the problems of unevenness, and achieve the effect of improving the affinity of electrolysis heat, not easy to drop powder and material, and good pore control effect.

Active Publication Date: 2019-09-13
广东卓高新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Inorganic ceramic materials have a high melting point, good electrolyte affinity, thermal stability and good electrochemical inertness. At present, research institutions and enterprises at home and abroad generally use spraying, impregnation, electrospinning technology, and wet coating Inorganic ceramic materials are coated on the surface of the diaphragm to improve the performance of the diaphragm, but the thickness and porosity of the coating prepared by spraying and dipping are not uniform, and the consistency of the diaphragm performance is poor; the theory of electrospinning technology is not perfect enough, and the production efficiency Low, no adhesion between fibers and low mechanical strength, difficult solvent recovery, environmental pollution, etc.
At the same time, these methods also have uneven coating, weak bonding between ceramic particles and the substrate, and easy powder and material drop.

Method used

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  • A kind of PE diaphragm doped with nano-ceramic particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 3g of aluminum isopropoxide with a particle size of ≤200nm and add it to 300g of absolute ethanol, stir until it is completely dissolved, soak the PE diaphragm in the solution for 15 seconds, and then place the PE diaphragm in an oven with a humidity of 70% to 80%. Set the temperature at 40° C. to 75° C. and bake for 50 minutes to 70 minutes to obtain a PE diaphragm doped with nano ceramic particles. Test the air permeability value of the PE diaphragm before and after immersion, the data are shown in Table 1.

Embodiment 2

[0022] Take 15g of aluminum isopropoxide with a particle size of ≤200nm and add it to 300g of absolute ethanol, stir until it is completely dissolved, soak the PE diaphragm in the solution for 15 seconds, and then place the PE diaphragm in an oven with a humidity of 70% to 80%. Set the temperature at 40° C. to 75° C. and bake for 50 minutes to 70 minutes to obtain a PE diaphragm doped with nano ceramic particles. Test the air permeability value of the PE diaphragm before and after immersion, the data are shown in Table 1.

Embodiment 3

[0024] Take 30g of aluminum isopropoxide with a particle size of ≤200nm and add it to 300g of absolute ethanol, stir until it is completely dissolved, soak the PE diaphragm in the solution for 15 seconds, and then place the PE diaphragm in an oven with a humidity of 70% to 80%. Set the temperature at 40° C. to 75° C. and bake for 50 minutes to 70 minutes to obtain a PE diaphragm doped with nano ceramic particles. Test the air permeability value of the PE diaphragm before and after immersion, the data are shown in Table 1.

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Abstract

The invention discloses a PE diaphragm doped with nano-ceramic particles and a preparation method thereof, comprising the following steps: a. adding isopropoxide, which is prone to hydrolysis reaction, into an alcoholic organic solvent according to a certain mass ratio, and stirring until completely dissolved , to obtain a nano-ceramic particle solution; b, soak the PE diaphragm into the nano-ceramic particle solution for a certain period of time; c, put the soaked PE diaphragm into an oven with a certain humidity and bake for a certain period of time to obtain the doped nano-ceramic particle PE diaphragm. The present invention enables isopropoxide to be hydrolyzed to form nano-scale ceramic particles attached to the PE diaphragm. Compared with the traditional spraying and dipping methods, the ceramic particles of the present invention are more evenly distributed, the pore control effect is better, and the diaphragm performance is consistent Moreover, the combination of the ceramic particles obtained in this way and the matrix is ​​stronger, which can maintain the long-term stability of the performance of the PE separator and improve the service life of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragm production, in particular to a PE diaphragm doped with nano-ceramic particles and a preparation method thereof. Background technique [0002] Lithium-ion batteries mainly include four key materials, namely positive electrode material, negative electrode material, diaphragm and electrolyte. When rising, the diaphragm blocks current conduction by closing the pores to prevent explosion; in addition, the diaphragm provides ion transport channels during charging and discharging. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects key characteristics such as battery capacity, cycle performance, charge and discharge current density, and safety performance. [0003] Inorganic ceramic materials have a high melting point, good electrolyte affinity, thermal stability and good electrochemical inertness. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/437H01M50/443
CPCH01M50/431H01M50/403H01M50/411Y02E60/10
Inventor 杨浩田王晓明王志彬韦程
Owner 广东卓高新材料科技有限公司