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Nano ceramic particle doped PE diaphragm and preparation method thereof

A technology of nano-ceramic particles and diaphragms, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of uneven control of coating thickness and porosity, imperfect theory of electrospinning technology, and bonding of ceramic particles and substrates Insufficiency and other problems, to achieve good pore control effect, improve electrolytic heat affinity, and not easy to drop powder and material

Active Publication Date: 2016-09-21
DONGGUAN ADVANCED ELECTRONICS TECH
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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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  • Nano ceramic particle doped PE diaphragm 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 nano ceramic particle doped PE diaphragm and a preparation method thereof. The method comprises the following steps: a, adding isopropoxide which easily occurs a hydrolysis reaction to an alcohol solvent according to a certain mass ratio and stirring till the isopropoxide is dissolved completely to obtain a nano ceramic particle solution; b, soaking a PE diaphragm in the nano ceramic particle solution for a certain time; and c, putting the soaked PE diaphragm into an oven with a certain humidity and baking for a certain time to obtain the nano ceramic particle doped PE diaphragm. According to the nano ceramic particle doped PE diaphragm and the preparation method thereof disclosed by the invention, the isopropoxide after being hydrolyzed forms nano ceramic particles attached on the PE diaphragm. Compared with the traditional spraying-brushing, and dipping methods, the ceramic particle distribution of the method is more uniform, the pore control effect is better, the consistency of diaphragm performance is higher, and the electrolysis heat affinity of the diaphragm is improved; and meanwhile, the binding of the ceramic particles obtained in the method with a matrix is firmer, the long-term stability of the performance of the PE diaphragm can be maintained, and the service life of a lithium ion battery is improved.

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 Applications(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 DONGGUAN ADVANCED ELECTRONICS TECH