Method for preparing nanometer ceramic particle doped PE diaphragm

Abstract

The invention provides a method for preparing a nanometer ceramic particle doped PE diaphragm, belonging to the technical field of high-property membrane materials. The method for preparing the nanometer ceramic particle doped PE diaphragm comprises the steps of proportioning materials, extruding cast strips, synchronously drawing towards two directions, extracting, transversely stretching for enlarging and the like; as electrochemical inactive inorganic ceramic particles are added in a skeleton material of the PE diaphragm, the PE diaphragm has better compatibility with the electrodes of a lithium ion battery than the common battery diaphragm, the high-temperature resistance and the safety of the battery can be greatly improved, the absorbability of liquid electrolytes is good, the electrolyte filling time of the battery can be shortened,the internal resistance of the battery can be reduced, and the high-rate charging-discharging properties of the batteries can be improved, so that the charging-discharging cycle properties of the battery can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of high-performance membrane materials, and in particular relates to a preparation method of a PE diaphragm doped with nano ceramic particles. Background technique [0002] At present, most countries are facing the dual pressure of lack of non-renewable energy and environmental pollution, and the development of new energy is an important way to save energy and reduce emissions. Lithium-ion batteries have the characteristics of small size, light weight, high working voltage, high energy, long cycle life and low pollution, and are ideal energy sources for future development. [0003] Lithium-ion batteries have become the mainstream development direction of secondary batteries due to their excellent performance. Lithium-ion batteries mainly include four key materials, namely positive electrode material, negative electrode material, diaphragm and electrolyte. When rising, the diaphragm blocks current conductio...

AI Technical Summary

Problems solved by technology

[0005] 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 and electrospinning methods to make inorganic ceramics The material is coated on the surface of the separator to improve the performance of the separator, but the spraying and dipping methods need to use a large amount of organic solvents, and the thickness and porosity of the prepared coating are not uniformly controlled, and the performance of the separator is poor; the theory of electrospinning technology is not enough Improvement, low production efficiency, non-adhesion between fibers and low mechanical strength, solvent recovery, environmental pollution, etc.

At the same time, these methods also have uneven coating, weak bonding between inorganic nano-ceramic particles and the substrate, and easy powder and material drop.

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