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Method for preparing inorganic/organic composite porous lithium battery diaphragm

A lithium battery separator and organic technology, which is applied in the field of preparation of inorganic/organic composite porous lithium battery separators, can solve the problems of low porosity, affect ion conductivity, take a long time, etc., achieve stable storage, improve ion conductivity, fast dispersing effect

Inactive Publication Date: 2011-10-19
廖勇勤
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Problems solved by technology

However, the existing method of dispersing inorganic particles in the binder polymer solution is mainly ball milling. This method not only takes a long time (such as more than 10 hours), but also has poor dispersion effect and serious particle aggregation when the inorganic particle content exceeds 60wt%. , resulting in uneven pore size and low porosity (not exceeding 40%), which seriously affects the ion conductivity

Method used

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Embodiment Construction

[0011] a. BaTiO with a particle size of 0.001-10 microns 3 , SnO 2 、Al 2 o 3 、TiO 2 , ZnO, CaO, CeO 2 , lithium phosphate, lithium titanium phosphate or lithium titanium aluminum phosphate and other inorganic particles are added in the binder polymer solution, the content of inorganic particles in the binder polymer solution is 60~95wt%, the binder polymer solution can be It is a solution composed of polyimide, polyvinylidene fluoride, cellulose acetate, polyvinyl acetate, polyacrylonitrile and polyvinylpyrrolidone, etc. and low boiling point solvents with similar solubility parameters;

[0012] b. Use ultrasonic equipment, select ultrasonic waves with a frequency of 20-130KHz and a power of 100-1500W to act on the binder polymer solution added with inorganic particles, and the action time is to make the inorganic particles evenly dispersed in the binder polymer solution ;

[0013] c. Coat the binder polymer solution dispersed with inorganic particles on a porous polymer...

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Abstract

The invention discloses a method for preparing inorganic / organic composite porous lithium battery diaphragms by using inorganic particles with high dispersion speed, excellent effect, uniform aperture and high porosity. The method comprises the following steps of: adding the inorganic particles with particle diameter of 0.001 to 10 mu m into an adhesive polymer solution, wherein the content of the inorganic particles is 60 to 95 weight percent based on the weight of the adhesive polymer solution; using ultrasonic wave with frequency of 20-130 KHz and power of 100-1,500 W to act on the adhesive polymer solution added with the inorganic particles so as to uniformly disperse the inorganic particles; and coating the adhesive polymer solution dispersed with the inorganic particles on a porous polymer base material, and drying to obtain the inorganic / organic composite porous lithium battery diaphragms.

Description

technical field [0001] The invention relates to a preparation method of an inorganic / organic composite porous lithium battery diaphragm, in particular to a preparation method of an inorganic / organic composite porous lithium battery diaphragm with rapid dispersion of inorganic particles, good effect, uniform pore size and high porosity. Background technique [0002] With the increasing output of lithium batteries year by year, separators are one of the core components of lithium batteries, and their market demand is also increasing day by day. At present, commercialized lithium ion battery separators are mainly polyolefin microporous membranes and inorganic / organic composite porous membranes. [0003] Polyolefin microporous membranes mainly include polypropylene (PP), polyethylene (PE) single-layer microporous membranes, and multi-layer microporous membranes composed of polypropylene (PP) and polyethylene (PE). Polyolefin microporous membrane has the characteristics of excell...

Claims

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Application Information

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IPC IPC(8): H01M2/14
CPCY02E60/10
Inventor 廖勇勤
Owner 廖勇勤
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