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Preparation method for fiber film and production of fiber film

A fiber membrane and composite fiber membrane technology, applied in the field of fiber membranes, can solve the problems of weakened mechanical properties, poor adhesion between inorganic coatings and porous membranes, uneven thickness, etc., achieve high mechanical properties and safety, and improve kinetics Performance, Ease of Diffusion and Penetration

Active Publication Date: 2017-05-10
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people use inorganic nano oxides to modify the nanofiber separator, such as inorganic coating, mixed spinning, etc., but the inorganic coating method adds a complicated modification process, and the adhesion between the inorganic coating and the porous membrane layer is poor. , The shedding of coating particles will also affect the performance and stability of the separator, while organic-inorganic hybrid spinning has problems such as poor heterogeneous dispersion, long mixing time of suspended spinning solution, low efficiency, uneven thickness, agglomeration and plugging, etc. , leading to a serious weakening of the mechanical properties

Method used

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  • Preparation method for fiber film and production of fiber film
  • Preparation method for fiber film and production of fiber film
  • Preparation method for fiber film and production of fiber film

Examples

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preparation example Construction

[0032] The application relates to a method for preparing a fiber membrane, at least including the following steps:

[0033] (1) Mixing inorganic particle precursors, organic polymers and organic solvents to make spinning liquid, and preparing fiber membrane intermediates by electrospinning process;

[0034] (2) reacting the intermediate fiber membrane with an alkali to form an organic-inorganic particle composite fiber membrane to obtain the fiber membrane.

[0035] In this application, the inorganic particle precursor refers to the existing form of the inorganic particle before reacting with the base, which includes all material forms that can be reacted with the base to obtain the inorganic particle compound, such as acids, salts or ester compounds. As an improvement of the preparation method of the present application, the inorganic particle precursor can be selected from liquid soluble organic ester compounds; preferably, the structural formula of the inorganic particle pr...

Embodiment 1

[0057] 1. Mix the inorganic particle precursor, organic polymer and organic solvent in proportion, stir for 30 minutes to obtain a homogeneous solution as a spinning solution, prepare the intermediate nanofiber membrane by electrospinning, and control the diameter of the fiber in the nanofiber membrane 200~600nm;

[0058] 2. The intermediate nanofiber membrane is soaked in an alkaline solution, taken out, washed with water, and then dried in an oven to obtain an organic-inorganic composite nanofiber membrane. The specific parameters are described in Table 1.

[0059] Table 1

[0060]

experiment example

[0068] The performance of the organic-inorganic composite nanofibrous membrane prepared by the above-mentioned examples and comparative examples is detected, wherein:

[0069] 1. Gas permeability (s / 100cc): Gas permeability tester is used to test with reference to the standard "GB / T1038-2000 Plastic Film and Sheet Gas Permeability Test Method Pressure Difference Method".

[0070] 2. Porosity (%): A mercury porosimeter is used for detection, specifically: the sample is dried and weighed, and the pore size distribution curve and pore volume parameters are obtained according to the volume of mercury pressed into the pores under different pressures.

[0071] 3. Longitudinal tensile strength (N): Use a multifunctional electronic tensile machine to test with reference to the standard "GB / T16491-1996 Electronic Universal Testing Machine". For the sample, install the corresponding tension fixture, input the length, width and thickness of the sample, measure the maximum plastic deforma...

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Abstract

The invention relates to the field of a fiber film, in particular to a preparation method of a fiber film and a product of the fiber film. The preparation method comprises the steps of mixing an inorganic particle precursor, an organic polymer and an organic solvent to prepare a spinning solution, and preparing to obtain a fiber film intermediate body by an electrostatic spinning process; and enabling the intermediate fiber film to react with an alkali to form an organic-inorganic particle composite fiber film. According to the preparation method, the inorganic particle precursor is selected to form a homogeneous-phase spinning solution, the inorganic particle formed after reaction is nanocrystallized, and the nanometer inorganic particle is tightly embedded and combined with the polymer and is uniformly combined and distributed in a polymer fiber substrate. With the preparation method disclosed by the invention, the mechanical strength of the fiber film is improved, a porous structure in the fiber film is improved, and the dynamic performance of a lithium battery can be improved.

Description

technical field [0001] The present application relates to the field of fiber membranes, in particular, to a method for preparing fiber membranes and products thereof. Background technique [0002] As one of the most important components of a lithium-ion battery, the separator prevents the positive and negative electrodes from contacting to prevent short circuit and allows lithium ions to pass through freely so that the battery conducts electricity. Therefore, the quality of the separator directly affects the electrical performance of the lithium-ion battery and safety. The currently widely used separator materials for lithium batteries are mainly microporous olefin membranes. At present, polyethylene / polypropylene microporous films are stretched by dry or wet methods to obtain microporous membranes. The dry process is difficult to control the pore size and distribution, and the mechanical strength is poor, while the wet process is complicated, high in cost, and will cause p...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M50/403H01M50/411H01M50/431H01M50/44Y02E60/10Y02P70/50
Inventor 江静曾巧王可飞
Owner NINGDE AMPEREX TECH
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