Preparation method for ion battery porous diaphragm and ion battery

A porous separator and ion battery technology, applied in the field of membrane materials, can solve the problems of expensive solvents, high prices, and non-recyclability

Inactive Publication Date: 2019-05-21
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously used pore-forming agents have a narrow range of options, are expensive, cannot be recycled, and use expensive solvents

Method used

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  • Preparation method for ion battery porous diaphragm and ion battery
  • Preparation method for ion battery porous diaphragm and ion battery
  • Preparation method for ion battery porous diaphragm and ion battery

Examples

Experimental program
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preparation example Construction

[0029] The invention provides a method for preparing a battery porous diaphragm, which is characterized in that it comprises the following steps:

[0030] a), disperse the polymer and the pore-forming agent in solvent I to obtain a solution containing the complex; the polymer is selected from polyvinylidene fluoride and / or polyvinylidene fluoride-hexafluoropropylene copolymer and polyvinylidene fluoride One or more of aramid fibers; the pore-forming agent is selected from alkali metal salts; the total mass of the polymer and the pore-forming agent accounts for 1-40% of the solution, and the molar ratio of the pore-forming agent to the polymer is 0.05- 5:1; the solvent I is selected from N-methylpyrrolidone, dimethylacetamide, dimethylformamide, acetone, triethyl phosphate, hexamethylphosphoramide, diethylformamide, tetramethyl One or more of urea, sulfolane and dimethyl sulfoxide;

[0031] b), coating the solution containing the complex on the substrate, and drying to obtain ...

Embodiment 1

[0052] see figure 1 , figure 1 It is the preparation flowchart of Example 1 of the present invention;

[0053] 10g PVDF, 2g LiTFSI and 0.2g nano-Al 2 o 3 Dissolve in 20g of NMP, stir at 40°C for 5 hours, scrape the liquid on a glass plate with a thickness of 450μm, and place it in a blast oven at 45°C. After 10 hours, the membrane was removed from the glass plate, soaked in alcohol and washed three times, and the washed LiTFSI could be dried and recycled. Place the membrane in a vacuum oven at 60° C. for 20 hours to obtain a porous diaphragm with a thickness of 32 μm, a porosity of 50%, and an average pore diameter of 55 nm.

[0054] figure 2 SEM image of the porous membrane prepared in Example 1 of the present invention. image 3 It is the SEM picture of the commercial PP film. From figure 2 and image 3 It can be seen from the comparison that the pore diameter distribution of the porous diaphragm prepared in Example 1 of the present invention is uniform, and all a...

Embodiment 2

[0058] 15g PVDF, 1.5g LiPF 6 Dissolve in 40 g of dimethyl sulfoxide, stir at 45°C for 8 hours, scrape the liquid on a glass plate with a thickness of 750 μm, and place it in a blast oven at 70°C. After 12 hours, the membrane was removed from the glass plate, soaked in dimethyl carbonate and washed three times to remove the LiPF 6 Can be recycled. The membrane was placed in a vacuum oven at 75° C. for 20 hours to obtain a porous diaphragm with a thickness of 28 μm, a porosity of 56%, and an average pore diameter of 62 nm.

[0059] Figure 4 SEM image of the porous membrane prepared in Example 2 of the present invention.

[0060] The present invention tests the tensile strength of the porous diaphragm, and the test results are: the transverse tensile strength of the porous diaphragm prepared in Example 2 is 408 MPa, and the longitudinal tensile strength is 106 MPa.

[0061] With NCA as the positive electrode, metal Li as the negative electrode, and LiPF 6(EC:DMC=1:1) is the...

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Abstract

The invention provides a preparation method for ion battery porous diaphragm and an ion battery. The method comprises the steps of dispersing a polymer and a pore former into a solvent I, thereby obtaining the solution containing complex, wherein the polymer is selected from one or more of polyvinylidene fluoride, poly(vinylidene fluoride-hexaflouropropylene)copolymer and polyaramid, the pore former is selected from alkali metal salt, total mass of the polymer and the pore former occupies 1-40% of the solution, a molar ratio of the pore former and the polymer is 0.05-5:1, and the solvent I isselected from at least one of N-Methyl pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, acetone, triethyl phosphate, hexamethylphosphoramide, tetramethylurea, sulfolane and dimethyl sulfoxide; coating the solution and carrying out drying to obtain initial diaphragm, washing the initial diaphragm through utilization of a solvent which cannot dissolve the polymer, and carrying out drying. The method is simple. Thickness, a pore size and porosity of the porous diaphragm can be adjusted. Mechanical strength can be controlled. Mechanical strength is relatively high. Relatively high charge/discharge performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a method for preparing a porous diaphragm of an ion battery and the ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long life, no memory effect, and low price. They are widely used in new power sources such as energy storage, aerospace, portable consumer electronics, and electric vehicles. Sodium-ion batteries have the characteristics of abundant raw material reserves, low cost, high rate, and no over-discharge, and have been applied in large-scale energy storage and low-speed electric vehicles. [0003] At present, commercial separators in lithium-ion batteries (or sodium-ion batteries) are mainly PP, PE or PP / PE / PP three-layer composite films, which are generally prepared by stretching or extrusion methods, with good stability and mechanical strength. High, uniform pore size. However, the abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/0525H01M10/054H01M50/403H01M50/426H01M50/491
CPCY02E60/10
Inventor 杨琪黄杰王亚飞张美钰俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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