Porous lithium ion battery separator with interpenetrating polymer network structure, and preparation method and application for porous lithium ion battery separator

An interpenetrating network structure, lithium-ion battery technology, applied in the direction of batteries, secondary batteries, structural parts, etc., to achieve good compatibility, improve thermal stability, and ensure the effect of ion conductivity

Active Publication Date: 2016-09-07
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology cannot satisfy the above requirements well. Therefore, it is necessary to find a better interpenetrating network structure and cross-linking method to obtain a polymer interpenetrating network structure to enhance the strength of the polymer separator to meet the requirements of lithium-ion batteries. Application requirements

Method used

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  • Porous lithium ion battery separator with interpenetrating polymer network structure, and preparation method and application for porous lithium ion battery separator
  • Porous lithium ion battery separator with interpenetrating polymer network structure, and preparation method and application for porous lithium ion battery separator
  • Porous lithium ion battery separator with interpenetrating polymer network structure, and preparation method and application for porous lithium ion battery separator

Examples

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Embodiment 1

[0047] Example 1: Preparation of a porous lithium-ion battery separator with an interpenetrating network structure using PEG400 as a porogen

[0048] 1.2 g PVDF-HFP and 0.105 g OV-POSS were weighed, put into a mixed solvent of 4.5 g DMF and 3 g THF, and stirred at room temperature for 2 h to form a homogeneous solution. Add 0.8 g PEGMEMA, according to the theoretical mass of PEG400 accounted for the gel film, add PEG400, continue to stir for 1 h. Finally, 0.010 g DMPA was added and stirred for 10 min until it was completely dissolved. After standing for defoaming, use an adjustable film applicator to evenly coat the solution on a clean and flat polyethylene plate; finally, place the polyethylene plate coated with the solution under an ultraviolet lamp to initiate polymerization, and place it in a 70°C refrigerator after the end. Dry in a vacuum oven for 18 h to remove the solvent. The diaphragm was taken out and soaked in deionized water at 60°C for 40 h to wash away the por...

Embodiment 2

[0049] Example 2: Preparation of a porous lithium-ion battery separator with an interpenetrating network structure using PVP as a porogen

[0050]Preparation of porous lithium-ion battery separator with interpenetrating network structure: 1.2 g PVDF-HFP and 0.105 g POSS were weighed, dissolved in 4.5 g DMF and 3 g THF, and stirred at room temperature for 2 h to form a uniform solution. Add 0.8 g PEGMEMA, according to the theoretical mass of PVP in the gel film, add PVP, continue stirring for 1 h, finally add 0.020 g DMPA, stir for 10 min until completely dissolved. After standing for defoaming, use an adjustable film applicator to evenly coat the solution on a clean and flat polyethylene plate; finally put the solution-coated polyethylene plate under a UV lamp to initiate polymerization. The diaphragm was taken out and soaked in deionized water at 50°C for 48 h to wash away the porogen and unreacted monomers. Finally, dry in a vacuum oven at 60°C for 24 h to obtain porous lit...

Embodiment 3

[0051] Example 3: Preparation of a porous lithium-ion battery separator with an interpenetrating network structure using lithium chloride inorganic salt as a porogen

[0052] Preparation of porous lithium-ion battery separator with interpenetrating network structure: weigh 1.2 g PVDF-HFP, 0.105 g POSS, dissolve in 4.5 g DMF and 3 g THF, stir at room temperature for 2 h until completely dissolved, then add 0.8 g PEGMEMA, according to the theoretical mass of inorganic salts in the gel film, add lithium chloride, continue stirring for 1 h, and finally add 0.030 g DMPA, stir for 10 min until completely dissolved. After standing for defoaming, use an adjustable film applicator to evenly coat the solution on a clean and flat polyethylene plate; finally put the solution-coated polyethylene plate under a UV lamp to initiate polymerization. The diaphragm was taken out and soaked in deionized water at 60°C for 40 h to wash away the porogen and unreacted monomers. Finally, put it in a v...

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Abstract

The invention discloses a porous lithium ion battery separator with an interpenetrating polymer network structure, and a preparation method and an application for the porous lithium ion battery separator. The preparation method specifically comprises the steps of uniformly mixing polyvinylidene fluoride-hexafluoropropylene, (methyl) acrylate monomers, octavinyl octa-silsesquioxane cross-linking agent and pore-forming auxiliary in a proper solvent to form porous gel polymer film with the interpenetrating polymer network structure through free radical polymerization, wherein the ion conductivity of the polymer film at a temperature of 25 DEG C can reach 1.0*10<-3>S / cm, the tensile strength can reach 7MPa, and excellent dimensional stability is realized; and on the basis, carrying out post processing on the gel polymer film to obtain the porous separator. By adoption of the lithium ion battery separator provided by the invention, the ionic conductivity can be greatly improved, and the high rate charging-discharging performance can be also obviously enhanced as well, so that the porous lithium ion battery separator is high in application potential.

Description

technical field [0001] The invention belongs to the technical field of battery separator materials, and in particular relates to a porous lithium-ion battery separator with an interpenetrating network structure and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries refer to the lithium ions (Li + ) A rechargeable and dischargeable high-performance battery that embeds and escapes positive and negative electrode materials. It has the characteristics of high energy density, high working voltage, and no memory effect. It is widely used in mobile phones, laptops and other digital products and large energy storage devices. middle. Lithium-ion battery separator (referred to as "separator") is an important part of the cost second only to the positive and negative electrode materials. It plays an important role in isolating the positive and negative electrodes in the battery and promoting ion conduction as an electrolyte carrier. The s...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525C08F259/08C08F220/28H01M50/403H01M50/417H01M50/491H01M50/494H01M50/497
CPCH01M10/0525C08F259/08H01M2220/30H01M50/409H01M50/403H01M50/411C08F220/286Y02E60/10
Inventor 张明祖胡健康何金林倪沛红
Owner SUZHOU UNIV
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