Composite diaphragm, preparation method thereof and lithium ion battery

A technology of composite diaphragm and composite base material, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems that it is difficult to completely prevent the penetration of nanomaterials, and achieve improved safety, charge and discharge performance, and good thermal dimensions. The effect of stability

Active Publication Date: 2014-10-08
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because the pore size of this type of membrane is mostly micron, and more and more nanomaterials are used as electrode materials in

Method used

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  • Composite diaphragm, preparation method thereof and lithium ion battery
  • Composite diaphragm, preparation method thereof and lithium ion battery
  • Composite diaphragm, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0024] see figure 1 , the embodiment of the present invention provides a preparation method of a composite diaphragm, which includes the following steps:

[0025] S1, preparing non-woven fabric-organic polymer composite substrate;

[0026] S2, preparing a composite gel; and

[0027] S3, compounding the composite gel with the non-woven fabric-organic polymer composite substrate.

[0028] First, the step S1 is introduced. The non-woven fabric-organic polymer composite substrate contains the following two components: 1) non-woven fabric and 2) polymer monomers containing alkenyl groups and alkoxysilanes containing alkenyl groups. A cross-linked polymer formed by copolymerization under the action of a catalyst and a cross-linking agent. The nonwoven fabric is a nanofiber nonwoven fabric used in lithium-ion battery separators. Preferably, the heat-resistant temperature of the non-woven fabric is greater than 200°C, specifically polyimide nanofiber non-woven fabric, polyethylene...

Embodiment

[0085] Soak the polyimide nanofiber non-woven fabric in the modification solution for 5 minutes, take it out, and dry it at 80° C. to obtain the non-woven fabric-organic polymer composite substrate. The components of the modification solution are: 10 parts of vinyltriethoxysilane, 80 parts of methyl methacrylate, 10 parts of diethylene glycol divinyl ether, 1 part of benzoyl peroxide, 5000 Parts of ethyl acetate (mass ratio).

[0086] Mix 10 mL of tetrabutyl titanate with 100 mL of isopropanol to form a first solution. Mix deionized water and 80 mL of isopropanol to form a second solution, and add hydrochloric acid to the second solution to make the pH value 3-4. The molar ratio of deionized water to tetrabutyl titanate is 4:1. The first solution was mixed with the second solution and heated at 45°C to form a titanium sol solution. The titanium sol solution was heated to 58° C., vinyltriisopropoxysilane and MMA monomer were added to the titanium sol solution, and uniformly ...

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Abstract

The invention relates to a composite diaphragm. The composite diaphragm comprises a non-woven fabric-organic polymer composite base material, and a composite gel compounded with the non-woven fabric-organic polymer composite base material, wherein the non-woven fabric-organic polymer composite base material comprises a non-woven fabric and a cross-linked polymer, and the cross-linked polymer is formed by copolymerization of a polymer monomer containing alkenyl and alkoxy silane containing alkenyl in the presence of a catalyst and a cross-linking agent; the composite gel comprises a gel polymer and inorganic modified nano powder, and the inorganic modified nano-powder comprises a polymer formed by copolymerization of methyl methacrylate and a silane coupling agent containing C=C groups, and further comprises a nano-sol connected with the alkoxy silane by virtue of condensation reaction. The invention also relates to a preparation method of the composite diaphragm and a lithium ion battery.

Description

technical field [0001] The invention relates to a composite diaphragm for lithium ion batteries, a preparation method thereof, and a lithium ion battery using the composite diaphragm. Background technique [0002] In lithium-ion batteries, the existing polyolefin separators are difficult to meet the stringent requirements of next-generation energy storage or power supply safety in terms of thermal stability and resistance to lithium dendrite puncture. This kind of separator is generally obtained by dry or wet pore-making technology and stretching. The disadvantage is that when the battery temperature is too high, it will first produce severe thermal shrinkage, causing the separator to collapse, resulting in short circuit in the battery, thermal runaway, Then a serious safety accident occurred. To this end, diaphragm manufacturers at home and abroad are stepping up their efforts to develop next-generation diaphragms. [0003] The nanofiber non-woven diaphragm has extremely ...

Claims

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Application Information

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IPC IPC(8): D06M15/356D06M15/256C08F220/14C08F230/08C08F292/00H01M2/16H01M10/0525D06M101/30H01M50/403H01M50/414H01M50/44H01M50/446H01M50/489
CPCY02E60/122C08F220/14C08F292/00D06M15/256D06M15/356H01M10/0525Y02E60/10C08F230/085H01M50/489
Inventor 尚玉明张森曹江何向明王莉李建军王要武
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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