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Inorganic/organic composite porous lithium battery diaphragm and preparation method thereof

A lithium battery separator and porosity technology, which is applied in the field of inorganic/organic composite polypropylene (PP) non-woven fabric-based lithium battery separator and its preparation, can solve the trouble of making PE-PP sheath core composite fibers and is not suitable for lithium batteries Diaphragm, non-woven fabric with large pore size and other problems, to achieve the effects of excellent charge-discharge cycle performance, improved mechanical strength, and high liquid absorption rate

Active Publication Date: 2012-07-04
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of PVdF-HFP containing nano-Al2O3 particles is low, and the application is affected by it
[0011](2) Japanese scientist Tae-Hyung Cho et al. made non-woven fabrics with nano-SiO2 and PE-PP sheath-core composite fibers Film and PAN nanofiber non-woven film, the composite film made by hot calendering method has excellent water absorption and ion conductivity, as well as good thermal stability (see: Journal of Power Sources. 2010, 195: 4272– 4277); but PE-PP sheath-core composite fiber is troublesome to make, and cannot change the disadvantage of poor electrophile of the membrane
[0013] Although non-woven fabric has the advantages of low cost and convenient production, it is not suitable for direct use as lithium battery separator due to the large pore size of non-woven fabric

Method used

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  • Inorganic/organic composite porous lithium battery diaphragm and preparation method thereof
  • Inorganic/organic composite porous lithium battery diaphragm and preparation method thereof
  • Inorganic/organic composite porous lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 6

[0038] Embodiments one to six: SiO 2 Preparation of / PVdF-HFP / PP non-woven composite lithium battery separator

Embodiment 1

[0039] Example 1: Preparation of PVdF-HFP / PP non-woven composite diaphragm

[0040] Dry the reaction bottle and stirring bar in an oven at 120 °C for at least 6 hours, and dry polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP, Solvay, trade name Solef 21216 / 1001) at 80 °C for at least 6 hours. Let dry for 6 hours. Cool to room temperature after taking it out, and weigh it immediately for use.

[0041] Weigh 4.000 grams of PVdF-HFP and 0.400 grams of hydrophilic agent F127, put them in a round bottom flask, then add 4.000 grams of DMF (N,N-dimethylformamide) and 36.000 grams of acetone, and stir at room temperature for 1 hour , and then heated to 60 ° C and continued to stir for 2 hours to obtain a uniform mixed solution, which was cooled to room temperature.

[0042] PP non-woven fabric of suitable size (approximately 9 mm x 12 mm in area) is placed on a dry PE board, pipette the mixed solution onto the non-woven fabric with a rubber dropper, and use an adjusta...

Embodiment 2

[0043] Example 2: SiO 2 / PVdF-HFP / PP non-woven fabric (PVdF-HFP:SiO 2 =100: 2) Preparation of composite separator

[0044] Dry the reaction bottle and stirrer in an oven at 120 °C for at least 6 hours in advance, PVdF-HFP and SiO with a particle size of 18nm 2 Dry at 80°C for at least 6 hours. Cool to room temperature after taking it out, and weigh it immediately for use.

[0045] Weigh 4.000 g of PVdF-HFP, 0.080 g of SiO 2 and 0.400 grams of F127 in a round-bottomed flask, then added 4.000 grams of DMF (N,N-dimethylformamide) and 36.000 grams of acetone, stirred at room temperature for 1 hour, then raised the temperature to 60°C and continued to stir for 2 hours. A homogeneous mixed solution was obtained and cooled to room temperature.

[0046] PP non-woven fabric of suitable size (approximately 9 mm x 12 mm in area) is placed on a dry PE board, pipette the mixed solution onto the non-woven fabric with a rubber dropper, and apply the solution with an adjustable film appl...

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Abstract

The invention belongs to the field of lithium batteries, and relates to an inorganic / organic composite porous lithium battery diaphragm and a preparation method thereof. The inorganic / organic composite porous lithium battery diaphragm comprises a base material layer and an inorganic / organic composite porous diaphragm layer arranged on the surface of the base material layer, wherein the base material layer adopts polypropylene non-woven fabrics; the inorganic / organic composite porous diaphragm layer adopts a polyvinylidene fluoride- hexafluoropropylene multipolymer containing inorganic nano grains and hydrophilizing agents; and the inorganic nano grains are silicon dioxide nano grains or coupling agent improved silicon dioxide nano grains. The inorganic / organic composite porous lithium battery diaphragm provided by the invention has the advantages that the production cost of the lithium battery diaphragm is lowered while high ion-conductivity, excellent electrochemical performance, high mechanical strength and low thermal shrinking percentage are ensured.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to an inorganic / organic composite polypropylene (PP) non-woven fabric-based lithium battery diaphragm and a preparation method thereof. Background technique [0002] The lithium-ion battery separator is one of the core components of the lithium battery. It is called the "third electrode" of the battery. It is an electrically insulating film with a porous structure. Its main function is to separate the positive and negative electrodes and prevent the battery from short-circuiting. , and at the same time allow the ion load body to pass quickly when the battery is connected to the circuit. The performance of the separator is a key factor affecting the performance of the battery, which requires the separator to have high ionic conductivity, good mechanical strength, appropriate pore size and porosity, and high temperature resistance. [0003] At present, the separators widely used in lit...

Claims

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Application Information

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IPC IPC(8): B32B27/02B32B27/12B32B27/18B32B3/24H01M2/16
CPCY02E60/12Y02E60/10
Inventor 张明祖徐玲妍倪沛红何金林孟菊雯
Owner SUZHOU UNIV
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