Electrospinning technique-based ceramic diaphragm and preparation method thereof

An electrospinning technology and ceramic diaphragm technology, applied in the field of ceramic diaphragm and its preparation, can solve the problems of increased diaphragm thickness, uneven diaphragm pore size, low yield, etc., to improve high temperature resistance and good ion permeability , reduce the effect of heat shrinkage

Inactive Publication Date: 2017-05-10
烟台森森环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN104332575A, CN105845870A, CN103311485A etc. disclose the preparation method of partial diaphragm, although these methods have improved the characteristic of traditional diaphragm high temperature resistance poor, but it is to coat ceramic layer on existing diaphragm basis, do not improve the porosity and the retention of product. Liquid rate, while increasing the thickness of the diaphragm to a certain extent
However, the nanofiber diaphragm prepared by this electrospinning process has a disordered stacking structure of fibers, poor mechanical properties, uneven diaphragm pore size, and low yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A ceramic diaphragm based on electrospinning technology, prepared by the following method:

[0029] 1) Configure a PVDF solution with a concentration of 12wt%, and use an electrospinning process to prepare a nanofiber film with a nanofiber diameter of 150-220nm and a thickness of 18μm. The spinning conditions are: temperature 25°C, humidity 40%, and spinning voltage 22kV , the needle plate distance is 18cm, and the flow rate of feed liquid is 1mL / h;

[0030] 2) Mesoporous Al with an average particle size of 0.1-3 μm 2 o 3 The surface of the ceramic particles is subjected to coupling treatment. The specific method is: mix the ceramic powder with a silicone emulsion with a concentration of 2wt%, and the ratio of the ceramic powder to the silicone emulsion is 1:5 (weight ratio). After mixing evenly, Dry the system at 150°C for 20 hours;

[0031] 3) 15wt% Al 2 o 3 The ceramic particle, the polyvinyl butyral binder of 2.5wt% and the solvent of 82.5wt% are mixed uniforml...

Embodiment 2

[0035] A ceramic diaphragm based on electrospinning technology, prepared by the following method:

[0036] 1) Configure a polyvinylpyrrolidone solution with a concentration of 18wt%, and use an electrospinning process to prepare a nanofiber film with a nanofiber diameter of 150-220nm and a thickness of 18μm. The spinning conditions are: temperature 25°C, humidity 40%, spinning The voltage is 22kV, the needle plate distance is 18cm, and the flow rate of the feed liquid is 1mL / h;

[0037]2) Coupling the surface of silicon dioxide particles with an average particle size of 0.1-3 μm and titanium nitride particles, the weight ratio of silicon dioxide particles and titanium nitride particles is 3:1, the specific method is: silicon dioxide The ceramic powder composed of particles and titanium nitride particles is mixed with the silicone emulsion with a concentration of 5wt%. The ratio of the ceramic powder to the silicone emulsion is 1:8 (weight ratio). After mixing evenly, the syste...

Embodiment 3

[0042] A ceramic diaphragm based on electrospinning technology, prepared by the following method:

[0043] 1) Configure a PVDF solution with a concentration of 18wt%, and use an electrospinning process to prepare a nanofiber film with a nanofiber diameter of 150-220nm and a thickness of 18μm. The spinning conditions are: temperature 25°C, humidity 40%, and spinning voltage 22KV , the needle plate distance is 18cm, and the flow rate of feed liquid is 1mL / h;

[0044] 2) Accurately weigh ethyl orthosilicate, dissolve it in ethanol, prepare a 3wt% ethanol solution, and add ammonia water with a volume fraction of 30% of the volume fraction of ethyl orthosilicate, control the pH of the ammonia water to 11, stir for 12 hours, Prepare the precursor solution;

[0045] 3) The precursor solution is uniformly applied to the separator through a coating device to form a separator layer with a thickness of 4 μm. The coated separator was passed through an oven and dried at a temperature of ...

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Abstract

The invention discloses an electrospinning technique-based ceramic diaphragm and a preparation method thereof. The preparation method comprises the steps of using a spinning nanofiber layer as a base membrane, and then coating / cast coating the base membrane with ceramic slurry or a ceramic precursor solution so as to obtain the final product. The ceramic diaphragm prepared by the method is high in porosity, thin in thickness and good in ion permeability; ceramic particles are introduced into the ceramic diaphragm, so that the thermal contraction of the ceramic diaphragm is greatly reduced, and the high temperature resistance of the ceramic diaphragm is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a ceramic diaphragm and a preparation method thereof. Background technique [0002] The separator is an essential and important part of the lithium-ion battery. On the one hand, it isolates the positive and negative electrodes to avoid contact short circuit between them. storage and release. The quality of lithium battery separator has a great influence on the performance of lithium battery, such as battery internal resistance, discharge capacity, cycle life and battery safety performance. In general, the thinner the separator and the higher the porosity, the smaller the internal resistance of the battery and the better the high-rate discharge performance. In addition, the closure temperature and rupture temperature of the separator have a great influence on the safety performance of the battery. Generally, a separator with a low closure temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/00D06N3/04D06N3/12D01D5/00D04H1/728D01F6/12D01F6/26D01F6/74D06M15/643D06M11/45D06M15/347D06M11/79D06M11/80D06M101/22D06M101/18D06M101/30H01M10/0525H01M2/14H01M2/16
CPCD01D5/003D01F6/12D01F6/26D01F6/74D04H1/728D06M11/45D06M11/79D06M11/80D06M15/347D06M15/643D06M2101/18D06M2101/22D06M2101/30D06N3/0011D06N3/0015D06N3/0034D06N3/0036D06N3/0063D06N3/0081D06N3/04D06N3/047D06N3/12D06N2205/06D06N2207/123D06N2209/06H01M10/0525H01M50/403H01M50/44Y02E60/10
Inventor 段晓博刘向文王恩琪邱凯丽
Owner 烟台森森环保科技有限公司
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