Preparation method of heat-shrinkage-resistant power battery separator

A technology for power batteries and separators, applied in the field of preparation of power battery separators, can solve the problems of many coating processes and complex comprehensive performance control processes, and achieves fast deposition rate, simple manufacturing method and production equipment, good adhesion performance and durability. The effect of high temperature performance

Active Publication Date: 2015-07-29
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the above-mentioned patents involve the bonding between inorganic micro-nano particles and membrane polymers, the agglomeration of micro-nano particles, and the maintenance of the porosity of the membrane. There are many coating processes and the comprehensive performance control process is complicated.

Method used

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  • Preparation method of heat-shrinkage-resistant power battery separator
  • Preparation method of heat-shrinkage-resistant power battery separator
  • Preparation method of heat-shrinkage-resistant power battery separator

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The structure of the plasma reactor using the combination of comb electrode and nozzle electrode is as follows: figure 1 As shown, the reactor includes a comb electrode barrier dielectric tube 2 and a nozzle electrode 3, and the discharge gap is 0.50mm. The blocking medium of the comb-shaped electrodes is quartz, and the distance between the comb-shaped electrodes is 1.00mm. The nozzle electrode 3 is a stainless steel electrode. The substrate is located between electrodes. The frequency of the AC power supply is 10KHz. A high-strength high-modulus polyethylene film 5 with a thickness of 18.00 μm is placed between the barrier medium tube 2 and the shower head electrode 3 and above the ground electrode.

[0060] Under normal temperature and pressure, the discharge gas argon with a flow rate of 0.1slm, the reaction gas oxygen with a flow ratio of 1 / 1000 to the discharge gas, and the carrier gas with a flow ratio of 1 / 500 to the discharge gas (the same as the discharge ...

Embodiment 2

[0063] A plasma reactor structure in which comb-shaped electrodes are cross-combined with comb-shaped electrodes is adopted. The comb-shaped electrodes are covered by a barrier dielectric tube, the discharge gap between the upper and lower comb-shaped electrodes is 2 mm, and the distance between the comb-shaped electrodes is 1 mm. A polyethylene diaphragm 5 with a thickness of 30 μm is placed between the upper and lower barrier medium tubes, above the ground electrode.

[0064] Under normal temperature and pressure, the discharge gas helium with a flow rate of 2slm, the reaction gas oxygen and carbon dioxide gas with a flow rate of 1 / 500 to the discharge gas (each accounting for 1 / 2 ratio), and the carrier gas with a flow rate of 1 / 25 to the discharge gas (same as discharge gas, controlled by different flowmeters) TiCl 4 The loading is carried out through the air inlet 4, and enters the dielectric barrier discharge plasma reactor through the air outlet 6. The frequency of the ...

Embodiment 3

[0067] A plasma reactor structure in which a comb-shaped electrode is combined with a wire-mesh electrode is adopted. The comb-shaped electrode is covered by a barrier medium tube, and the discharge gap between the comb-shaped electrode and the wire-mesh electrode is 5 mm. The spacing is 2mm. A polyethylene diaphragm 5 with a thickness of 15 μm was placed between the comb-shaped electrode and the wire-mesh electrode, above the ground electrode.

[0068] Under normal temperature and pressure, discharge gas argon with a flow rate of 5slm, oxygen with a flow ratio of 1 / 1 to the discharge gas, and carrier gas with a flow ratio of 1 / 10 to the discharge gas (same as the discharge gas, controlled by a different flowmeter) Carry out the trimethylaluminum through the air inlet 4, enter the dielectric barrier discharge plasma reactor through the air outlet 6, set the AC frequency to 150KHz, and the voltage to 30000V, and discharge the mixed gas through a high-voltage AC power supply Pl...

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Abstract

The invention relates to a preparation method of a heat-shrinkage-resistant power battery separator. The method comprises steps as follows: discharge gas is fed into a DBD (dielectric barrier discharge) plasma reactor, the high-voltage alternating current enables the discharge gas to discharge to produce plasma, a precursor is sent into a plasma area for a reaction by the aid of carrier gas and reaction gas, a reaction product deposits on a substrate, and the heat-shrinkage-resistant power battery separator is obtained. The method is simple and easy to implement, manufacturing and production equipment is simple, shorter time is taken, preparation is convenient, and no catalyst or template is required; during preparation, energy consumption is low, pollution is low, the deposition rate is high, no other solvent is used in the separator deposition treatment process, the preparation method is an environment-friendly dry method, and the feasibility of industrial application is increased.

Description

technical field [0001] The invention belongs to the field of preparation of battery separators, in particular to a method for preparing heat-shrinkable power battery separators. Background technique [0002] In recent years, polyolefin lithium-ion battery separators have gradually become the mainstream of the market due to their good ion permeability and mechanical strength, good stability to various chemical substances and chemical solvents, and high-temperature self-closing properties. Currently used mainly polyethylene, polypropylene, polypropylene / polyethylene / polypropylene multilayer composite film and so on. [0003] The disadvantages of these polyolefin separators are relatively low melting point and poor thermal stability, which makes lithium-ion batteries easy to shrink and collapse when used in power batteries, causing safety problems. This is one of the main obstacles that limit the practical application of polyolefin power battery separators. one. [0004] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/443H01M50/449H01M50/489
CPCH01M10/0525H01M50/409H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 王超梁郭颖石建军张菁
Owner DONGHUA UNIV
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