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A kind of preparation method of heat-shrinkable power battery diaphragm

A power battery and separator technology, applied in the field of power battery separator preparation, can solve the problems of many coating processes, complex comprehensive performance control process, etc., and achieves the advantages of fast deposition rate, simple manufacturing method and production equipment, and increased feasibility. Effect

Active Publication Date: 2018-01-02
DONGHUA UNIV
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  • Summary
  • 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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  • A kind of preparation method of heat-shrinkable power battery diaphragm
  • A kind of preparation method of heat-shrinkable power battery diaphragm
  • A kind of preparation method of heat-shrinkable power battery diaphragm

Examples

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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 method for preparing a heat-resistant and shrinkable power battery diaphragm, comprising: passing a discharge gas into a dielectric barrier discharge plasma reactor, discharging the discharge gas to generate plasma through high-voltage alternating current, and feeding a precursor from a carrier gas and The reaction gas is sent into the plasma area to react, and the reaction product is deposited on the substrate to obtain a heat-resistant and shrinkable power battery diaphragm. The invention is simple and easy to implement, has simple manufacturing and production equipment, short time, convenient preparation, no catalyst or template is needed; the preparation process has low energy consumption, low pollution, fast deposition rate, and no other solvent is used in the diaphragm deposition process, which belongs to The green and environment-friendly dry method increases the feasibility of industrial application.

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 Patents(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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