Device for directly combining nano fiber diaphragm on lithium ionic cell electrode surface and the method

A composite nanofiber, lithium-ion battery technology, applied in secondary batteries, active material electrodes, battery pack components, etc., can solve the problems of slow production speed, unsuitable for large-scale production, and inability to accurately control membrane performance, etc. The effect of meeting technical requirements

Inactive Publication Date: 2008-06-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, what is designed in this patent is a single nozzle electrospinning device, the production speed is extremely slow, and it is not suitable for large-scale production
At the same time, the patent does not discuss the conditions of electrospinning and film-forming performance, so the performance of the film cannot be accurately controlled, and the stability of battery performance cannot be guaranteed.

Method used

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  • Device for directly combining nano fiber diaphragm on lithium ionic cell electrode surface and the method
  • Device for directly combining nano fiber diaphragm on lithium ionic cell electrode surface and the method
  • Device for directly combining nano fiber diaphragm on lithium ionic cell electrode surface and the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] See Figure 1 ~ Figure 2 . A device with a temperature control device 7 and a mechanical control integration 8 for direct preparation of the electrode sheet surface of a lithium ion battery and a composite nanofiber diaphragm, the single-row multi-needle spinneret 1 of the electrospinning machine in the device (such as figure 2 shown) is connected to the negative high voltage output by one end of the high-voltage DC power supply 2 through a wire, and the feed hole of the multi-needle spinneret 1 is connected with the metering infusion pump 3 through a pipeline; There is a receiving roller 4 with a rotating motor, a solvent recovery device 6 is placed above the receiving roller 4, and a transmission winding device 5 with a rotating motor is installed in front of the receiving roller 4. The receiving roller 4 is connected to a high-voltage DC power supply 2 through a wire The other end is connected to the ground wire, and the receiving roller is effectively grounded thro...

Embodiment 2

[0046] See figure 1 , image 3 . Device structure is the same as the device of embodiment 1, just change single-row multi-needle spinneret into dense array multi-needle spinneret (such as image 3 shown).

[0047] Prepare a polyacrylonitrile solution with a weight concentration of 9.5%. The viscosity of the solution is between 600 and 700mPa·S. Stir at 25°C for 7 days. The electrode sheet coated with the negative electrode material modified natural graphite on the surface of the metal copper foil is circulated between the receiving roller and the transmission winding device, the electrode sheet conveying speed is 120cm / min, the electric field applied between the spinneret and the electrode (receiving roller) The intensity is 1000V / cm, the distance is 20cm, and the moving speed of the spinneret is 30-60cm / min. Turn on the drive winding device, the receiving roller, the metering infusion pump and the motor of the electrospinning machine, and the polyacrylonitrile spraying l...

Embodiment 3

[0049] The device is the same as in Example 1.

[0050] Prepare a mixed solution containing polyvinylidene fluoride with a weight concentration of 7.5% and polyacrylonitrile with a weight concentration of 1.0%, add 1.0% polymethyl acrylate (both by weight percentage), and the viscosity of the solution is 600-700mPa·S In between, stir at 25°C for 7 days, filter and put it on the machine, and use a single row of multi-needle nozzles to scan and spray horizontally. The electrode sheet coated with the negative electrode material natural graphite on the surface of the metal copper foil is circulated and conveyed between the receiving roller and the transmission winding device, and the electrode sheet conveying speed is 120cm / min. The electric field strength applied between the spinneret and the electrode (receiving roller) is 1000V / cm, the distance is 18cm, and the moving speed of the spinneret is 30-60cm / min. Turn on the drive winding device, the receiving roller, the metering in...

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Abstract

The invention relates to a device for directly preparing and compounding a nano fiber diaphragm on the surface of an electrode slice in a lithium ion battery and a method based on the device. The invention enables two processes of preparation of the diaphragm on the lithium ion battery and the assembly of the diaphragm and the electrode slice to be completed in one time. The invention is realized by an electrostatic spinning machine for the diaphragm on the lithium ion battery which can be produced continuously, and the key component is a spinneret of high-efficiency electrostatic spinning. By applying an electrostatic spinning method to directly spray a polymer nano fiber diaphragm on the surface of the electrode slice in the lithium ion battery (which takes platinum analogs as a substrate) under a specific technological condition, the two technological processes of preparation of the diaphragm on the lithium ion battery and the assembly of the diaphragm / electrode slice are completed in one time. The invention can not only produce the diaphragm on the lithium ion battery with high performance, but also renovate the traditional assembly technique of the lithium ion battery. The produced composite material of the diaphragm / electrode slice meets the technical requirements of a common lithium ion battery and a power lithium iron battery.

Description

technical field [0001] The invention relates to a device for directly preparing and compounding a nanofiber diaphragm on the surface of a lithium-ion battery electrode sheet, and a method for applying the device. technical background [0002] Lithium-ion battery separator is a porous film that blocks the positive and negative electrodes to prevent internal short circuit of the battery, but allows the ion flow to pass through quickly, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes during electrochemical charging and discharging. The current commercial lithium battery separators are mainly from some companies in Europe, the United States, Japan and other countries, such as Celgard, Ube, Asahi, Tonen, Mitsui Chemicals, Polypore / Membrana and Entek. The main preparation process is divided into two types: dry method (precision stretching) and wet method (phase inversion), which can produce polyethylene (PE) or polypropylene (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M2/14H01M4/02H01M50/403
CPCY02E60/122Y02E60/10
Inventor 吴大勇刘新厚刘昌炎
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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