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Lithium ion secondary battery polymer separation film corona processing method

A secondary battery, corona treatment technology, applied in battery pack parts, non-aqueous electrolyte batteries, electrolyte battery manufacturing and other directions, can solve the problem of unfavorable bonding, the interface between the separator and the electrode is not tightly combined, affecting the energy density and energy density of the battery. security and other issues

Active Publication Date: 2013-08-07
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the polypropylene material is a difficult-to-stick material, which is not conducive to the bonding between the positive and negative electrodes. The interface between the separator and the electrode is not tightly bonded, which will greatly affect the energy density and safety of the battery.

Method used

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  • Lithium ion secondary battery polymer separation film corona processing method
  • Lithium ion secondary battery polymer separation film corona processing method
  • Lithium ion secondary battery polymer separation film corona processing method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Corona treatment machine provides 50Hz, 5000V / m 2 AC voltage, using 20μm thick polyethylene lithium battery diaphragm material as the treatment sample, and passing through the corona treatment machine at a speed of 1m / min. Measure the temperature of the corona treatment equipment space as 25°C and the relative humidity as 20%. The output power of the corona treatment machine is controlled at 30%, and the single-sided corona discharge treatment is performed on the transmission diaphragm material. Surface appearance of polyethylene battery separator figure 1 As shown, the scanning electron microscope image is shown in figure 2 shown. The surface appearance of the diaphragm after corona treatment is as follows image 3 As shown, the scanning electron microscope image is shown in Figure 4 shown. The figure above shows that after 30% power corona discharge treatment, the surface of the separator occasionally has needle-like appearance, indicating that the corona outp...

Embodiment 2

[0025] Corona treatment machine provides environment and corona treatment time with described in embodiment 1. The corona-treated separators were placed in different environments, and the relevant wettability tests were carried out. The contact angle of polyethylene separator without corona discharge treatment is 69 degrees, after 5%, 10%, 20%, 30% and 35% power corona discharge treatment, the contact angle becomes 58 degrees, 39 degrees, 32 degrees, 29 degrees and 28 degrees. It shows that the 20μm thick polyethylene lithium battery separator undergoes corona discharge treatment, the contact angle of the separator becomes smaller, the surface tension increases, and the wettability is enhanced. The output power of corona discharge between 10 and 30% has a good effect on the experimental separator Effect. After the separator was placed at room temperature for 5 days, the contact angle was measured again. The contact angle of the untreated separator was 73 degrees, and the con...

Embodiment 3

[0027] Corona treatment machine provides environment and corona treatment time with described in embodiment 1. The corona discharge treated diaphragm was soaked in electrolyte, and its liquid retention was tested after standing for different times at room temperature. After 5%, 10%, 20%, 30%, 35% output power corona treatment of the diaphragm, its liquid retention performance has been improved to a certain extent, and the liquid retention capacity of the corona treated diaphragm battery is increased by about 0.01 compared with the untreated diaphragm battery. g, 0.08g, 0.1g, 0.12g, 0.12g. By comparing the liquid retention capacity of the diaphragm battery treated with corona with different powers, the corona discharge power between 10% and 30% will have a significant impact. At room temperature, the corona-treated separator was soaked in the electrolyte at 10-30% power and placed for 15 days. The separator still had good liquid retention, indicating that the corona effect was...

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Abstract

The invention relates to a lithium ion secondary battery polymer separation film corona processing method. According to the invention, a polymer molecule separation film is adopted as a substrate; various ions produced by air ionization under high-frequency and high-voltage discharge conditions are accelerated and impact the separation film under the effect of a strong electric field, such that polymer molecule chemical bonds are broken and degraded. Therefore, separation film surface roughness and surface area are increased, and print substrate surface adhesion capacity is improved. With large amount of strong oxidant ozone produced by air ionization, the film polymer molecules are oxidized, such that high-polarity groups such as carbonyl groups and peroxide are produced. Therefore, film surface energy is improved, wettability and film liquid retention of the film to a polar solvent can be improved, and ion permeability and safety are improved. According to a porous gel separation film lithium battery subjected to corona processing, the battery has excellent rate performance and small internal resistance, and a battery liquid retention can be improved by 2-3%, such that battery performance is improved.

Description

technical field [0001] The invention relates to a corona treatment method for a polymer diaphragm of a lithium-ion secondary battery, in particular to a process method for high-frequency and high-voltage corona treatment of a polymer molecular diaphragm to improve its structure so as to improve battery performance. Background technique [0002] At present, in energy storage power sources such as lithium-ion secondary batteries and supercapacitors, polymer separators have been widely used because they can significantly improve the cycle life and energy density of energy storage power sources, and have good processability. The application of polymer molecular diaphragms in energy storage power supplies can not only improve the problems of power supply leakage, combustion and explosion, but also significantly improve its high-energy, high-current charge and discharge performance, and can be widely used in future new energy vehicles, power grid regulation Peak and electronic com...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 纪效波宋维鑫方来兵陈启元李叙
Owner CENT SOUTH UNIV
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