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Lithium battery isolation membrane and lithium battery using same

A technology for separators and lithium batteries, applied in secondary batteries, battery pack components, circuits, etc., to achieve good high-rate discharge effects, low ionic impedance, and favorable effects for large-scale promotion

Inactive Publication Date: 2011-01-26
FULLYMAX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the lithium battery industry has not really found such an isolation film suitable for high-current discharge.

Method used

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  • Lithium battery isolation membrane and lithium battery using same
  • Lithium battery isolation membrane and lithium battery using same
  • Lithium battery isolation membrane and lithium battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Existing lithium battery

[0029] Taking the existing lithium battery, the thickness, porosity, air permeability and pore size of the separator are shown in Table 1.

Embodiment 2

[0030] Embodiment 2 Lithium battery of the present invention

[0031] Replace the separator of the lithium battery of Example 1 with the separator of the present invention. The parameters of the separator of the present invention are shown in Table 1, and the rest are the same as in Example 1.

[0032] The performance parameter of isolation film in the embodiment of table 1

[0033] Separator

Embodiment 3

[0035] Measure the discharge rate situation of embodiment 1 lithium battery and embodiment 2 lithium battery, the result is respectively as follows figure 1 and figure 2 shown.

[0036] From figure 1 It can be seen that the separator of the existing lithium battery cannot be discharged normally under the current of 55C, while figure 2 It can be seen that the lithium battery adopting the separator of the present invention also has a very high capacity percentage at a current of 55C.

[0037] From figure 2 It can be seen that after adopting the separator of the present invention, the lithium battery can increase the maximum discharge current to above 85C, and the effect is very obvious.

[0038] With the lithium battery of embodiment 1 and embodiment 2, under the same discharge current situation, carry out the comparison of discharging situation, the result is as follows image 3 shown. From image 3 It can be seen that under the same discharge current situation, takin...

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Abstract

The invention discloses a lithium battery isolation membrane and a lithium battery using the same. The thickness of the isolation membrane is 15 to 30 microns, the porosity is 47 to 58 percent, the air permeability is 60 to 220S / cc, and the average aperture is 0.15 to 0.25 micron. The isolation membrane is favorable for high-amplification discharge of the lithium battery. The conventional lithium battery can achieve good high-amplification discharge effect only by adopting the isolation membrane, does not need complex process improvement, has low cost and convenient operation, and is favorable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery separator suitable for high-rate discharge and a lithium battery using the separator. Background technique [0002] Lithium battery is an energy storage device with high specific energy. It has the advantages of stable discharge voltage, wide working temperature range, low self-discharge rate, cycle charge and discharge, long storage life, no memory effect and no pollution. At present, as the application fields of lithium-ion batteries become more and more extensive, different users have different requirements for lithium-ion batteries. In the field of lithium-ion batteries for model use, the pursuit of rate discharge (high current discharge) is getting higher and higher. According to the current technology, the highest discharge rate of lithium-ion batteries used in this field is about 50C ~ 60C. This technology is still difficult to meet the user's...

Claims

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Application Information

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IPC IPC(8): H01M2/18H01M10/0525H01M50/489H01M50/491
CPCY02E60/122Y02E60/10
Inventor 袁卉军吴路东侯桃丽黄斌何瑜何信刘长昊
Owner FULLYMAX BATTERY CO LTD
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