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Method for testing liquid absorption rate and liquid retention rate of diaphragm

A test method and technology of liquid absorption rate, which is applied in the test field of liquid absorption rate and liquid retention rate, can solve problems such as not being able to better reflect the liquid absorption and retention performance of both ends of the diaphragm, and there is no test method for both ends of the diaphragm.

Inactive Publication Date: 2020-11-03
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional technology only discloses the test methods for liquid absorption and liquid retention on the surface of the diaphragm, but there is no test method for the liquid absorption and liquid retention of the two ends of the diaphragm, which cannot better reflect the liquid absorption and liquid retention performance of the two ends of the diaphragm.

Method used

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  • Method for testing liquid absorption rate and liquid retention rate of diaphragm
  • Method for testing liquid absorption rate and liquid retention rate of diaphragm
  • Method for testing liquid absorption rate and liquid retention rate of diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The test process of the liquid absorption rate and the liquid retention rate of the diaphragm of the present embodiment is as follows:

[0063] (1) From the PP diaphragm roll with a thickness of 10 μm cut to a width of 5 cm, cut three 50 cm-long diaphragm samples to be tested along the length direction of the diaphragm roll, and the weight of the diaphragm is M 0 (0.100g).

[0064] (2) Cut out two non-porous aluminum foils with the same shape as the diaphragm to be tested (50cm×5cm×3μm in length, width and thickness), and sandwich the diaphragm to be tested between the two non-porous aluminum foils to form a sample to be tested.

[0065] (3) the sample to be tested obtained in step (2) is wound along the length direction to form a sample roll to be tested, and the sample roll to be tested is placed in a stainless steel housing consistent with the diameter and height of the sample roll to be tested ( Inner diameter 5mm, height 5cm), so that the sample roll to be tested ...

Embodiment 2

[0075] The test process of the liquid absorption rate and the liquid retention rate of the diaphragm of the present embodiment is as follows:

[0076] (1) From the 12μm thick PE diaphragm roll that has been cut into a width of 5 cm, three 50 cm long diaphragm samples to be tested are cut along the length direction of the diaphragm roll, and the weight of the diaphragm is M 0 (0.200g).

[0077] (2) Cut out two non-porous aluminum foils with the same shape as the diaphragm to be tested (50cm×5cm×3μm in length, width and thickness), and sandwich the diaphragm to be tested between the two non-porous aluminum foils to form a sample to be tested.

[0078](2) the diaphragm to be tested obtained in step (2) is wound along the length direction to form a sample roll to be tested, and the sample roll to be tested is placed in a stainless steel housing consistent with the diameter and height of the sample roll to be tested ( Inner diameter 6mm, height 5cm), so that the sample roll to be ...

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Abstract

The invention relates to a method for testing the liquid absorption rate and the liquid retention rate of a diaphragm. The test method comprises the following steps: laminating a layer of non-porous membrane on at least one side of a diaphragm to be tested to form a to-be-tested sample; winding the to-be-tested sample to form a to-be-tested sample roll, putting the to-be-tested sample roll into ashell with an open end and a closed end, and weighing the total mass of the shell and the to-be-tested sample roll; immersing the shell part carrying the to-be-tested sample roll into the test reagent, enabling the to-be-tested sample roll positioned at the open end of the shell to be in contact with the test reagent, and performing standing to enable a diaphragm in the to-be-tested sample roll toabsorb the test reagent; taking out the shell, removing the test reagent adsorbed on the surface of the shell, and weighing the total mass of the shell and the to-be-tested sample roll; and standingthe open end of the shell carrying the to-be-tested sample roll upwards to volatilize the test reagent, weighing the total mass of the shell and the to-be-tested sample roll and calculating the liquidabsorption rate and the liquid retention rate of the diaphragm to be tested according to a formula. The test method can accurately characterize the liquid absorption performance and the liquid retention performance of one end of the diaphragm.

Description

technical field [0001] The invention relates to the field of diaphragms, in particular to a method for testing the liquid absorption rate and liquid retention rate of a diaphragm. Background technique [0002] The ionic conductivity of a battery is one of the most important factors affecting battery performance. The liquid absorption and liquid retention properties of the diaphragm are conducive to the full contact and maintenance of the diaphragm and the electrolyte, thereby improving the ion conductivity. Poor liquid absorption and liquid retention of the separator will increase the battery resistance, affecting the cycle performance and charge-discharge efficiency of the battery. At the same time, the liquid absorption and liquid retention of the diaphragm is also closely related to the pore structure of the diaphragm. Large pore size and high porosity means that the separator has better liquid absorption, and the ion conductivity of the battery is higher; small pore si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02G01N15/08
CPCG01N5/02G01N15/0893G01N2015/0866
Inventor 林陆菁张佳宁杨雪梅陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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