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Method and device for testing ionic conductivity of diaphragm

A technology of ionic conductivity and testing method, which is applied in the direction of measuring devices, measuring device shells, and components of electrical measuring instruments, etc., can solve the problems of speeding up the development of functional diaphragm test cycles, complex pore channels, etc., to reduce impact and save costs Effect

Pending Publication Date: 2021-09-24
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore channels inside the commonly used PE, PP or both composite diaphragms at this stage are often more complex, which poses a challenge to the accuracy of the pass rate test of the diaphragm. Therefore, it is necessary to propose a high-precision and relatively simple preparation The test method of the electrochemical test device and the evaluation method of the ion pass rate of the diaphragm, in order to speed up the test cycle of developing a functional diaphragm, and reduce the test consumption, reduce the interference of other interference factors on the ion pass rate of the diaphragm, and increase the test accuracy

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  • Method and device for testing ionic conductivity of diaphragm

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Embodiment 1

[0051] This embodiment provides a method and device for testing the ionic conductivity of the diaphragm, based on the test method and device provided in a specific embodiment, wherein:

[0052] The diameter of stainless steel disc 4 is 40mm;

[0053] The material of the diaphragm holder 5 is Teflon, the thickness of the diaphragm holder 5 is 10 μm, the outer diameter of the diaphragm holder 5 is 40 mm, and the inner diameter of the diaphragm holder 5 is 20 mm;

[0054] The concentration of lithium hexafluorophosphate is 0.5mol / L;

[0055] The diameter of the diaphragm is 10mm.

[0056] The test device for the ionic conductivity of the diaphragm was assembled in sequence in a high-purity argon environment, sealed and placed in the argon gas for 12 hours, and the AC impedance test was performed to measure the resistance R0, and then the diaphragm was replaced with two layers of 5 μm diaphragms. And repeat the above steps to obtain R1, R2, R3, and use the number of diaphragm la...

Embodiment 2

[0058] This embodiment provides a method and device for testing the ionic conductivity of the diaphragm, based on the test method and device provided in a specific embodiment, wherein:

[0059] The diameter of stainless steel disc 4 is 50mm;

[0060] The material of the diaphragm holder 5 is Teflon, the thickness of the diaphragm holder 5 is 16 μm, the outer diameter of the diaphragm holder 5 is 45 mm, and the inner diameter of the diaphragm holder 5 is 24 mm;

[0061] The concentration of lithium hexafluorophosphate is 1.0mol / L;

[0062] The diameter of the diaphragm is 14mm.

[0063] The test device for the ionic conductivity of the diaphragm is assembled in sequence in a high-purity argon environment, sealed and left to stand in the argon for 12 hours. It is tested for AC impedance and the resistance R0 is measured. After that, the diaphragm is replaced with a three-layer 5 μm diaphragm. And repeat the above steps to obtain R1, R2, R3, and use the number of diaphragm laye...

Embodiment 3

[0065] This embodiment provides a method and device for testing the ionic conductivity of the diaphragm, based on the test method and device provided in a specific embodiment, wherein:

[0066] The diameter of stainless steel disc 4 is 60mm;

[0067] The material of the diaphragm holder 5 is Teflon, the thickness of the diaphragm holder 5 is 20 μm, the outer diameter of the diaphragm holder 5 is 50 mm, and the inner diameter of the diaphragm holder 5 is 27 mm;

[0068] The concentration of lithium hexafluorophosphate is 1.5mol / L;

[0069] The diameter of the diaphragm is 18mm.

[0070] The test device for the ionic conductivity of the diaphragm was assembled in sequence in a high-purity argon environment, sealed and placed in argon for 12 hours, and the AC impedance test was performed to measure the resistance R0, and then the diaphragm was replaced with a four-layer 5μm diaphragm. And repeat the above steps to obtain R1, R2, R3, and use the number of diaphragm layers as the...

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Abstract

The invention provides a method and a device for testing the ionic conductivity of a diaphragm. The testing method comprises the following steps: assembling batteries with different diaphragm layer numbers, respectively carrying out alternating-current impedance testing on each battery, carrying out linear fitting on resistance value data obtained by testing, and calculating the ion passing rate of the diaphragm. In the invention, the diaphragm ion conductivity testing device is adopted to test the conductivity of the diaphragm in the thickness direction so as to evaluate the diaphragm ion passing rate, the accuracy is relatively high, the preparation is relatively simple, and the method can be used for relatively directly simulating the impedance generated when lithium ions penetrate through the diaphragm. Meanwhile, the method does not need to use positive and negative electrode materials, but adopts stainless steel wafers as symmetrical electrodes, so that the influence of other interference factors on the test is reduced while the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery testing, and relates to testing of lithium-ion battery diaphragms, in particular to a method and device for testing the ion conductivity of the diaphragm. Background technique [0002] As lithium-ion batteries are gradually applied to automotive power, energy storage, drones and other fields, lithium-ion batteries have also attracted widespread attention from consumers. Although lithium-ion batteries have unique advantages compared to traditional batteries, With the update and iteration of electronic products, people began to put forward more requirements on the performance of lithium-ion batteries, which is why new materials for lithium-ion batteries have developed rapidly in recent years. With the rapid development of lithium-ion battery-related materials, the testing methods of new lithium-ion battery materials are gradually becoming more refined and standardized. Therefore, it is n...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R1/04
CPCG01R27/02G01R1/0408G01R1/0425
Inventor 李欣朱其华陈辉徐嘉辉
Owner 东莞维科电池有限公司