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Method for testing porosity of battery diaphragm coated alumina ceramic coating

A technology for coating alumina and ceramic coatings, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem of affecting battery ion conduction performance, battery internal resistance and electrochemical performance and other issues to achieve applicable and reliable results

Inactive Publication Date: 2013-05-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic coating coated on the surface of the diaphragm will inevitably affect the conduction performance of ions inside the battery, thereby affecting the internal resistance and electrochemical performance of the battery.
Therefore, it is necessary to accurately evaluate the porosity of the ceramic coating itself on the surface of the diaphragm before applying the diaphragm to the product. At present, there is no reliable test method available

Method used

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Experimental program
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Embodiment Construction

[0011] A method for testing the porosity of a battery diaphragm coated with an alumina ceramic coating, comprising the following steps:

[0012] (a) Cut a section of sample on the ceramic coating diaphragm to be tested, and then use a puncher to punch out three identical circular samples with a radius R=3cm in the middle of the diaphragm to ensure the stability of the sample material and facilitate follow-up test calculation.

[0013] (b) Use an electronic balance to weigh the quality of the punched sample, and use a micrometer to test the thickness of the sample. Each sample is weighed at least three times, and the thickness is measured and recorded, and then averaged to ensure Accuracy of sample weighing and thickness measurement.

[0014] (c) Place the sample in a place filled with aqua regia (HNO 3 : HCl=1:3) soaked in a beaker for 24 hours, then took out the sample and rinsed it in a solution containing NaOH for several times to ensure that the ceramic coating on the su...

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Abstract

The invention discloses a method for testing the porosity of a battery diaphragm coated alumina ceramic coating, which comprises the following steps: (a) on a diaphragm of a ceramic coating to be tested, punching a sample by using a perforating machine; (b) carrying out weighting and thickness testing on the punched sample; (c) placing the sample in a beaker filled with a chloroazotic acid, after the sample is soaked 24 hours, taking out the sample, placing the sample in a solution filled with NaOH to rinse, and then washing the sample by using distilled water; (d) placing the sample in a baking oven at a temperature of 80 DEG C to bake, and after the sample is taken out, carrying out weighting and thickness testing on the sample; and (e) according to the changes in thickness and weight of the sample before soaking and after baking, through a calculation formula, conveniently, accurately and effectively obtaining the porosity of the ceramic coating. The method is simple and easy to implement, reliable and applicable.

Description

technical field [0001] The invention relates to a method for testing the porosity of a battery diaphragm coated with an alumina ceramic coating. technical background [0002] The main structural components of lithium-ion battery cells are positive electrode, negative electrode, electrolyte and separator. The separator is the base material that isolates the positive and negative pole pieces to prevent the short circuit of the battery. Its main function is to play the role of ion conductivity and electron insulation, and the conductivity of ions is directly related to the electrochemical performance of the battery. The conductivity of ions is related to the many micro-through holes in the diaphragm. When the battery is overcharged or discharged or the internal micro-short circuit occurs, the internal temperature of the battery will rise, and the micro-pores of the diaphragm will self-close under a certain high temperature environment; When the temperature continues to rise, t...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N5/04
Inventor 姚汪兵陈萍周元王晨旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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