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Testing method of porosity of lithium battery diaphragm

A technology for lithium battery separators and testing methods, which is applied in the directions of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problems of cumbersome operation process, complex and expensive equipment, etc., and achieve simple and operable operation Strong, the effect of overcoming errors

Inactive Publication Date: 2014-01-15
SHENZHEN SENIOR TECH MATERIAL
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Problems solved by technology

However, the first three methods for testing porosity all have specific pore diameter test ranges, and there are also disadvantages such as complicated and expensive equipment and cumbersome operation process.

Method used

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  • Testing method of porosity of lithium battery diaphragm
  • Testing method of porosity of lithium battery diaphragm

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] In order to illustrate the operation process and characteristics of this method more clearly, in this embodiment, the dry-process uniaxially stretched microporous membrane of polypropylene is used as a sample to test the porosity. Other hydrophobic materials such as vinyl fluoride or polytetrafluoroethylene are also within the protection scope of the present invention.

[0027] Porosity refers to the percentage of the total volume of the internal voids of porous materials. According to the definition of porosity, we can get the formula: P=100%×(1-Μ / ρ÷V), V is the volume of drained water, V=(M 2 -M 1 ) / ρ 水 ;

[0028] Among them, P—the porosity of the diaphragm, %;

[0029] M - the mass of the diaphragm, g;

[0030] ρ——True density of diaphragm material, g / cm 3 . In this example, the true density of the polypropylene diaphragm material is 0.91g / c...

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Abstract

The invention relates to the field of battery detection and discloses a testing method of porosity of a lithium battery diaphragm. The testing method comprises the following steps of (1) cutting out a diaphragm sample, (2) weighing the mass of the diaphragm sample on an electronic balance as M, (3) putting a glass containing water on the electronic balance, returning a reading to zero, (4) tying a metal ring with a fine line, holding a free end of the fine line to allow the metal ring to be immersed into the water slowly till the metal ring is completely immersed and suspended in the water, recording the reading of the balance as M1, (5) taking the metal ring out of the water, returning the reading of the balance to zero, (6) rolling the diaphragm sample, sleeving and fixing the diaphragm sample in the metal ring, repeating Step (4), recording the reading of the balance as M2, and (7) working out the porosity P of the diaphragm. The testing method has the advantages of simplicity in operation, accurate testing results, simple equipment, strong operability, low testing cost and the like.

Description

technical field [0001] The invention relates to the field of battery testing, in particular to a testing method for the porosity of a lithium battery diaphragm with simple operation and accurate testing. Background technique [0002] A lithium-ion battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The separator is placed between the positive and negative electrodes. Its main function is to isolate the positive and negative electrodes, but to allow the ions in the battery to pass freely. The ion conductivity of the battery separator is directly related to the overall performance of the battery. The higher the conductivity of the diaphragm, the greater the amount of ions passing through the diaphragm per unit area per unit time. At this time, the charge and discharge performance of the battery will increase. [0003] The porosity can reflect the microporous structure of the separator to a certain extent. The porosity is high, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 陈秀峰陈良吴术球杨佳富王今刚
Owner SHENZHEN SENIOR TECH MATERIAL
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