Method of testing porosity

A technology of porosity and pycnometer method, which is applied in the direction of measuring device, specific gravity measurement, permeability/surface area analysis, etc., can solve the problems of expensive instruments and consumables, cumbersome testing process, high cost of testing process, etc. and the effect of cheap consumables

Inactive Publication Date: 2013-06-05
TIANJIN ENERGIES
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Problems solved by technology

[0005] In view of this, the present invention provides a method for testing porosity to overcome the high cost of the

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  • Method of testing porosity
  • Method of testing porosity

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Embodiment Construction

[0024] For the sake of reference and clarity, the descriptions, abbreviations or abbreviations of technical terms used in the following are summarized as follows:

[0025] True density: refers to the actual volume of the solid substance in the volume of the material in an absolutely dense state, excluding internal voids.

[0026] Porosity: The ratio of the volume of measurable pores and pores (pore volume and pore volume) to the total volume occupied in a certain amount of solid.

[0027] Diaphragm: Commonly used diaphragm materials for batteries include porous membranes of fiber paper or non-woven fabric and synthetic resin. Common diaphragms include porous membranes of polypropylene and polyethylene.

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments o...

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Abstract

The invention discloses a method of testing porosity. The method comprises that a certain sample is cut and taken, the mass M of the sample is weighed, the size V of the sample is measured, a true density test is carried out through a pycnometer method to obtain the true density rho of the sample, and the porosity of the sample is calculated according to a formula. According to the method of testing the porosity, the true density of the sample is measured through the pycnometer method, the size and the mass of the sample are measured, and the calculation of the porosity of the sample is carried out through the formula. The method of testing the porosity of a battery diaphragm and a pole piece through a true density method is simple in testing process, convenient and accurate, and instruments and consumable items used in a testing process are low in cost.

Description

Technical field [0001] The invention relates to the field of material technology detection, and more specifically, to a method for testing porosity. Background technique [0002] Lithium-ion battery separators and positive and negative pole pieces are the core components of lithium-ion batteries, and porosity is a key indicator to measure its performance. If the porosity of the membrane is too low, the air permeability will be poor, the electrolyte adsorption capacity will be weak, and the conductivity will be low. If the membrane porosity is high, the lithium ion penetration ability will be strong, but too high porosity may weaken the puncture ability of the microporous membrane The increase in shrinkage and the deterioration of mechanical properties result in safety issues during the use of the microporous membrane and changes in performance. For the porosity of the pole piece, the higher the porosity, the lower the areal density, resulting in lower battery capacity. [0003] A...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N9/36
Inventor 杨桂红王淑霞宋洁王丹丹
Owner TIANJIN ENERGIES
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