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Method for measuring moisten contact angle of powder material

A technology of powder materials and contact angles, applied in the direction of measuring devices, analytical materials, instruments, etc.

Inactive Publication Date: 2009-04-01
SHENZHEN BAK BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

There is no literature report on the wetting contact angle measurement of powder particles in liquid

Method used

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  • Method for measuring moisten contact angle of powder material
  • Method for measuring moisten contact angle of powder material
  • Method for measuring moisten contact angle of powder material

Examples

Experimental program
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Embodiment Construction

[0030] Weigh a certain amount of a certain powder graphite material, put it into a glass tube whose lower end is sealed with a microporous plate, and press it to a fixed scale to obtain a measuring tube. Use the same method to prepare multiple measuring tubes of the same specification.

[0031] 1) Use water as the wetting liquid, place the measuring tube vertically, and make its lower end contact with water, such as figure 2 shown.

[0032] Considering the pores in the glass tube as a bundle of parallel capillaries with an average diameter r, the following formula can be obtained from the Poiseulle formula (Zhang Futian, Fundamentals of Molecular Interface Chemistry, Shanghai Science and Technology Literature Publishing House, June 2006):

[0033] h 2 t = crγ 1 cos θ 2 η...

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Abstract

The invention discloses a method used for measuring the wet contact angle of powder material, comprising the steps as follows: the powder material is put in a pipe-shaped container with the lower end sealed by a porous plate; furthermore, the power material is compressed; the pipe-shaped container is arranged vertically so as to lead the lower end of the pipe-shaped container to contact with the liquid and lead the liquid to soak part of the powder layer; the height and time that the liquid soaks the powder layer are determined; and according to a formula that h<2> / t is equal to cr Gama1cos Theta / 2 Eta, the wet contact angle of the powder material in the liquid is calculated. The invention creatively adopts a capillary rise method to measure the contact angle and can be used for measuring the soaking degree of the liquid soaking the surface of the powder material.

Description

technical field [0001] The invention relates to a method for measuring the wetting contact angle of materials, in particular to a method for measuring the wetting contact angle of powder materials. Background technique [0002] The wetting degree of the electrolyte on the surface of the carbon material will affect the injection speed and volume of the electrolyte, the surface tension of the negative electrode slurry, and then affect the foil coating effect of the negative electrode slurry on the current collector; at the same time, the carbon The surface wettability of the material determines whether the carbon material is oily or water-based. Therefore, evaluating the surface wettability of carbon materials provides a good theoretical basis and practical guidance for the production of lithium-ion batteries. [0003] The contact angle is the main criterion of wettability. The definition of contact angle is that when the liquid drop reaches equilibrium on the surface of the...

Claims

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Application Information

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IPC IPC(8): G01N13/00G06F17/11
Inventor 骆兆军
Owner SHENZHEN BAK BATTERY CO LTD
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