Method for measuring pore distribution of porous structure body

A technology of pore distribution and porous structure, applied in suspension and porous material analysis, measurement devices, permeability/surface area analysis, etc., can solve problems such as the inability to meet the pore measurement requirements of lithium-ion battery electrodes

Active Publication Date: 2012-10-17
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the mercury intrusion method cannot meet the pore measurement requirements of lithium-ion battery electrodes, and it is indeed necessary to find a method that can accurately measure the pore distribution at different positions inside the electrode sheet.

Method used

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  • Method for measuring pore distribution of porous structure body
  • Method for measuring pore distribution of porous structure body
  • Method for measuring pore distribution of porous structure body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take a 100ml clean beaker and a magnetic stirring bar for use. First configure a dilute nitric acid solution with a concentration of 1M, pipette 12ml of dilute nitric acid solution into a 100ml clean beaker, and add 17 grams of siloxane liquid with a purity of 99.9% to the beaker with a precisely controlled volume pipette gun. The mass ratio of dilute nitric acid to siloxane is 0.7, and the sealed beaker is magnetically stirred at room temperature, and the stirring speed is 1000 rpm. After stirring for 5 minutes, a clear hydrolyzate was obtained.

[0028] Dry the lithium-ion battery cathode sheet to be measured, and use a pipette gun with precise volume control to suck 0.05ml of hydrolyzate and drop it in the middle of the electrode sheet to be tested, and the hydrolyzate will quickly penetrate into the electrode sheet.

[0029] The above-mentioned cathode sheet was soaked in liquid nitrogen for 10 minutes, and it was brittle after being taken out. Electron scattering...

Embodiment 2

[0031] Take a 100ml clean beaker and a magnetic stirring bar for use. First configure a dilute nitric acid solution with a concentration of 1M, pipette 12ml of dilute nitric acid solution into a 100ml clean beaker, and add 17 grams of siloxane liquid with a purity of 99.9% to the beaker with a precisely controlled volume pipette gun. The sealed beaker is magnetically stirred at room temperature, and the stirring speed is 1000rpm. After stirring for 5 minutes, a clear hydrolyzate was obtained.

[0032] Dry the anode piece of the lithium-ion battery to be measured, use a pipette gun with precise volume control to draw 0.05ml of hydrolyzate and drop it in the middle of the pole piece to be tested, and the hydrolyzate will quickly penetrate into the pole piece.

[0033]The above-mentioned cathode sheet was soaked in liquid nitrogen for 5 minutes, and it was brittle after being taken out. Electron scattering energy spectrometer was used to collect the surface distribution of sili...

Embodiment 3

[0035] Prepare the hydrolyzate of siloxane according to the method in embodiment 1, wherein, dilute nitric acid volume is 20ml, and the siloxane quality that purity is 99.9% is 10 grams, and the mass ratio of dilute nitric acid to siloxane is 2, and uses The same method as in Example 1 was used to calculate the pore size and porosity distribution along the thickness direction of the rolled lithium-ion battery anode sheet.

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Abstract

The invention discloses a method for measuring the pore distribution of a porous structure body. The method comprises the following steps: filling products obtained through hydrolyzing an organic matter containing a characteristic element in an acidic/alkaline environment to the porous structure body, carrying out brittle failure and section exposing, acquiring the characteristic element distribution on the section through adopting an electron scattering spectrometer, and computing through using a computer image analyzing and processing method to obtain the area occupied by the characteristic element, and the ratio of the area to the total area to obtain the pore distribution at a specific position, and the porosity amount distribution. The method of the invention can be widely applied to the characterization of the pore distribution in the porous structure body, can be used for detecting influences of a technological process and an electrochemical process to porous structures in lithium ion battery electrode slices, and is important for the optimization of technological parameters and electrochemical process parameters.

Description

technical field [0001] The invention relates to the measurement of the distribution of pores in a porous structure, in particular to a method for quickly and simply measuring the three-dimensional distribution of pores in an electrode sheet of a lithium ion battery. Background technique [0002] Lithium-ion batteries, as a chemical power source with high energy density, play an irreplaceable role in modern mobile communication devices and other fields. With the rapid growth of demand for lithium-ion batteries in emerging fields such as electric vehicles and energy storage, the demand for high-energy-density lithium-ion battery cathode and anode materials is also increasingly urgent. At the same time, the design optimization of lithium-ion battery pole pieces based on existing cathode and anode materials has long been a means to increase the energy density of batteries, and thick electrode technology is one of the important ways. [0003] Generally, the pole piece of a lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 张宁欣严宏伟唐华琼李白清
Owner NINGDE AMPEREX TECH
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