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Method for detecting areal density of ceramic coating of lithium ion battery separator

A lithium-ion battery, ceramic coating technology, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., to achieve the effect of great practical significance

Inactive Publication Date: 2018-12-21
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But, also do not have a kind of method at present, it can accurately and effectively measure the areal density (i.e. coating amount) of the ceramic coating in the ceramic diaphragm, and then for evaluating the quality of ceramic diaphragm, as the coating quality of ceramic coating , coating uniformity, etc.

Method used

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  • Method for detecting areal density of ceramic coating of lithium ion battery separator
  • Method for detecting areal density of ceramic coating of lithium ion battery separator
  • Method for detecting areal density of ceramic coating of lithium ion battery separator

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Embodiment 1

[0046] In this embodiment, the method of the present invention is adopted to detect the density of the ceramic coating surface of the ceramic diaphragm sample to be detected.

[0047] Step 1: Scanning electron microscopy (SEM) is used to scan and observe the cross-sectional morphology of the ceramic diaphragm, such as figure 2 As shown, A is the base film, and B is the ceramic coating. It can be determined that the ceramic diaphragm is coated on one side, that is, the number of ceramic coating surfaces n is 1;

[0048] Step 2: Cut a square test sample with a side length of 2.4cm from the ceramic diaphragm to be tested, then its area A=2.4×2.4=5.76cm 2 ; With an electronic balance, its mass m obtained by weighing is 7.1300g;

[0049] Step 3: Put the above test samples in the crucible of the thermogravimetric analyzer, set the test conditions of the thermogravimetric analyzer, and detect the thermogravimetric curve of the ceramic diaphragm sample according to the preset test c...

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Abstract

The invention discloses a method for detecting areal density of a ceramic coating of a lithium ion battery separator. The method comprises the steps: the first step: for a ceramic separator to be detected, observing upper and lower sides of the ceramic separator to determine the coating situation of the ceramic coating on the ceramic separator; the second step: intercepting and weighing a detecting sample of the preset area on the ceramic separator to be detected to obtain the quality of the detecting sample; the third step: placing the detecting sample in a crucible of a thermal gravimetric analyzer, heating the detecting sample, and obtaining a thermal gravimetric curve of the detecting sample by detection of the thermal gravimetric analyzer; the fourth step: obtaining the percentage ofresidual mass of the detecting sample after combustion in an oxygen atmosphere within the thermal gravimetric analyzer; and the fifth step: calculating the areal density of the ceramic coating in thedetecting sample. The invention can accurately and effectively measure the areal density of the ceramic coating in the ceramic separator, and further provides a basis for evaluating the quality of theceramic separator.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for detecting the surface density of a lithium-ion battery diaphragm ceramic coating. Background technique [0002] At present, with the widespread promotion and application of new energy vehicles, lithium-ion batteries are an important part of electric vehicles. While their demand is increasing, their safety performance has attracted much attention. [0003] As a key component of a lithium-ion battery, the diaphragm is mainly used to isolate the positive and negative electrodes in the battery to prevent short circuits caused by contact between the positive and negative electrodes. Ions can freely pass through the micropores. [0004] Conventional polyolefin separators will undergo significant heat shrinkage in high-temperature environments, which will cause the positive and negative electrodes of the battery to contact and cause an internal short circuit, which will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02G01N9/36
CPCG01N9/02G01N9/36
Inventor 赵培李慧芳王睿伍绍中
Owner TIANJIN LISHEN BATTERY
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