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

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 ...

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