A method for detecting oil content of lithium battery separator by dsc
A technology of lithium battery diaphragm and oil content, which is applied in the direction of lithium battery, measuring electricity, secondary battery, etc., can solve the problems of strong volatility of dichloromethane, low test efficiency, environmental pollution, etc., and achieve the effect of improving test efficiency
Active Publication Date: 2022-06-03
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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Problems solved by technology
[0003] In the lithium battery industry, the traditional test for the white oil content of the diaphragm is mainly through ultrasonic cleaning agents, and dichloromethane is used to extract the white oil in the diaphragm. After oven drying, the white oil content is obtained by weighing method. The time for methane to extract white oil and the time for drying the film in an oven are long, and the test efficiency is low. On the other hand, dichloromethane is highly volatile during the process of dichloromethane extraction of white oil, causing environmental pollution
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[0015] In order to clearly illustrate the technical solutions in the embodiments of the present invention, the experimental process is described in more detail below. First, a conventional diaphragm with a thickness of 12um and a porosity of 40% is selected, and then the oil content of the diaphragm in different procedures is tested (the procedures include Die head, CAST, MD0, TD01, TD02), compared by two methods.
[0016] (1) Traditional method
[0017] Take a piece of diaphragm, weigh the weight m1, put the diaphragm into an ultrasonic cleaner (power 300W) equipped with dichloromethane, and ultrasonicate for 20 minutes. During the ultrasonic process, keep shaking the diaphragm with tweezers. After 20 minutes, put the diaphragm again. Enter the ultrasonic cleaner (power 300W) equipped with new dichloromethane, and ultrasonic for 10min, the purpose is to extract the white oil in the diaphragm clean. After 2 times of cleaning, use tweezers to remove the diaphragm from the ultr...
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Abstract
The invention provides a method for detecting the oil content of a lithium battery diaphragm by DSC, which comprises the following steps: taking 5-10 mg of an oil-containing diaphragm sample on the lithium battery diaphragm body, and taking 5-10 mg of an oil-free diaphragm on the oil-free diaphragm The first enthalpy value was obtained by using a differential calorimetry scanner to test the oil-free diaphragm sample at room temperature, and the second enthalpy value was obtained by using a differential calorimetry scanner to test the oil-containing diaphragm sample. For the enthalpy value, subtract the first enthalpy value from the second enthalpy value to obtain a difference, and then divide the difference by the first enthalpy value to obtain the oil content in the oil-containing membrane sample. Compared with the prior art, the invention improves the test efficiency of the oil content of the lithium battery diaphragm, and is more environmentally friendly.
Description
technical field [0001] The invention relates to the detection of the oil content of a lithium battery diaphragm, in particular, to a method for detecting the oil content of a lithium battery diaphragm by using DSC. Background technique [0002] At present, the preparation methods of microporous membranes for separators can be divided into two types: dry method (melt stretching, MSCS) and wet method (thermally induced phase separation, TIPS). The basic process of thermally induced phase separation (TIPS) refers to dissolving the polymer in a high-boiling, low-volatility solvent (white oil) at high temperature to form a homogeneous liquid, and then cooling down and cooling, resulting in liquid-solid phase separation of the solution. Or liquid-liquid phase separation, and then use a volatile reagent (dichloromethane) to extract the high-boiling point solvent (white oil), and obtain a polymer microporous membrane with a certain structure and shape after drying. The quality is v...
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IPC IPC(8): G01N25/20
CPCG01N25/20G01K17/04Y02E60/10G01N25/4866H01M50/411H01M10/052H01M50/403G01K7/425G01N25/005G01N25/4873G01N25/4893G01N2011/0093G01R31/36H01M10/0525
Inventor 张叶青翁星星金骋陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD