A Method for Evaluating the Base Film Effect of Different Temperatures in Ceramic Coated Separators
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A technology of ceramic coating and diaphragm, applied in the field of analysis, can solve the problem that the base film cannot be evaluated, and achieve the effect of non-destructive and simple method
Active Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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[0004] Based on the technical problems in the background technology, the present invention proposes a method for evaluating the influence of different temperatures on the base film of the ceramic coated diaphragm, so as to overcome the inability to evaluate the state of the base film of the ceramic coated diaphragm at different temperatures. insufficient
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Embodiment 1
[0017] A method for evaluating the effect of different temperatures on a base film in a ceramic coated separator comprising the steps of:
[0018] S1. Use alcohol to wipe the surface of the ceramic-coated diaphragm to be tested until the base film is exposed to obtain the diaphragm a;
[0019] S2. Divide the diaphragm a into a control group and at least one experimental group, then raise the temperature of the experimental group to 120-140° C., and keep it warm for 0.8-1.2 hours to obtain the diaphragm b;
[0020] S3. Weigh the diaphragm b, calculate its area, and calculate the basis weight of the basement membrane;
[0021] S4. Making the diaphragm b into a sample to be tested, spraying gold, placing it in the sample chamber of a scanning electron microscope, and photographing the morphology of the base film to determine the state of the base film of the ceramic-coated diaphragm to be tested at different temperatures.
Embodiment 2
[0023] A method for evaluating the effect of different temperatures on a base film in a ceramic coated separator comprising the steps of:
[0024] S1. Wipe the surface of the ceramic-coated diaphragm to be tested with a solvent until the base film is exposed to obtain a diaphragm a;
[0025] S2. Divide the diaphragm a into a control group and three experimental groups, and then raise the temperature of the experimental groups to 120°C, 130°C and 140°C respectively, keep it warm for 1 hour, and leave the control group untreated to obtain the diaphragm b;
[0026] S3. Weigh the diaphragm b, calculate its area, and calculate the basis weight of the basement membrane, as shown in the table below;
[0027] group Heating temperature, ℃ Basement membrane mass, g Basement membrane area, cm 2
Basement film surface density, g / m 2
control group room temperature 9.42×10 -2
131.50 7.16 Experimental group 1 120 9.39×10 -2
130.25 7.21 E...
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Abstract
The invention discloses a method for evaluating the influence on a base film in a ceramic coating diaphragm caused by different temperatures. The method comprises the following steps of wiping the surface of a ceramic coating diaphragm to be tested by a solvent until the base film is exposed to obtain a diaphragm a; dividing the diaphragm a into a control group and at least one experiment group; then, raising the temperature of the experiment group to 120 to 140 DEG C; performing heat insulation for 0.8 to 1.2h to obtain a diaphragm b; weighing the diaphragm b; calculating the area; calculating the base weight of the base film; making the diaphragm b into a sample to be tested; spraying gold; putting the diaphragm b into a scanning electron microscope sample cabin; shooting the base film appearance so as to judge the state of the base film of the ceramic coating diaphragm to be tested at different temperatures. The problem that the state of the base film of the ceramic coating diaphragm at different temperatures can not be evaluated can be solved. By various evaluation methods, whether the base film state is normal or not can be judged; the result is important basis for judging theceramic coating diaphragm hole closing temperature; the method is simple and convenient; no damage is caused on the base film.
Description
technical field [0001] The invention relates to the technical field of analysis, in particular to a method for evaluating the influence of different temperatures on a base film in a ceramic coating diaphragm. Background technique [0002] The ceramic coated diaphragm is based on PP, PE or multi-layer composite diaphragm, and the surface is coated with a layer of aluminum oxide material. After special processing, it is tightly bonded to the substrate, which significantly improves the high temperature resistance and performance of the lithium-ion battery. safety. Ceramic coated diaphragm has high temperature resistance, high safety, high rate, good wettability, unique self-shutdown characteristics, self-discharge rate, and long cycle life. Ceramic-coated separators have been widely used in lithium-ion batteries. [0003] However, in the ceramic coated diaphragm, since the surface is coated with a layer of alumina, it is difficult to judge the state of the base film (PE, PP o...
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