Composite diaphragm as well as preparation method and application thereof
A composite diaphragm and diaphragm material technology, applied in the field of lithium-ion batteries, can solve the problems of increasing the manufacturing cost of ceramic diaphragms, high toxicity of organic solvents, flammable and volatile safety, etc.
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[0052] Example 1
[0053] The synthesized alumina nanoparticles, sodium carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR) with a mass ratio of 95:2:3 mixed powder 1g, put in deionized water and acetone (3:1, v : V) 10ml of mixed solution, ball mill the resulting ceramic slurry overnight, ultrasonically disperse the mixed slurry for 20 minutes, and apply the resulting slurry to diaphragm coating. The ceramic diaphragm is made of ordinary polyethylene (PE) diaphragm as the diaphragm substrate. The obtained slurry is evenly coated on one side or both sides of an ordinary polyethylene (PE) separator. Use an electric heating plate to preheat at 60°C, and after most of the solvent is volatilized, put it in a vacuum oven at 60°C to dry overnight to completely remove the solvent to obtain a modified ceramic diaphragm.
[0054] figure 1 In order to obtain a scanning electron micrograph of a composite diaphragm with alumina as an inorganic powder, it can be clearly observed...
Example Embodiment
[0055] Example 2
[0056] Mix 1g of synthesized silica nanoparticles and polyacrylate terpolymer latex (LA132) with a mass ratio of 90:4:6, and put deionized water and ethanol solvent (3:1, v:v) mixed solvent 15ml, ball mill the resulting ceramic slurry overnight, ultrasonically disperse the mixed slurry for 30 minutes, and apply the resulting slurry to diaphragm coating. The ceramic diaphragm is made of ordinary polypropylene (PP) diaphragm as the diaphragm substrate. The obtained slurry is uniformly coated on one side or both sides of an ordinary polyethylene (PP) separator. Use an electric heating plate to preheat at 60°C, and after most of the solvent is volatilized, put it in a vacuum oven at 60°C to dry overnight to completely remove the solvent to obtain a modified ceramic diaphragm.
[0057] figure 2 In order to prepare the SEM picture of the composite diaphragm with silica as inorganic powder, it can be clearly observed that the silica powder is evenly spread on the sur...
Example Embodiment
[0059] Example 3
[0060] The synthesized magnesium oxide nanoparticles and polyacrylate terpolymer latex (LA133) with a mass ratio of 85:6:9 mixed powder 1g, put in a suitable ratio of deionized water and acetone (3:1, v:v ) Mix 20 ml of solvent, ball mill the resulting ceramic slurry overnight, ultrasonically disperse the mixed slurry for 40 minutes, and apply the resulting slurry to diaphragm coating. A ceramic diaphragm is made of polyvinylidene fluoride (PVDF) diaphragm as the diaphragm substrate. The obtained slurry is uniformly coated on one side or both sides of a polyvinylidene fluoride (PVDF) separator. Use an electric heating plate to preheat at 60°C, and after most of the solvent is volatilized, put it in a vacuum oven at 60°C to dry overnight to completely remove the solvent to obtain a modified ceramic diaphragm.
[0061] The heat shrinkage rate diagram of the composite diaphragm of Example 3 before and after heat shrinkage is shown in Figure 4 with 5 .
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