Ceramic membrane, preparation method of lithium ion secondary battery and battery
A ceramic diaphragm and diaphragm technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of the influence of the pore structure of the diaphragm substrate, it is difficult to meet industrial production, and the preparation process is complicated, and achieve excellent thermal stability. , easy industrial production, simple and easy-to-control process
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[0028] The preparation method of the lithium ion secondary battery of the present invention includes:
[0029] 1) Preparation of positive electrode sheet: mix lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride in N-methylpyrrolidone solvent to make a positive electrode slurry, then coat it on aluminum foil and dry and cool it Pressing, slitting, trimming, and tab welding to make a positive electrode sheet;
[0030] 2) Preparation of negative electrode sheet: Mix graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene-butadiene rubber in deionized water to make negative electrode slurry, then coat it on copper foil and bake it After drying, perform cold pressing, slitting, trimming, and tab welding to make a negative electrode sheet;
[0031] 3) Diaphragm substrate: made of PE or PP microporous film;
[0032] 4) Preparation of the ceramic diaphragm: add the main chain substance to the mixed solvent of ethanol and deionized water,...
Example Embodiment
[0047] Example 1
[0048] Preparation of positive electrode sheet: mix lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride with a mass ratio of 96:2.2:1.8 in N-methylpyrrolidone (NMP) solvent to make a positive electrode slurry, and then coat it After being dried on aluminum foil at 110°C, cold pressing, slitting, trimming, and tab welding are performed to make a positive electrode sheet.
[0049] Preparation of negative electrode sheet: Graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene butadiene rubber are mixed uniformly in deionized water at a mass ratio of 95:1.5:1.5:2.0 to make a negative electrode slurry, and then After coating on copper foil and drying at 85°C, cold pressing, slitting, trimming, and tab welding are carried out to make a negative electrode sheet.
[0050] Diaphragm: A polyethylene microporous film with a thickness of 9um is used as the isolation membrane.
[0051] Preparation of ceramic diaphragm: Add...
Example Embodiment
[0053] Example 2
[0054] Preparation of positive electrode sheet: mix lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride with a mass ratio of 96:2.2:1.8 in N-methylpyrrolidone (NMP) solvent to make a positive electrode slurry, and then coat it After being dried on aluminum foil at 110°C, cold pressing, slitting, trimming, and tab welding are performed to make a positive electrode sheet.
[0055] Preparation of negative electrode sheet: Graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene butadiene rubber are mixed uniformly in deionized water at a mass ratio of 95:1.5:1.5:2.0 to make a negative electrode slurry, and then After coating on copper foil and drying at 85°C, cold pressing, slitting, trimming, and tab welding are carried out to make a negative electrode sheet.
[0056] Diaphragm: A polypropylene microporous film with a thickness of 12um is used as the isolation membrane.
[0057] Preparation of ceramic diaphragm: A...
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