A metal composite oxide-coated battery separator and its preparation method and application
A metal composite and battery diaphragm technology, applied in the field of materials, can solve the problems of poor wettability and ion conductivity, poor battery cycle performance, and insignificant improvement in the heat resistance of the diaphragm, so as to improve the lithium ion conductivity and comprehensive electric capacity. Effects of improving chemical properties, improving interfacial compatibility, and improving migration ability
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preparation example Construction
[0037] The battery separator coated with the above metal composite oxide can be obtained by the following preparation method. The specific method steps are as figure 1 shown, including:
[0038] Step 110, according to the required mass fraction, the metal composite oxide Mg x m y O, wetting and dispersing agent, binder, auxiliary agent and solvent are dispersed and stirred in the mixing tank for 1-5 hours to obtain the slurry;
[0039] Wherein, x=0.1-2, y=0.1-2.
[0040] The dispersion speed is 500rmp-5000rmp, and the stirring speed is 5rmp-50rmp.
[0041] Step 120, filter the dispersed slurry through a 150-mesh sieve, uniformly coat on at least one surface of the base film, and dry at 25° C. to 75° C. to obtain a metal composite oxide-coated battery separator.
[0042]Specifically, the coating method includes any one of gravure coating, spray coating, dip coating and doctor blade method.
[0043] In the above method steps, the selection and mass parts of each component ...
Embodiment 1
[0047] This example provides a preparation method of a metal composite oxide-coated lithium-ion battery separator and its performance for lithium-ion batteries.
[0048] Add 20g of polyvinylpyrrolidone, 5g of sodium carboxymethylcellulose and 5kg of deionized water into the pre-stirring tank, and disperse at a dispersion speed of 3000rpm for 1 hour to obtain the first slurry.
[0049] 1000g Mg 0.5 Cu 0.5 O was added to the first slurry, dispersed at a dispersion speed of 2500 rpm for 1.5 hours, and the dispersed slurry was put into a sand mill for sand milling for 0.5 hour to obtain a second slurry.
[0050] 150 g of styrene-butadiene rubber and 15 g of polyether-modified siloxane were added to the second slurry for thorough stirring to obtain a third slurry; wherein, the stirring speed was 25 rpm.
[0051] Filter the slurry through a 150-mesh screen to obtain the desired metal composite oxide slurry.
[0052] The above slurry was uniformly coated on the surface of the base...
Embodiment 2
[0065] This example provides a method for preparing a lithium-ion battery separator coated with a metal composite oxide.
[0066] 1000g Mg 0.5 Ti 0.25 0. Sodium dodecylbenzenesulfonate of 10g, Polyethylene Glycol of 10g, Polyvinyl Alcohol of 100g, Polydimethylsiloxane of 10g and 4kg deionized water join in stirring tank and disperse and stir for 3 hours, Wherein the dispersion speed is 3000rpm, and the stirring speed is 30rpm;
[0067] The slurry was filtered through a 150-mesh screen, and evenly coated on the surface of a 9 μm polyethylene (PE) base film with an anilox roller and dried to obtain a double-sided coated metal composite oxide-coated battery separator. Wherein, the drying temperature is 60° C., the base film transport speed is 12 m / min, and the coating thickness is 1 μm.
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