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3046 results about "Polyvinylidene fluoride" patented technology

Polyvinylidene fluoride or polyvinylidene difluoride (PVDF) is a highly non-reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride. PVDF is a specialty plastic used in applications requiring the highest purity, as well as resistance to solvents, acids and hydrocarbons. Compared to other fluoropolymers, like polytetrafluoroethylene (Teflon), PVDF has a low density (1.78 g/cm³).

Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof

The invention discloses a large-capacity high-power polymer lithium iron phosphate power battery. The weight ratio of anode slurry is as follows: 81 to 85 percent of lithium iron phosphate, 1 to 5.5 percent of superconduction carbon, 0 to 2.5 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 0 to 2.5 percent of crystalline flake graphite, 0 to 2 percent of carbon nanometer tube as well as 6 to 7.5 percent of polyvinylidene fluoride; the weight ratio of cathode slurry is as follows: 89 to 91 percent of cathode material, 1 to 3.5 percent of superconduction carbon, 0 to 2 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 2.5 to 3.5 percent of styrene-butadiene rubber as well as 1.5 to 2 percent of sodium carboxymethyl cellulose; the steps for preparing the battery are as follows: preparing slurry, coating the anode and the cathode, rolling and pressing a polar plate, transversely and separately cutting the polar plate, baking the polar plate, welding the polar ears of the anode and the cathode, preparing a battery cell, putting the electric core into a shell and sealing, baking the electric core, injecting liquid into the battery as well as forming the battery and dividing the volume of the battery. The invention relates to a lithium-ion secondary battery which can provide drive energies for electric tools, electric bicycles, motor cars and electric vehicles.

Method for preparing high-flux composite membrane from dopamine-modified nanometer material

The invention relates to a method for preparing a high-flux composite membrane from a dopamine-modified nanometer material and belongs to the technical field of modification of membrane materials. The method is characterized by comprising the following steps of: forming an active poly-dopamine composite layer on the surfaces of titanium dioxide nanometer grains by utilizing automatic polymerization of dopamine, selecting different concentrations of dopamine-modified titanium dioxide grains, and adding the modified nanometer grains utilized as additives into a membrane casting solution, in which the mass fraction of PVDF (Polyvinylidene Fluoride) is 13% and the mass fraction of PVP (Polyvinyl Pyrrolidone) is 4%, so as to bend and modify according to different proportions, thus obtaining a composite membrane prepared from dopamine-modified nanometer titanium dioxide. The method for preparing the high-flux composite membrane from the dopamine-modified nanometer material, disclosed by the invention, has the advantages that dopamine-modified titanium dioxide can be greatly dispersed in an organic solvent to form a uniform dispersed phase; the additive can be used for effectively improving the hydrophilcity and anti-pollution capability of the high-flux composite membrane; and the dopamine modification method is simple, the condition is gentle, the flux of the prepared membrane is large and the anti-pollution capability is strong.

Carbon-sulfur composite material used for positive pole of lithium-sulfur battery and preparation method of material

ActiveCN102969487AUniform structureInhibition of lithium polysulfide dissolutionCell electrodesStored energySulfur
The invention relates to a carbon-sulfur composite material used for a positive pole of a lithium-sulfur battery. The carbon-sulfur composite material is characterized in that elemental sulfur is filled in a multi-hole hollow carbon ball which is synthesized through a simple template method, and the elemental sulfur is injected into the multi-hole hollow carbon ball by adopting a fusion diffused method; the carbon-sulfur composite material is used for preparing a positive pole material of a high-performance lithium-sulfur battery cell, the positive pole is composed of the carbon-sulfur composite material, a binding agent and an electric conduction agent, and polytetrafluoroethylene or polyvinylidene fluoride is used as the binding agent; and the electric conduction agent is a mixture of one or more than two of carbon nanometer fibre, electric conduction graphite, acetylene black and Super p in any proportion. The carbon-sulfur composite material provided by the invention has the advantages that compared with the reportorial lithium-sulfur secondary battery, the preparation method of the anode material is simple, the large specific capacity is 1450 Ahg-1, the coulomb efficiency is high and is greater than 99.0%, the cycle performance is good, the initial capacity is kept 93.6% after circulating for 50 weeks and the like, and the carbon-sulfur composite material is expected to be applied to the next generation large-scale stored energy batteries.

Polyvinylidene fluoride microporous film and preparation method

The invention provides a polyvinylidene fluoride microporous film and a preparation method; the polyvinylidene fluoride microporous film is prepared by using polyvinylidene fluoride, fatty alcohol (non solvent) and polar organic solvent as raw materials, the proportioning of which is as follows: the mass content of polyvinylidene fluoride is 10%-15%, and the content of non solvent is 6-12%; the specific steps are as follows: polyvinylidene fluoride, polar organic solvent and non solvent are mixed, dissolved and filtered, set aside and are deaerated to obtain clear casting film liquid which is struck on a coarse structure template substrate and placed in air; gel forms film in a coagulating bath, is processed by hot water, and then soaked in water and absolute ethyl alcohol to obtain high hydrophobic polyvinylidene fluoride microporous film; the contact angle between the surface of high hydrophobic polyvinylidene fluoride microporous film and water reaches 130 degrees to 140 degrees, air flux of the film reaches 6.0m<3>/(m<2>-h-kPa) under 60kPa, the maximum bore diameter is less than 0.5 mum, tensile strength reaches breaking strength which is larger than 5Mpa, and the elongation at break is larger than 50%. The invention is the polyvinylidene fluoride microporous film with high hydrophobicity, high flux and good mechanical strength and the preparation method, which is mainly applied to the film distillation and associated film process.

Method for modifying polyvinylidene fluoride ultrafiltration membrane by amphiphilic co-polymer

The invention discloses a method of producing the hyperfiltration membrane of amphiphilic copolymer modified polyvinylidene fluoride, comprising the following steps: 1) mixing polyvinylidene fluoride, poly (methyl methacrylate - monomethyl ether polyoxyethylene methyl methacrylate), additives, non-solvent and solvent to form the casting film solution; 2) making the casting film solution into the polyvinylidene fluoride membrane by using the film forming machine and then soaking in the coagulation bath; 3) conducting the posttreatment of hydrophilicity; 4)obtaining the hydrophilic polyvinylidene fluoride ultrafiltration membrane after cleaning and drying. The method is characterized in that the brush shape, chain ball shape or dumbbell shape amphiphilic copolymer are mixed with the polyvinylidene fluoride to produce the polyvinylidene fluoride hyperfiltration membrane with hydrophilicity, anti-pollution, large flux and high retention rate by adopting the solution phase conversion method. The method has the advantages that the obtained membrane is provided with dozens to hundreds nanometer of particular densified hydrogel surface layers, the contact angle of the membrane surface can be reduced below 60 degrees and can be lowered to 0 degree within tens of seconds, the water flux can reach 1000L /m<2>/ h (0.1Mpa) or above, the retention rate of BSA can reach 90% or more and the recovery rate of water cleaning flux can reach 90% or higher.

Method for preparing polyvinylidene fluoride ultra-filtration membranes

The invention discloses a method for preparing polyvinylidene fluoride ultra-filtration membranes. The method includes the steps of mixing the polyvinylidene fluoride with diluents, and heating the mixture to form a homogeneous phase solution, wherein the diluents are a mixture of a solvent and a non-solvent of the polyvinylidene fluoride, and at least one of the solvent and the non-solvent of the polyvinylidene fluoride can be dissolved in water; subjecting the homogeneous phase solution to knife coating on a supporting screen to form a plate-shaped membrane casting solution or to be spinned into a membrane casting solution in a hollow fiber shape by a spinneret, submerging the membrane casting solution into a cooling liquid to be cooled, subjecting the membrane casting solution to phase separation and solidifying into membranes; extracting the diluents in the membranes through an extracting agent to obtain the polyvinylidene fluoride membranes. Sections of the polyvinylidene fluoride membranes are in a homogeneous spongeous structure with bore diameters in a range of 0.02 to 4 microns, and the membranes have surface layers with surface bore diameters ranging from 2 nanometers to 100 nanometers. Simultaneously, the polyvinylidene fluoride ultra-filtration membranes have the advantages of high strength, porosity, flux and separation accuracy.
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