33results about How to "Improve heat shrink resistance" patented technology

The invention discloses a high-performance flexible composite nonwoven fabric membrane for a lithium ion battery, as well as a preparation method and an application of the membrane, which belongs to the technical field of a lithium-ion battery membrane material. The prepared composite nonwoven fabric membrane is formed by coating functional serous fluid with thermally curable or optically curable functional groups onto a substrate membrane containing an active functional group, thermally curing or optically curing the substrate membrane, removing a pore-forming agent, and hot pressing and drying the substrate. The prepared composite nonwoven fabric membrane is good in flexibility. The composite nonwoven fabric membrane has good ion electric conductivity and hot shrinkage resistance, can bear the large-current discharge, and also can improve the safety performance of the battery. Since no fluorine-containing adhesive is used in a preparation process, nano particles or nano optical fibers are connected with the substrate membrane through a chemical key, the nano particles or the nano fibers are bonded together through the chemical key and free from dropping off in the charging-discharging cycle, the stability of the coating is enhanced, and the cycling performance of the battery can be improved. The prepared flexible composite nonwoven fabric membrane is used as a membrane assembly of the lithium ion battery.

The invention discloses Li7La3Zr2O12 ion conductor ceramic fiber. The material has the chemical composition of Li7La3Zr2O12, has the ion conductor ceramic fiber length of 1-2.5 mu m, the diameter of 80-120 nm and the lithium ion conductivity of 1.5*10<-4> S/cm-6*10<-3> S/cm. The invention further provides a method for preparing the ion conductor ceramic fiber. Lithium carbonate, lanthanum oxide, zirconyl nitrate, a nitric acid solution and absolute ethyl alcohol are mixed, heated and then mixed with citric acid and ethylene glycol, and the mixture is stirred at the constant temperature, and precursor sol is obtained; spinning sol is obtained by mixing a water-soluble polymer and the obtained precursor sol, spinning and calcination are performed sequentially, and ion conductor ceramic fiber with stable morphology and size is obtained. The method can improve the lithium ion conductivity significantly, adopts a simple process, is low in cost, has low requirements for equipment and environment and is suitable for industrial application.

The invention relates to a graphene regenerated rubber and plastic foamed colloidal particle for soles. The graphene regenerated rubber and plastic foamed colloidal particle for soles is prepared fromthe following ingredients in parts by weight: 60 to 65 parts of EVA (Ethylene-vinyl acetate copolymer) waste materials, 23 to 25 parts of natural rubber, 4 to 6 parts of POE (Polyolefin elastomers),1 to 2 parts of modified graphene, 0.1 to 0.2 part of poly N-vinylacetamide, 2.0 to 2.3 parts of white mineral oil, 1.0 to 1.2 parts of silicone oil, 1.4 to 1.5 parts of active zinc oxide, 0.8 to 1.0part of zinc stearate, 0.8 to 1.0 part of stearic acid, 0.8 to 1.0 part of crosslinking agents, 2.0 to 3.0 parts of flow additives and 1.5 to 1.8 parts of foaming agents. According to the invention, the existing EVA waste materials are sufficiently utilized; resources are regenerated; and the foamed colloidal particle with the physical properties reaching a standard and the heat-shrinkage-resistant performance capable of being enhanced is obtained.

The invention relates to a preparation method of a polyolefin composite membrane. The method comprises the following steps of polymerizing methyl methacrylate and gamma-3-(Triethoxysilyl)propyl methacrylate in proportion to form a copolymer with the molecular formula shown in the description; dissolving the copolymer and polyvinylidene fluoride into a first solvent to form a first solution; soaking a perforated polyolefin membrane into a second solvent; coating at least one surface of the perforated polyolefin membrane (which is soaked in the second solvent) with the first solution; soaking the perforated polyolefin membrane coated with the first solution into a third solvent, and punching to form a gel polymer electrolyte prefabrication layer on the surface of the perforated polyolefin membrane; and performing fumigation on the perforated polyolefin membrane with the gel polymer electrolyte prefabrication layer in hydrochloric acid atmosphere. The invention also relates to the polyolefin composite membrane and a lithium ion battery.

In order to solve the problem of poor mechanical strength of the polymer composite film in the prior art, the invention provides a polymer composite film which comprises a porous diaphragm and a fiber layer positioned on the diaphragm, wherein at least one fiber bundle is arranged in the fiber layer; and each fiber bundle comprises a plurality of fibers arranged in parallel. The invention also provides a preparation method of the polymer composite film and a lithium ion battery using the polymer composite film. The polymer composite film provided by the invention has favorable mechanical strength.

The invention relates to a flat plate type denitrification membrane for wastewater treatment and a preparation method thereof, and belongs to the technical field of wastewater treatment. The membranecomprises a non-woven fabric base material layer and a gas permeation layer, wherein the non-woven fabric base material layer and the gas permeation layer are bonded into a whole; the non-woven fabricbase material comprises polypropylene fibers, cellulose fibers and carbon fibers, wherein the polypropylene fiber accounts for 60-90 wt%, the cellulose fiber accounts for 5-30 wt%, the carbon fiber accounts for 5-15 wt%, and the gas permeable layer is an expanded polytetrafluoroethylene film. The flat plate type denitrification membrane provided by the invention is an immersed flat plate membraneand has a large specific surface area, so that the membrane can be directly applied to ammonia-nitrogen wastewater, does not need to be additionally provided with a front filtering device, and is convenient to operate, easy to replace and convenient to clean and overhaul. The flat plate type denitrification membrane has a unique physical structure, the physical structure is highly matched with functionality, the denitrification performance is better, and index parameters such as a contact angle, a pore diameter and air permeability are reasonable.

The invention relates to the field of energy storage materials, in particular to an isolating membrane, a preparation method of the isolating membrane and an electrochemical device comprising the isolating membrane. The isolating membrane comprises a base material and an inorganic layer at least arranged on one side of the base material, wherein the base material is a porous base material, and theinorganic layer is a dielectric layer which does not contain an adhesive; the thickness of the inorganic layer is 20-2000 nm; the ratio of the mass M1 of the inorganic layer to the mass M2 of the base material is M1/M2, wherein M1/M2 is greater than or equal to 0.05 and less than or equal to 7.5; and the interface stripping force of the inorganic layer and the base material is not lower than 30N/m. According to the isolating membrane disclosed by the invention, the ultrathin inorganic layer without the adhesive is arranged on the surface of the porous base material, so that the interface wettability and the thermal shrinkage resistance of the isolating membrane are effectively improved, certain mechanical strength is guaranteed, and the problem that the mechanical strength is lowered andthe base material is blocked caused by falling can be avoided, and the safety and the cycle life of the battery are improved and prolonged. By controlling the ranges of the M1/M2 and the interface stripping force, the energy density is relatively high.

The invention discloses a composite diaphragm and application thereof. The composite diaphragm comprises a diaphragm matrix and an active lithium source coating, wherein the active lithium source coating is arranged on the diaphragm matrix, and the active lithium source coating comprises a nano active lithium source, a nano catalyst, a ceramic electrolyte and a binder. Therefore, multiple effectsof improving the safety of the battery, supplementing lithium and improving the conductivity of the diaphragm are achieved.

The invention relates to high-cohesiveness ceramic coating slurry and a preparation method thereof. The method comprises the steps that: PVDF glue and a kneading agent are added into deionized water to be stirred, the PVDF glueand the kneading agent are combined to form large-particle PVDF micelle, and large-particle PVDF micelle primary slurry is obtained; and ceramic powder, glue, a dispersing agent and a wetting agent are added into the large-particle PVDF micelle primary slurry to be stirred, large-particle PVDF micelle slurry is obtained, and the large-particle PVDF micelle slurry is prepared from, by weight, 20-40 parts of large-particle PVDF primary slurry, 50-70 parts of ceramic powder and 5-15 parts of glue, and the large-particle PVDF micelle primary slurry comprises the following raw materials in parts by weight: 5-7 parts of PVDF glue, 1-3 parts of kneading agent and 1-3 parts of deionized water. According to the preparation method, the kneading agent and the PVDF glueare subjected to kneading pretreatment, so that the PVDF glue forms the large-particle PVDF micelle primary slurry, the large-particle PVDF micelle primary slurry can be highlighted on the surface of the ceramic after being mixed with the ceramic, a corresponding pole piece bonding effect is achieved, and meanwhile, the heat-resistant shrinkage performance of a film is improved.

The invention discloses an anti-shrinkage graphene oxide-based porous battery diaphragm and a preparation method thereof. The porous battery diaphragm is a diaphragm taking graphene oxide as a matrix. The porous battery diaphragm has the beneficial effects that (1) the graphene oxide has good thermal stability, electrochemical inertness and self-film-forming property, and the polyether polyol is grafted, so that the thermal shrinkage resistance of the diaphragm is effectively enhanced, and the size integrity of the diaphragm at 200 DEG C is ensured; (2) the liquid absorption rate of the diaphragm is obviously increased by utilizing the good compatibility between polyether bonds in the polyether polyol and electrolyte; (3) gaps between graphene oxide sheet layers are combined with pores generated between the sheet layers by the PS microspheres, so that the diaphragm generates a rich pore structure, and an adsorption space is provided for liquid absorption of the diaphragm; and (4) the graphene oxide is grafted by using polyether polyol, so that the graphene oxide is inhibited from being reduced into conductive graphene at high temperature, and the thermal stability and safety of the diaphragm are improved.

The invention discloses a composite diaphragm and a preparation method thereof, and relates to the technical field of secondary batteries. The electrostatic spinning thin film is used as the base film, the electrostatic spinning thin film is subjected to electrostatic spinning in a mixing and dissolving mode, the polymer mixture has the advantages of being good in hydrophilicity and high in surface energy, and the affinity of the lithium battery diaphragm to electrolyte can be improved. Besides, one side of the electrostatic spinning film is coated with a nano material, the nano material has the characteristic of high room-temperature ionic conductivity, the conductivity of the lithium battery diaphragm can be improved, and meanwhile, the other side of the base film is coated with PVDF slurry, so that the liquid absorption performance and the heat shrinkage resistance of the composite diaphragm are improved.

The invention discloses a method for preparing a porous carbon heat source material. The method includes the steps that all components and water are primarily mixed through a mixing machine, and then are fed into a screw extruder to continue to be mixed; meanwhile, a foaming agent CO2 is injected into the screw extruder, extrusion molding is conducted after foaming, then drying and cutting are conducted, and the porous carbon heat source material is obtained. According to the method, due to the porous characteristic of a porous carbon heat source, the porous carbon heat source is easy to ignite, full in burning and smooth in thermal flow transferring, and the difficulty, caused by the complex-longitudinal-channel design, of processing molding and reduction, caused by the complex-longitudinal-channel design, of mechanical strength are avoided.