276results about How to "Improve electrolyte resistance" patented technology

The invention provides a non-ionic waterborne polyurethane coating agent for leather and a preparation method thereof. The coating agent is prepared from 20-50 parts of isophorone diisocyanate, 5-35 parts of hexamethylene diisocyanate, 10-30 parts of polytetramethylene glycol, 40-70 parts of polycarbonate diols, 3-10 parts of methoxypolyethylene glycols, 25-35 parts of acetone, 10-20 parts of chain extender, 5-20 parts of a small molecule chain extender, and 150-500 parts of deionized water. The preparation method comprises the following steps: carrying out pre-polymerization reaction, chain extension reaction, emulsification reaction and chain extension reaction. The coating agent is used for leather finishing, and has the advantages of being fluffy, dry and high in elasticity, softness, high fastness and no plastic feeling.

The invention discloses a corrosion resistant aluminum plastic film for lithium battery packaging, which mainly comprises a protective layer, an aluminum foil layer and a heat-seal layer. The corrosion resistant aluminum plastic film is characterized in that: the protective layer and the aluminum foil layer are bonded and combined by a cementing layer, the aluminum foil layer and the heat-seal layer are combined by hot pressing; the aluminum foil layer is subjected to surface treatment by adopting anodic oxidation before bonding combination and hot pressing combination; the material of the heat-seal layer is a three-layer co-extrusion polyolefin composite membrane, of which the inner layer is a bonding layer, the middle layer is a structural layer and the outer layer is a blocked layer; the thickness of the protective layer is 10 to 50mu m, the thickness of the aluminum foil layer is 20 to 80mu m and the thickness of the heat-seal layer is 20 to 120mu m. The product, the aluminum plastic film, has the advantages of higher electrolyte resistance property, and package bonding power, and is suitable for high performance lithium battery packaging.

The invention relates to a preparation method of composite emulsion of cation-nonionic waterborne polyurethane-polyacrylate. The method comprises the following steps of: in synthesis polyurethane reaction, accessing polyacrylate containing terminated hydroxyl into a polyurethane molecular chain through the contained terminated hydroxyl, and forming a side chain of a polyurethane molecule, so as to obtain the composite emulsion combined with a chemical bond, wherein the side chain of the polyacrylate containing the terminated hydroxyl includes a cationic hydrophilic group, a non-ionic segment and a large-resistance group; preparing the polyacrylate containing terminated hydroxyl by using a uniform dripping method in preparation, and then neutralizing and emulsifying to obtain the composite emulsion of cation-nonionic waterborne polyurethane-polyacrylate after reacting with common high-molecular polyol, isocyanate, a crosslinking agent and a common chain extender. The prepared composite emulsion integrates dual advantages of the polyurethane and polyacrylate materials, especially has excellent storage stability and electrolyte resistance, simultaneously has good water resistance and excellent mechanical property, and can be widely applied to the fields such as painting, ink, a binder and the like.

The invention relates to a special adhesive tape for an energy-storage or power lithium battery and a production method of the special adhesive tape. The adhesive tape comprises an adhesive layer, a hardened coating layer, a base layer and a release layer which are sequentially distributed. The base layer is a polyester thin film. The hardened coating layer is an epoxy resin layer and is coated on the front surface of the base layer. The release layer is a single-component non-silicon release agent coating layer and is arranged on the back surface of the base layer. The adhesive layer is arranged on the outer surface of the hardened coating layer. The adhesive tape is provided with a four-layer structure and each layer has a respective function, wherein the adhesive layer is in direct contact with the terminating part of the battery and has the characteristics that the adhesive layer is firm in bonding, is electrolyte-resistant and halogen-free and satisfies (RoHS) Restriction of Hazardous Substances requirements and the like; the hardened coating layer further improves the puncture strength of the base layer; the base layer can be prevented from being punctured by burrs on pole pieces; the release layer has an excellent adhering property and a quick drying performance similar to the base layer. The special adhesive tape for an energy-storage or power lithium battery has the advantages that the adhesive tape is environmentally-friendly, the RoHS requirements are satisfied, the electrolyte resistance is good and the like, and is mainly used for the insulation and the protection of the terminating part of the lithium battery.

The invention relates to a passivation solution for a soft roll lithium battery and a packaging material of the soft roll lithium battery. The passivation solution comprises, by weight part, 0.3 to 1part of a metallic compound, 0.5 to 2 parts of organic acid, 0.5 to 2 parts of film forming polymer, 0.1 to 1 part of bonding resin and 100 to 200 parts of water. The invention further relates to a packaging material for the soft roll lithium battery. The packaging material is composed of a heat resisting layer, a first adhesive layer, an aluminum foil surface passivation treatment layer, an aluminum foil layer, an aluminum foil surface passivation treatment layer, a second adhesive layer and a heat seal layer. The aluminum foil surface passivation treatment layer is formed by coating of the passivation solution on the surface of the aluminum foil. The problem that in the long-term electrolyte resistance operation, bonding performance between the aluminum foil layer and the heat seal layeris seriously reduced or layered is solved, and the service life of the soft roll lithium battery is prolonged.

The invention belongs to the technical field of novel energy resources and in particular relates to a flexible package aluminum-plastic membrane applied to a lithium ion battery. The aluminum-plastic membrane is of a layer structure and comprises a heat-resistant resin layer, an adhesive layer, an aluminum foil layer, an adhesive resin layer 1, a fluorine membrane layer, an adhesive resin layer 2 and a heat sealing layer in sequence from top to bottom; the surface of the heat-resistant resin layer treated by in a corona manner is coated with the adhesive layer; the other surface of the adhesive layer is compounded with a passivated aluminum foil; the surface of the aluminum foil is compounded with the fluorine membrane layer treated in the corona manner when the adhesive resin layer 1 is hot extruded on the surface of the aluminum foil; the other surface of the fluorine membrane layer is compounded with the hot sealing layer when the adhesive resin layer 2 is hot extruded on the other surface of the fluorine membrane layer. The aluminum-plastic membrane provided by the invention is good in interlayer adhesive performance; the service life of the lithium ion battery can be prolonged.

The invention discloses a preparation method of a heat-resistant lithium battery diaphragm. The preparation method comprises the steps that an inorganic material and a dispersing agent are added intodeionized water, and the mixture is ground to obtain a uniform solution; then a suspension stabilizer, a defoaming agent, a wetting agent, a surfactant, a first adhesive and a second adhesive are added, low-speed dispersing is carried out, and water-based ceramic slurry is obtained; after a base diaphragm is coated with the slurry, the heat-resistant lithium battery diaphragm is obtained. The diaphragm has a relatively good liquid absorption rate, peel strength and thermal stability.

The invention particularly discloses a modified polyvinyl alcohol copolymer and a preparation method thereof, and gel polymer electrolyte containing the modified polyvinyl alcohol copolymer. The preparation method of the modified polyvinyl alcohol copolymer comprises the following steps: weighing a polyvinyl alcohol solid; adding water and swelling; after raising the temperature and dissolving, heating in a water bath at 40 DEG C to 45 DEG C; introducing argon gas and adding N-vinylpyrrolidone and a functional monomer; and after uniformly stirring, adding an acidic cerium ion solution and reacting for 3h to 5h to prepare the modified polyvinyl alcohol copolymer. The modified polyvinyl alcohol copolymer has a good electrolyte resisting performance. The neutral and alkaline gel polymer electrolyte with ideal mechanical properties and capacitive properties is prepared by taking the modified polyvinyl alcohol copolymer as a matrix material, taking glutaraldehyde or borax as a cross-linking agent and adding a proper amount of electrolyte (LiCl or LiOH); and the moisture content in gel is adjusted, and meets good application requirements in a flexible solid-state super-capacitor.

The invention discloses an aluminum-plastic composite film for a lithium ion battery soft package and a manufacturing method of the aluminum-plastic composite film. A surface protecting layer, a heat-conductive material layer, an upper adhesion layer, an upper passivation barrier layer, an aluminum film layer, a lower passivation barrier layer, a lower adhesion layer and a CPP composite film layer are successively superposed on a heat-conductive aluminum-plastic film. The aluminum-plastic composite film for the lithium ion battery soft package comprises the following steps: pretreating double surfaces of a substrate material; coating a pretreated surface of the substrate material with coating; washing the surface of an aluminum foil with water; and coating the upper passivation barrier layer, the lower passivation barrier layer, the upper adhesion layer and the lower adhesion layer. The aluminum-plastic composite film for the lithium ion battery soft package has high strength, airtightness, barrier property, acid and alkali resistance and electrolyte resistance, and meanwhile, facilitates heat conduction. The aluminum foil layer and the heat-conductive material layer have the advantages of quite high stripping strength, machining property, shielding effectiveness and barrier property, good bending property and tensile property, and excellent heat conduction property.

Provided are a pouch for packing a cell such as a lithium secondary cell or a portable storage battery and a method for preparing the same. The pouch for packing a cell such as a lithium secondary cell or a portable storage battery according to the present invention has drastically improved electrolyte resistance, which is particularly required for a cell pouch, and, therefore, is capable of preventing the corrosion of the barrier layer by the electrolyte and preventing de- lamination of the sealant layer from the barrier layer. Further, the pouch for packing a cell according to the present invention it is capable of protecting the cell safely, is shaped freely, has superior barrier property, moldability, impact resistance, air(oxygen) penetration resistance, moisture permeation resistanceand piercing strength, reduces manufacturing time, improves process efficiency, reduces cost, and is lightweight.

An aqueous liquid composition contains a water-based medium containing water, chitosan and / or a chitosan derivative, and a polymeric acid, and has a pH of not higher than 4.5. The aqueous liquid composition contains low-cost materials having low environmental load, can retain adequate viscosity even when stored over a long term, and can form a functional coating film having excellent adhesiveness to a base material and superb durability, solvent resistance and waterproofness and capable of exhibiting various functions led by electrical conductivity and hydrophilicity.