Abstract: The present application relates to a composite polyester film and a preparation method therefor and a use thereof. The composite polyester film comprises: an intermediate layer, and a first outer layer and a second outer layer respectively located on two opposite surfaces of the intermediate layer; the intermediate layer comprises the following components in parts by mass: 96.0-99.4 parts of a polyester and 0.5-3 parts of an oxygen-containing functional group modified polyester; the first outer layer comprises the following components in parts by mass: 79.0-94.9 parts of the polyester and 5-20 parts of the oxygen-containing functional group modified polyester; and the second outer layer comprises the following components in parts by mass: 79.0-94.9 parts of the polyester and 5-20 parts of the oxygen-containing functional group modified polyester.

Abstract: The present application relates to a high mechanical strength polymer thin film. The high mechanical strength polymer thin film comprises, by mass percentage, 95%-99% of polyester and 1%-5% of an auxiliary agent. The number average molecular weight of the polyester is 13000 Da to 20000 Da. The molecular number of the polyester with the molecular weight smaller than 5000 Da accounts for 0.5%-5% of the total molecular number of the polyester. A molecular weight distribution index of the polyester is 1.6-2.4.

Abstract: Disclosed herein are a polymer film, a method for preparing the same, and a composite current collector comprising the same. The polymer film preparation method comprises soaking, washing, and heat treatment, wherein a polymer film is subjected to a crosslinking treatment with a crosslinking agent to improve its tensile strength and heat resistance.

Abstract: The present invention is directed to improved, new or modified membranes, separator membranes, or separators, and/or related methods. In accordance with at least certain embodiments, the present invention is directed to improved, new or modified nonporous, porous, or microporous battery separator membranes or separators and/or related methods of manufacture and/or use of such membranes or separators. In accordance with at least selected embodiments, the present invention is directed to improved, new or modified nonporous, porous, or microporous battery separator membranes or separators for lithium ion batteries and/or related methods of manufacture and/or use thereof. In accordance with at least selected particular embodiments, the present invention is directed to improved, new or modified nonporous, porous, or microporous battery separator membranes or separators for secondary or rechargeable lithium ion batteries and/or related methods of manufacture and/or use of such membranes or separators.

Abstract: The present disclosure relates to the technical field of film material, and particularly to a polymeric polyphenol-modified polymer film, a preparation method thereof and a metallized polymer film. According to the present disclosure, corona treatment is performed to a surface of a polymer layer, so that a polar modifying liquid can uniformly coat the surface of the polymer layer, thereby forming a modification layer tightly combined with the polymer layer. Thus, the low-polarity polymer layer surface can be imparted with a durable high polarity. Consequently, the polymer layer is capable of being stably and tightly bonded to a material layer with high polarity and high surface tension, such as a metal layer, for a long period of time, effectively broadening the application scenarios for non-polar polymer substrate layers.

Abstract: A ceramic-coated battery separator having a microporous polyolefin membrane and a ceramic coating on at least one surface of the microporous polyolefin membrane, wherein the ceramic-coated separator exhibits a strain shrinkage of 0% at temperatures greater than or equal to 120 degrees Celsius is provided.

Abstract: Provided are a polyester base film, a preparation method therefor and an application thereof, a pole piece, and a lithium battery cell. The material of the polyester base film comprises a polyester derivative, the polyester derivative being a derivative obtained by partially replacing original diol monomers in the corresponding polyester with diol monomers containing polar groups, the polar groups comprising one or more selected from amide groups and amine groups. The polyester derivative is used as the material to prepare the polyester base film, increasing the polar group content of the polyester base film, and improving the surface tension of the polyester base film. In addition, the surface tension of the polyester base film can be stable for a long time, effectively promoting the strong integration of the polyester base film and a surface metal layer.

Abstract: The present invention relates to a current collector having multiple layers of structures and a preparation method therefor. The current collector having the multiple layers of structures comprises a polymer film layer, wherein two surfaces of the polymer film layer that face away from each other are respectively provided with stacked layers, and each stacked layer comprises carbon coatings and metal coatings, which are alternately laminated.

Abstract: The present application relates to the technical field of batteries, and in particular, to a current collector, and a preparation method therefor and an application thereof the current collector includes a fiber base layer, in which a first bonding layer and a second bonding layer are respectively arranged on surfaces on two sides of the fiber base layer, a first metal layer and a second metal layer are respectively arranged on the surfaces of the first bonding layer and the second bonding layer away from the fiber base layer, and material composition of the fiber base includes the following components in parts by weight. Based on this, the current collector provided according to the present application can prevent a metal layer from peeling off while realizing the light weight of a battery.

Abstract: A composite current collector and preparation method therefor, electrode plate and secondary battery. The current collector comprises a polymer base membrane, and aluminum-plated layers, which are arranged on surfaces of two sides of the polymer base membrane. The aluminum-plated layer comprises a first sub-layer and a second sub-layer; the first sub-layer is closer to the polymer base membrane than the second sub-layer; and the particle size of aluminum particles in the first sub-layer is 10 nm to 30 nm, and the particle size of aluminum particles in the second sub-layer is 80 nm to 100 nm. The current collector not only has relatively high conductivity, but also has relatively high surface energy; and during a coating process of an active substance, the interface internal resistance between a battery electrode plate and a current collector can be significantly improved, thereby improving the capacity and cycling performance of a lithium battery.

Abstract: The present application relates to a lithium-rich composite current collector for use in a positive electrode and a method for preparing the same. The lithium-rich composite current collector includes a polymer layer, two deposited aluminum layers, and two lithium-rich layers, wherein the two deposited aluminum layers are respectively disposed on two opposite surfaces of the polymer layer; and the two lithium-rich layers are respectively disposed on surfaces of the two deposited aluminum layers away from the polymer layer. By disposing the deposited aluminum layers and the lithium-rich layers on the surfaces of the polymer layer, the lithium-rich composite current collector has relatively high strength and ductility.

Abstract: A composite current collector and a preparation method therefor, and an electrode plate and a secondary battery. The composite current collector has a porous polymer film and aluminum-plated layers, which are arranged on surfaces of two sides of the porous polymer film. The pore diameter D50 of the porous polymer film is less than or equal to 60 nm, and the porosity thereof is less than 80%. In the process of manufacturing a lithium battery, after the composite current collector is subjected to a rolling process, cases of electrode plate breakage are significantly reduced, and the unit weight of the composite current collector is reduced, thereby significantly improving the energy density of the battery.

Abstract: Provided are a copper plating additive composition, a copper plating solution, and a copper brush plating method using the same. The copper plating additive composition includes 1,4-cyclohexanedione monoethylene acetal, potassium phthalimide, and an amino polyol compound.

Abstract: The present disclosure relates to the technical field of new materials, and in particular, to a method for preparing a composite current collector. A specific amount of copper-containing photosensitive material and a high-molecular polymer are utilized together as materials of the surface layer of the composite current collector substrate. The composite current collector substrate is prepared through co-extrusion with a material of a core layer and materials of the surface layer. Under ultraviolet irradiation, a portion of divalent copper ions is reduced to elemental copper, forming a nanoscale copper layer. Simultaneously, another portion of the copper-containing photosensitive material is activated to create seed crystals with catalytic activity for chemical copper plating. The synergy between the nanoscale copper layer and seed crystals meets square resistance requirements for chemical plating or electroplating.

Abstract: The present invention relates to the field of film materials, in particular to a modified polymer film and a preparation method therefor, and a metallized polymer film and the use thereof. By carrying out corona treatment on the surface of a polymer layer such as polyethylene, polypropylene, polyethylene terephthalate and the like, a polar modifier can be uniformly coated on the surface of the polymer layer to form a modified layer tightly combined with the polymer layer, so that a surface of a low-polarity polymer layer is endowed with a lasting high polarity and correspondingly high surface tension, and thus can stably and tightly combine with a metal layer and other high-polarity high-surface-tension material layers for a long time, effectively expanding usage scenarios of a non-polar polymer substrate layer. The preparation method features a simple and feasible treatment process, low cost, high treatment efficiency and easy expansion.

Abstract: Disclosed herein is a composite current collector, a manufacturing method thereof, an electrode and a lithium-ion battery comprising the composite current collector. The composite current collector comprises: a first porous conductive sheet, a substrate sheet, and a second porous conductive sheet that are laminated in sequence, and the first porous conductive sheet and the second porous conductive sheet comprise amorphous micropores throughout the porous conductive sheets, the substrate sheet is made of a high molecular non-conductive material, and the first porous conductive sheet and the second porous conductive sheet are in conduction with each other in the electrode tab area.

Abstract: A ceramic-coated battery separator having a microporous polyolefin membrane and a ceramic coating on at least one surface of the microporous polyolefin membrane, wherein the ceramic-coated separator exhibits a strain shrinkage of 0% at temperatures greater than or equal to 120 degrees Celsius is provided.

Abstract: A ceramic-coated battery separator having a microporous polyolefin membrane and a ceramic coating on at least one surface of the microporous polyolefin membrane, wherein the ceramic-coated separator exhibits a strain shrinkage of 0% at temperatures greater than or equal to 120 degrees Celsius is provided.

Abstract: A ceramic-coated battery separator having a microporous polyolefin membrane and a ceramic coating on at least one surface of the microporous polyolefin membrane, wherein the ceramic-coated separator exhibits a strain shrinkage of 0% at temperatures greater than or equal to 120 degrees Celsius is provided.

Abstract: A battery separator for a secondary lithium battery includes a microporous/porous membrane with a ceramic coating of one or more layers, a layer may include one or more particles having an average particle size ranging from 0.01 ?m to 5 ?m and/or binders that include poly (sodium acrylate-acrylamide-acrylonitrile) copolymer.