A one-step molded lithium ion battery separator and preparation method and application thereof are provided. The battery separator comprises a support layer and a filler layer. The support layer comprises at least two of superfine main fiber, thermoplastic bonded fiber and first nanofiber, and the filler layer comprises at least one of inorganic fillers and third nanofiber. The lithium ion battery separator has a thickness of 19-31 μm, a maximum pore diameter of no more than 1 μm, and a heat shrinkage rate of less than 3% after treatment at 300° C. for 1 hour, and the separator still has a certain strength at a high temperature, ensuring stability and isolation of the rigid structure of the filler layer at a high temperature, satisfying requirements of the separator in terms of heat resistance, pore size and strength, having excellent comprehensive performance.

The invention discloses a method of manufacturing an electrochemical cell having a polymer separator membrane for separation of electrodes in the electrochemical cell, including providing a cathode and providing a polymer separator membrane. At least one cycle of irradiating the polymer separator membrane is performed by an energy beam under a radiation dose ranging between 50 and 200 kGy to effect a cross-linking in the polymer separator membrane. The polymer separator membrane is maintained at a temperature between 30° C. and 70° C. An anode is then provided. Subsequently, the polymer separator membrane is compressed between the cathode and the anode. An electrolyte is provided to form the electrochemical cell.

The invention discloses a method of manufacturing an electrochemical cell having a polymer separator membrane for separation of electrodes in the electrochemical cell, including providing a cathode and providing a polymer separator membrane. At least one cycle of irradiating the polymer separator membrane is performed by an energy beam under a radiation dose ranging between 50 and 200 kGy to effect a cross-linking in the polymer separator membrane. The polymer separator membrane is maintained at a temperature between 30° C. and 70° C. An anode is then provided. Subsequently, the polymer separator membrane is compressed between the cathode and the anode. An electrolyte is provided to form the electrochemical cell.

The present invention provides a separator formed by hydrolysis of a resin film. The resin film comprises a non-hydrolyzable organic polymer; and a hydrolyzable organic polymer being hydrolyzable by treatment with at least one of an acid aqueous solution, an alkaline aqueous solution and pure water, wherein the content of the hydrolyzable organic polymer ranges from 10 parts by weight to 70 parts by weight relative to 100 parts by weight of the resin film. The separator of the present invention has good ion conductivity and thus, is extremely suitable for use in various types of batteries.

A flow battery includes an electrochemical cell that has a first electrode, a second electrode spaced apart from the first electrode, and a separator layer arranged between the first electrode and the second electrode. The separator layer is formed of a polymer that has a polymer backbone with cyclic groups that are free of unsaturated nitrogen and one or more polar groups bonded between the cyclic groups.

A flow battery includes an electrochemical cell that has a first electrode, a second electrode spaced apart from the first electrode, and a separator layer arranged between the first electrode and the second electrode. The separator layer is formed of a polymer that has a polymer backbone with cyclic groups that are free of unsaturated nitrogen and one or more polar groups bonded between the cyclic groups.

A wound battery which relates to the field of batteries. The wound battery is formed by winding a battery sheet. The battery sheet is flexible and includes a flexible current collector, a positive active layer, a negative active layer, and an insulating separator which is formed on a surface of the positive active layer and/or a surface of the negative active layer, and is configured to prevent the positive active layer from directly contacting the negative active layer.

A wound battery which relates to the field of batteries. The wound battery is formed by winding a battery sheet. The battery sheet is flexible and includes a flexible current collector, a positive active layer, a negative active layer, and an insulating separator which is formed on a surface of the positive active layer and/or a surface of the negative active layer, and is configured to prevent the positive active layer from directly contacting the negative active layer.

A lithium ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a separator, and a cathode. The electrode-separator assembly has two terminal end faces or two terminal sides. The anode comprises a ribbon-shaped anode current collector having a first longitudinal edge, the cathode comprises a ribbon-shaped cathode current collector having a first longitudinal edge, and the electrode-separator assembly is enclosed in a housing. The first longitudinal edge of the anode current collector protrudes from one of the terminal end faces or terminal sides of the stack and the first longitudinal edge of the cathode current collector protrudes from the other. A contact sheet metal member is in direct contact with a respective longitudinal edge. A part of the housing serves as the contact sheet metal member and/or the contact sheet metal member forms a part of the housing enclosing the electrode-separator assembly.

An exemplary lithium-ion battery may include an anode, a cathode, and a separator between the anode and cathode. The separator may be at least partially coated with a sub-nanometer porous membrane. The battery may be a conventional battery in which the anode and cathode are at least partially submerged in an electrolytic solution. Alternatively, the battery may be a solid-state battery disposed between the anode and cathode and having a solid-state electrolyte, which may serve as the separator.