This separator for a nonaqueous electrolyte secondary battery comprises a porous substrate, a heat-resistant layer that is formed on the porous substrate, and clusters of filler particles that are present in dot shapes on the surface of the heat-resistant layer. The filler particles are particles of a compound including at least one of phosphorus, silicon, boron, nitrogen, potassium, sodium, and bromine, and the transformation point at which the filler particles transform from a solid phase to a liquid phase or thermally decompose is in the range 180° C.-1000° C. This separator electrode for a nonaqueous electrolyte secondary battery can suppress heat production of the battery during a nail puncture test, while also suppressing an increase in battery resistance.

There is provided a separator for an electricity storage device, comprising a polyolefin resin microporous membrane and an inorganic porous layer arranged on at least one surface of the polyolefin resin microporous membrane, wherein the inorganic porous layer has at least one selected from the group consisting of (i) covalent bonding between inorganic particles, (ii) covalent bonding between resin binders, and (iii) covalent bonding between an inorganic particle and a resin binder, and the polyolefin resin microporous membrane comprises a silane graft-modified polyolefin, and a silane crosslinking reaction in the silane graft-modified polyolefin is initiated when the separator for an electricity storage device is brought into contact with an electrolyte solution.

There is provided a separator for an electricity storage device, comprising a polyolefin resin microporous membrane and an inorganic porous layer arranged on at least one surface of the polyolefin resin microporous membrane, wherein the inorganic porous layer has at least one selected from the group consisting of (i) covalent bonding between inorganic particles, (ii) covalent bonding between resin binders, and (iii) covalent bonding between an inorganic particle and a resin binder, and the polyolefin resin microporous membrane comprises a silane graft-modified polyolefin, and a silane crosslinking reaction in the silane graft-modified polyolefin is initiated when the separator for an electricity storage device is brought into contact with an electrolyte solution.

A disclosed method of manufacturing a battery includes the steps of: (A) suction-attaching a first separator and a second separator to a winding core, with the first separator and the second separator being stacked on each other; and (B) winding the first separator and the separator around the winding core. Each of the first separator and the second separator includes a porous substrate layer made of resin, and at least one surface layer formed on at least one surface of the substrate layer.

A disclosed method of manufacturing a battery includes the steps of: (A) suction-attaching a first separator and a second separator to a winding core, with the first separator and the second separator being stacked on each other; and (B) winding the first separator and the separator around the winding core. Each of the first separator and the second separator includes a porous substrate layer made of resin, and at least one surface layer formed on at least one surface of the substrate layer.

The present application provides an organic-inorganic hybrid complex which can be used in a coating of a separator for a secondary battery, wherein the organic-inorganic hybrid complex is formed from basic units represented by formula (I) being periodically assembled in at least one spatial direction: [L.sub.x-i□i][M.sub.aC.sub.b].A.sub.z (I), wherein a defect percentage expressed in i/x*100% is 1% to 30%. The present application further provides a coating composition comprising the organic-inorganic hybrid complex, a coating formed from the coating composition, a separator comprising the coating for a secondary battery, a secondary battery comprising the separator, a battery module, a battery pack and a device. By applying the organic-inorganic hybrid complex of the present application in a coating, the electrolyte infiltration of a separator for a secondary battery is improved while increasing the electrolyte retention rate, thereby improving the rate capability and cycling life of the secondary battery.

The present application provides an organic-inorganic hybrid complex which can be used in a coating of a separator for a secondary battery, wherein the organic-inorganic hybrid complex is formed from basic units represented by formula (I) being periodically assembled in at least one spatial direction: [L.sub.x-i□i][M.sub.aC.sub.b].A.sub.z (I), wherein a defect percentage expressed in i/x*100% is 1% to 30%. The present application further provides a coating composition comprising the organic-inorganic hybrid complex, a coating formed from the coating composition, a separator comprising the coating for a secondary battery, a secondary battery comprising the separator, a battery module, a battery pack and a device. By applying the organic-inorganic hybrid complex of the present application in a coating, the electrolyte infiltration of a separator for a secondary battery is improved while increasing the electrolyte retention rate, thereby improving the rate capability and cycling life of the secondary battery.

Articles and methods including layers for protection of electrodes in electrochemical cells are provided. As described herein, a layer, such as a protective layer for an electrode, may comprise a plurality of particles (e.g., crystalline inorganic particles, amorphous inorganic particles). In some aspects, at least a portion of the plurality of particles (e.g., inorganic particles) are fused to one another. For instance, in some aspects, the layer may be formed by aerosol deposition or another suitable process that involves subjecting the particles to a relatively high velocity such that fusion of particles occurs during deposition. In some cases, the protective layer may be porous.

Articles and methods including layers for protection of electrodes in electrochemical cells are provided. As described herein, a layer, such as a protective layer for an electrode, may comprise a plurality of particles (e.g., crystalline inorganic particles, amorphous inorganic particles). In some aspects, at least a portion of the plurality of particles (e.g., inorganic particles) are fused to one another. For instance, in some aspects, the layer may be formed by aerosol deposition or another suitable process that involves subjecting the particles to a relatively high velocity such that fusion of particles occurs during deposition. In some cases, the protective layer may be porous.

A separator for a lithium-sulfur battery and a lithium-sulfur battery including the same are provided. More particularly, a separator for a lithium-sulfur battery including a porous substrate; and a coating layer present on at least one surface of the porous substrate, wherein the coating layer includes a polymer including a main chain, with a functional group having a non-covalent electron pair present in the main chain and a side chain with an aromatic hydrocarbon group present in the side chain.