A method of producing a separator for a lithium secondary battery, the separator being interposed between a positive electrode and a negative electrode of the lithium secondary battery, includes: preparing a separator substrate; forming a ceramic coating layer by applying a first coating solution containing a ceramic material to a surface of the separator substrate; and forming a reaction layer that scatters X-rays, by applying a second coating solution containing a metal compound to an edge portion of an upper surface of the ceramic coating layer that is not in contact with the positive electrode and the negative electrode.

A method of producing a separator for a lithium secondary battery, the separator being interposed between a positive electrode and a negative electrode of the lithium secondary battery, includes: preparing a separator substrate; forming a ceramic coating layer by applying a first coating solution containing a ceramic material to a surface of the separator substrate; and forming a reaction layer that scatters X-rays, by applying a second coating solution containing a metal compound to an edge portion of an upper surface of the ceramic coating layer that is not in contact with the positive electrode and the negative electrode.

In accordance with at least selected embodiments or aspects, the present invention is directed to improved, unique, and/or complex performance lead acid battery separators, such as improved flooded lead acid battery separators, batteries including such separators, methods of production, and/or methods of use. The preferred battery separator of the present invention addresses and optimizes multiple separator properties simultaneously. It is believed that the present invention is the first to recognize the need to address multiple separator properties simultaneously, the first to choose particular multiple separator property combinations, and the first to produce commercially viable multiple property battery separators, especially such a separator having negative cross ribs.

In accordance with at least selected embodiments or aspects, the present invention is directed to improved, unique, and/or complex performance lead acid battery separators, such as improved flooded lead acid battery separators, batteries including such separators, methods of production, and/or methods of use. The preferred battery separator of the present invention addresses and optimizes multiple separator properties simultaneously. It is believed that the present invention is the first to recognize the need to address multiple separator properties simultaneously, the first to choose particular multiple separator property combinations, and the first to produce commercially viable multiple property battery separators, especially such a separator having negative cross ribs.

The purpose of the present invention is to provide a lithium secondary battery having a high energy density and an excellent cycle characteristic. The present invention relates to a lithium secondary battery equipped with a positive electrode, a negative electrode not having a negative electrode active material, a separator placed therebetween, and a fibrous or porous buffering function layer formed on the surface of the separator facing the negative electrode and having ionic conductivity. The positive electrode contains a positive electrode active material and a lithium-containing compound which causes an oxidation reaction and does not substantially cause a reduction reaction in a charge/discharge potential range of the positive electrode active material. In a particle size distribution by the laser diffraction method, the lithium-containing compound has a particle size D.sub.50 (S), which corresponds to a cumulative degree at 50%, of 1.0 μm or more and 20 μm or less and a particle size D.sub.95 (S), which corresponds to a cumulative degree at 95%, of 1.0 μm or more and 30 μm or less.

An electrode assembly including a first electrode plate, a second electrode plate and a separator between the first electrode plate and the second electrode plate. The separator includes an extension portion extending to the outside of the first electrode plate and the second electrode plate in a length direction of the electrode assembly. The extension portion is provided with a glue layer including a first bonding portion extending in a width direction of the electrode assembly. The first bonding portion is parallel to the width direction.

An electrode assembly including a first electrode plate, a second electrode plate and a separator between the first electrode plate and the second electrode plate. The separator includes an extension portion extending to the outside of the first electrode plate and the second electrode plate in a length direction of the electrode assembly. The extension portion is provided with a glue layer including a first bonding portion extending in a width direction of the electrode assembly. The first bonding portion is parallel to the width direction.

Provided is a laminate battery in which a short circuit between a negative electrode active material and a positive electrode due to expansion of the negative electrode active material during discharging is prevented.

A laminate battery includes a battery case that serves as an outer case. The laminate battery includes an inner case within a battery case 11, and the inner case is formed of a positive electrode storage case and a separator. An inside of the inner case serves as a positive electrode storage portion that stores a positive electrode. An outside of the inner case serves as a negative electrode storage portion that stores a negative electrode. The negative electrode uses a particulate negative electrode active material (e.g., zinc or zinc oxide).

Provided is a laminate battery in which a short circuit between a negative electrode active material and a positive electrode due to expansion of the negative electrode active material during discharging is prevented.

A laminate battery includes a battery case that serves as an outer case. The laminate battery includes an inner case within a battery case 11, and the inner case is formed of a positive electrode storage case and a separator. An inside of the inner case serves as a positive electrode storage portion that stores a positive electrode. An outside of the inner case serves as a negative electrode storage portion that stores a negative electrode. The negative electrode uses a particulate negative electrode active material (e.g., zinc or zinc oxide).

A power storage device includes a positive electrode and a negative electrode facing each other, a separator disposed between the positive electrode and the negative electrode, the separator being porous, and a sealing member made of a resin and sealing a space between the positive electrode and the negative electrode. The separator includes a material having a melting temperature higher than a melting temperature of a resin material of the sealing member. The separator has an edge portion sandwiched and held in the sealing member in a state where the edge portion is joined to a melted-then-solidified portion of the resin material of the sealing member.