Disclosed is a method for producing a lithium secondary battery including forming an electrode assembly using a cathode, an anode and a separator, introducing the electrode assembly into a battery case, injecting an electrolyte into the battery case, and sealing the battery case, wherein, during assembly of the electrode assembly, insulating particles are dispersed on part of the surface of the separator, or at least one of the cathode and the anode contacting the separator. The step of dispersing insulating particles on the part of the surface of the separator or at least one of the cathode and the anode contacting the separator during battery assembly can considerably reduce short-circuits in a lithium secondary battery caused by intrinsic and extrinsic factors and thus low-voltage defects, and thereby significantly improve yield of a lithium secondary battery.

The separator of a nonaqueous electrolyte secondary battery is characterized by having a composite nanofiber fiber which is a nanosize fiber that contains two or more kinds of aqueous resins whose melting points are different.

Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.

A method of producing a cellulose nonwoven fabric, a cellulose nonwoven fabric produced thereby, and a secondary ion battery including the same, wherein the method includes passing a cellulose suspension with microbial cellulose and a water-soluble cellulose disintegrating agent in a medium through an orifice of a high-pressure homogenizer to obtain a cellulose dispersion and removing the medium from the obtained cellulose dispersion to form the nonwoven fabric.

Provided are a heat-resistant synthetic resin microporous film that has both good heat resistance and good mechanical strength and exhibits a suppressed decrease in mechanical strength over time, and a method for producing the heat-resistant synthetic resin microporous film. The heat-resistant synthetic resin microporous film of the present invention includes a synthetic resin microporous film, and a coating layer formed on at least part of the surface of the synthetic resin microporous film and containing a polymer of a polymerizable compound having two or more radically polymerizable functional groups per molecule. The maximum thermal shrinkage rate of the heat-resistant synthetic resin microporous film when heated from 25° C. to 180° C. at a temperature rising rate of 5° C./min is 15% or less. The piercing strength thereof is 0.6 N or more. The rate of retention of the piercing strength after heating at 70° C. for 168 hours is 85% or more.

A polyolefin microporous membrane is suitable to provide thereon a porous layer having little variation in thickness, which has a fluctuation range of F25 value in the length direction of 1 MPa or less, and which has a length of 1,000 m or more (wherein the F25 value refers to a value obtained by: measuring a load value applied to a test specimen when the test specimen is stretched by 25% using a tensile tester; and dividing the load value by the value of the cross-sectional area of the test specimen).

The present invention relates to a unit cell for a solid-oxide fuel cell and to a solid-oxide fuel cell using same, and, more specifically, relates to: a unit cell for a solid-oxide fuel cell, wherein a fuel charging-and-discharging part and an air charging-and-discharging part are provided perpendicularly to a cathode comprised in the solid-oxide fuel cell; and a solid-oxide fuel cell using same.

A coated method for the preparation of a separator comprising multiple layers of glass or glass and ceramic particles for use in an electrochemical cell, an electrochemical cell comprising such a separator and the use of such an electrochemical cell. The method comprises the steps of providing a mixture of an organic polymeric material, glass or glass and ceramic particles and at least one solvent, and preparing a multilayer by phase inversion.

A method of manufacturing a nonaqueous electrolyte secondary battery includes: preparing a separator substrate; forming a porous layer, which contains at least a fluorophosphate and a binder, on a surface of the separator substrate; preparing an electrode body by laminating a positive electrode and a negative electrode to face each other with a separator including the porous layer interposed therebetween, in which the separator is arranged such that the porous layer faces the positive electrode; preparing a battery assembly including the electrode body and a nonaqueous electrolyte; and charging the battery assembly at least once.

An object of the present invention is to provide a filler-containing resin film in which shedding of inorganic materials or the like is suppressed, a resin composition that can be used in production of the filler-containing resin film, and a method for producing the filler-containing resin film. The filler-containing resin film of the present invention is a filler-containing resin film comprising: a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) (in formula (1), R.sup.1, R.sup.2, and R.sup.3 are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X′ is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms); and an insulating inorganic filler. The resin film is produced by applying onto a substrate and then drying a resin composition containing the vinylidene fluoride copolymer, the insulating inorganic filler, and an organic solvent.

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