This invention relates to a waterborne fluoropolymer composition useful for the fabrication of Li-ion-Battery (LIB) electrodes. The fluoropolymer composition contains an organic carbonate compound, which is more environmentally friendly than other fugitive adhesion promoters currently used in waterborne fluoropolymer binders. An especially useful organic carbonate compound is ethylene carbonate (EC) and vinylene carbonate (VC), which are solids at room temperature, and other carbonates which are liquid at room temperature such as propylene carbonate, methyl carbonate and ethyl carbonate. The composition of the invention is low cost, environmentally friendly, safer, and has enhanced performance compared to current compositions.

A battery is provided. The battery includes a positive electrode; a negative electrode; and a separator; wherein the separator comprises a base which is formed from a non-woven fabric, and a surface layer which is formed on at least one of the surfaces of the base and includes a resin material and inorganic particles, and the separator is formed by a pressurizing process being carried out on at least one of the surfaces of the surface layer, a thickness of the base is 12 μm or more and 30 μm or less, an average particle diameter of primary particles of the inorganic particles is 0.3 μm or more and 0.8 μm or less, a thickness of the surface layer is 1 μm or more and 10 μm or less.

A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 μm or less, and the adhesive porous layer satisfying Inequality (1): 0.5≦a/r≦3.0, wherein, in Inequality (1), “a” represents an average thickness (μm) of the adhesive porous layer on one of the sides of the porous substrate; and “r” represents a volume average particle diameter (μm) of the filler contained in the adhesive porous layer.

The following disclosure relates to a microporous polyolefin composite film having excellent heat resistance and thermal stability, and a method for manufacturing the same. More particularly, the present invention relates to a microporous polyolefin composite film capable of improving stability and reliability of a battery by heat sealing an edge of a microporous film provided with a coating layer that includes a polymer binder and inorganic particles, and a method for manufacturing the same.

A polyolefin multilayer microporous membrane includes at least first microporous layers which form both surface layers of the membrane and at least a second microporous layer disposed between the both surface layers, wherein static friction coefficient of one of the surface layers of the polyolefin multilayer microporous membrane against another surface layer in a longitudinal direction (MD) is 1.1 or less, and wherein pore density calculated from an average pore radius measured by mercury porosimetry method and porosity, according to Formula (1) is 4 or more:
Pore density=(P/A.sup.3)×10.sup.4  (1)
wherein A represents the average pore radius (nm) measured by mercury porosimetry method and P represents the porosity (%).

An electric device is capable of preventing a heat-resistant material of a separator from scattering even when the electric device vibrates or receives shocks. The electric device has a power generating element formed by alternately laminating a first electrode, a second electrode of a polarity different from the first electrode with a separator interposed therebetween. The separator includes a hot-melt material and the heat-resistant material which is laminated only on one surface of the melt material and having a higher melting point than the melt material. The adjacent separators are welded or joined each other with the heat-resistant material thereof facing each other.

An object of the present invention is to provide a laminated porous film excellent in handling ability. A laminated porous film having a layer containing a polymer other than a polyolefin laminated on at least one surface of a polyolefin porous film, wherein the uplift quantity of a side perpendicular to the machine direction, when allowed to stand still for 1 hour under an environment of a temperature of 23° C. and a humidity of 50%, is 15 mm or less.

Provided is a lithium ion secondary battery including: a package; and a power generating element disposed in the package, the power generating element including: a positive electrode; a negative electrode; a separator; and an electrolyte solution, and the separator having a shrinkage rate of 10% or less at 150° C. obtained by a thermomechanical analysis.

The present invention relates to a method for cutting a separation membrane for a battery, in which the separation membrane is cut by laser radiation on the separation membrane, wherein the pulse repetition rate of the laser is 10 to 500 kHz; a separation membrane manufactured by the method; and a battery comprising the separation membrane. The present invention, in contrast with physical cutting, has the advantage of being capable of cutting a separation membrane for a battery so as to have a uniform cut surface, which was impossible by conventional physical cutting methods.

The patent application relates generally to a thermal isolation material, more particularly to a thermal isolation material having at least an intumescent layer and a refractory layer. The intumescent and refractory layers are generally stacked on top of one other. The patent application also generally relates to a method of making the thermal isolation material that includes the steps of providing a substrate having opposing first and second sides, applying an intumescent material to the substrate and applying a refractory material to the substrate to form a thermal isolation material, where the one following can be true: (i) the intumescent material is applied on the first side and wherein the refractory material is applied on the second side; (ii) the intumescent material is positioned between the substrate and the refractory material and (ii) the refractory material is positioned between the substrate and the intumescent material.