Provided are a separator and a method for producing the same, and more particularly, a separator which may secure battery stability and has characteristics of significantly low heat shrinkage even at a high temperature and minimally increased resistance, and a method for producing the same.

The separator according to the present disclosure includes: a porous substrate; and an inorganic particle layer positioned on one or both surfaces of the porous substrate, wherein the inorganic particle layer includes inorganic particles and a rod-shaped inorganic binder.

In a non-aqueous electrolyte secondary battery according to one exemplary embodiment, a separator includes a substrate, a first filler layer containing phosphate particles and formed on at least one surface of the substrate, and a second filler layer containing inorganic particles and formed on a surface of the first filler layer on the side of the at least one surface of the substrate. The phosphate particles have a BET specific surface area of 5 m.sup.2/g or more and 100 m.sup.2/g or less.

In a non-aqueous electrolyte secondary battery according to one exemplary embodiment, a separator includes a substrate, a first filler layer containing phosphate particles and formed on at least one surface of the substrate, and a second filler layer containing inorganic particles and formed on a surface of the first filler layer on the side of the at least one surface of the substrate. The phosphate particles have a BET specific surface area of 5 m.sup.2/g or more and 100 m.sup.2/g or less.

A separator including a porous substrate layer, an intermediate layer, and a ceramic coating layer is provided. The ceramic coating layer is disposed on a side of the intermediate layer away from the porous substrate layer. The intermediate layer includes a metal oxide powder. The particle diameter of the metal oxide powder is less than the pore diameter of the porous substrate layer, and at least a portion of the metal oxide powder is embedded in the porous substrate layer. A method of preparing the separator and a lithium-ion battery including the separator are also provided.

Separators, materials, and processes for producing electrochemical cells, for example, lithium (Li) metal batteries, and electrochemical cells produced therefrom. Such a separator includes a permeable membrane formed of a first polymer that is hydrophobic and has oppositely-disposed first and second surfaces, a second polymer that is hydrophilic and is incorporated into the first surface of the first polymer so that the first surface of the first polymer is a hydrophilic surface, and a conductive composite layer on the hydrophilic surface. The composite layer contains at least one layer of a carbonaceous material and an aqueous binder that binds the carbonaceous material together and to the hydrophilic.

A method for manufacturing a separator for an electrochemical device which uses polyvinyl pyrrolidone (PVP) as a dispersing agent, and provides high dispersibility of particles and prevents aggregation of particles, even when inorganic particles having a small particle diameter is used in slurry for forming a porous coating layer. Therefore, the inorganic particles are distributed homogeneously in the porous coating layer of a finished separator. In addition, since PVP is used with a fluorinated binder resin, the separator shows improved peel strength and adhesion to an electrode. Further, a non-solvent ingredient for the fluorinated binder resin is used as a solvent for PVP, and a non-solvent ingredient for PVP is used as a solvent for the fluorinated binder resin.

A ceramic-coated battery separator having a microporous polyolefin membrane and a ceramic coating on at least one surface of the microporous polyolefin membrane, wherein the ceramic-coated separator exhibits a strain shrinkage of 0% at temperatures greater than or equal to 120 degrees Celsius is provided.

A separator for a secondary battery including a polyolefin and a separator body having a porous structure. The separator body has a difference in porosity along a thickness direction. It is possible to improve the problem of imbalance in ionic conductivity caused by differences in thickness and electrical conductivity between a positive electrode and a negative electrode.

Separator systems for electrochemical systems providing electronic, mechanical and chemical properties useful for applications including electrochemical storage and conversion. Separator systems include structural, physical and electrostatic attributes useful for managing and controlling dendrite formation and for improving the cycle life and rate capability of electrochemical cells including silicon anode based batteries, air cathode based batteries, redox flow batteries, solid electrolyte based systems, fuel cells, flow batteries and semisolid batteries. Separators include multilayer, porous geometries supporting excellent ion transport properties, providing a barrier to prevent dendrite initiated mechanical failure, shorting or thermal runaway, or providing improved electrode conductivity and improved electric field uniformity, as well as composite solid electrolytes with supporting mesh or fiber systems providing solid electrolyte hardness and safety with supporting mesh or fiber toughness and long life required for thin solid electrolytes without fabrication pinholes or operationally created cracks.

A separator includes a substrate, a first layer on the substrate, the first layer including LiFePO.sub.4 (LFP) particles, and a second layer on the substrate, the second layer including organic particles having a melting point in a range of about 100° C. to about 130° C.