A separator is provided which includes: a separator base including a porous polymer substrate having a plurality of pores, and a porous coating layer positioned on at least one surface of the porous polymer substrate and containing a plurality of inorganic particles and a binder polymer positioned on the whole or a part of the surface of the inorganic particles to connect the inorganic particles with one another and fix them; and a porous adhesive layer positioned on at least one surface of the separator base and including polyvinylidene fluoride-co-hexafluoropropylene containing vinylidene fluoride-derived repeating units and hexafluoropropylene-derived repeating units, wherein the ratio of the number of the hexafluoropropylene (HFP)-derived repeating units (HFP substitution ratio) based on the total number of the vinylidene fluoride-derived repeating units and the hexafluoropropylene-derived repeating units is 4.5% to 9%. An electrochemical device including the separator is also provided.

The invention provides a contact surface adjusting material for solid electrolytes and composite electrolyte system thereof. The contact surface adjusting material is mainly composed of a polymer base material, which is capable of allowing metal ions to move inside the material, and an additive, which is capable of dissociating metal salts and is served as a plasticizer. The contact surface adjusting material is applied to a surface of the solid electrolytes to construct a face-to-face transmission mode. Therefore, the problems of the high resistances caused by the directly contact of the solid electrolytes are eliminated.

Provided are separators for use in an electrochemical cell comprising (a) an inorganic oxide and (b) an organic polymer, wherein the inorganic oxide comprises organic substituents. Also provided are electrochemical cells comprising such separators.

Provided are separators for use in an electrochemical cell comprising (a) an inorganic oxide and (b) an organic polymer, wherein the inorganic oxide comprises organic substituents. Also provided are electrochemical cells comprising such separators.

A porous film, including a binder and inorganic particles. The porous film includes pores formed by the binder. The pores at least include a part of the inorganic particles. The inorganic particles have particle sizes that Dv10 is in a range of 0.015 μm to 3 μm, Dv50 is in a range of 0.2 μm to 5 μm, and Dv90 is in a range of 1 μm to 10 μm. Dv10 of the inorganic particles is less than Dv50 of the inorganic particles, and Dv50 of the inorganic particles is less than Dv90 of the inorganic particles, and the inorganic particles have particle sizes that the ratio of Dv90 to Dv10 is in a range of 2 to 100.

An aspect of the present application provides a separator comprising a porous substrate, and a first coating layer disposed on at least one surface of the porous substrate and comprising an inorganic particle and a binder. The first coating layer comprises a first region and a second region, the first coating layer in the first region comprises a first thickness, and the first coating layer in the second region comprises a second thickness; the first thickness is greater than the second thickness, and the area in the second region is greater than the area in the first region. Another aspect of the present application provides a lithium ion battery comprising a positive electrode, a negative electrode and the above separator. The purpose of the present application is to provide a separator having an increased thickness in a partial coating layer and a lithium ion battery comprising the above separator.

A separator for a secondary battery including a porous separator substrate including a polymer; and a coating layer on at least one surface of the porous separator substrate. The coating layer includes a crystalline first binder and a noncrystalline second binder. The crystalline first binder and the noncrystalline second binder are independently an aqueous emulsion type binder, thereby ensuring adhesion strength between the separator and a positive electrode and between the separator and a negative electrode even in the presence of an electrolyte solution.

A separator for a secondary battery including a porous separator substrate including a polymer; and a coating layer on at least one surface of the porous separator substrate. The coating layer includes a crystalline first binder and a noncrystalline second binder. The crystalline first binder and the noncrystalline second binder are independently an aqueous emulsion type binder, thereby ensuring adhesion strength between the separator and a positive electrode and between the separator and a negative electrode even in the presence of an electrolyte solution.

A coating solution for lithium ion battery separators which comprises inorganic particles, an organic polymer binder and carboxymethyl cellulose having an etherification rate of 1.10 to 2.00 or a salt thereof, or a coating solution for lithium ion battery separators comprising inorganic particles containing magnesium hydroxide having a linseed oil absorption of 30 to 80 (g/100 g), and a separator having a coating layer formed from the coating solution on a substrate and high safety and low internal resistance.

A separator for a lithium secondary battery comprising a porous polymer substrate and a porous coating layer on at least one surface of the porous polymer substrate. The separator has an ionic conductivity of 4.75×10.sup.−5 S/cm or more, and the porous coating layer comprises an interstitial volume and a macro pore having a larger diameter than the interstitial volume. A method for manufacturing the separator is also disclosed. Accordingly, the separator has significantly improved ionic conductivity over commercial separators.