Lg Energy Solution, Ltd.

Lg Chem, Ltd

Min-Ji Gu

Dong-Wook Sung

Kwan-Woo Nam

A separator and an electrochemical device including the same. The separator includes: a porous substrate having a plurality of pores; and a first porous coating layer and a second porous coating layer formed on one surface and the other surface of the porous substrate, respectively, and including a plurality of inorganic particles, a binder polymer disposed on a part or the whole of the surface of the inorganic particles so that the inorganic particles are connected and fixed with each other, and an anionic surfactant, wherein the inorganic particles include boehmite particles and non-boehmite particles, and the boehmite particles and the binder polymer are present at a weight ratio of 1:1-1:5.

Separator and electrochemical device including the same

Disclosed are a separator and an electrochemical device including the same. The separator includes: a porous substrate having a plurality of pores; and a pair of porous coating layers formed on at least one surface of the porous substrate, and including a plurality of inorganic particles and a binder disposed partially or totally on the surface of the inorganic particles to connect and fix the inorganic particles with each other, wherein the binder is used in an amount of 5-40 wt % based on the total weight of the porous coating layer, the inorganic particles include boehmite particles, the binder includes a fluorine-based binder and a rubber-based binder, and the fluorine-based binder and the rubber-based binder are used at a weight ratio of 80:20-99.9:0.1.

Disclosed are a separator and an electrochemical device including the same. The separator includes: a porous substrate having a plurality of pores; and a pair of porous coating layers formed on both surfaces of the porous substrate, and including a plurality of inorganic particles and a binder polymer disposed partially or totally on the surface of the inorganic particles to connect and fix the inorganic particles with each other, wherein the amount of the binder polymer and the amount of the inorganic particles in one porous coating layer are the same as those in the other porous coating layer, the binder polymer is used in an amount of 5-40 wt % based on the total weight of the porous coating layer, the inorganic particles include boehmite particles and non-boehmite particles, and the boehmite particles and the binder polymer are used at a weight ratio of 1:1-1:5.

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Daejeon, South Korea

Min-Ji Gu