Lg Energy Solution, Ltd.

So-Yeong Lee

So-Mi Jeong

Won-Sik Bae

Kyeong-Hui Bae

Jong-Yoon Lee

So-Jung Park

A separator substrate for an electrochemical device. The separator substrate has pores that are small and uniform in size, good physical strength and durability, and high dielectric breakdown voltage. Therefore, with the use of the separator substrate, the probability of short circuiting is low.

Substrate for separator of electrochemical device, separator including same, and method of forming battery cell separator

A polyolefin separator for an electrochemical device, the separator having a plurality of pores having an average pore size of 20 nm to 40 nm and a maximum pore size of 50 nm or less and including a polyolefin resin having a polydispersity index (PDI) of in a range of 2.5 to 4.2. The polyolefin separator may have a strain rate of 25% or less as measured when a tensile stress is applied at 60° C. at 15 MPa for 60 seconds, and the polyolefin separator may have a recovery time of 200 seconds or less to reach a recovery rate of 70% as measured after removing a tensile stress applied at 70° C. at 2 MPa for 180 seconds.

Polyolefin separator for an electrochemical device and electrochemical device including same

The present disclosure relates to a coating bar and a method for manufacturing a separator using the same. The coating bar according to the present disclosure may form a coating layer having an area with different thicknesses by one coating. Additionally, the method for manufacturing a separator according to the present disclosure includes forming a porous coating layer using a predetermined coating bar, to manufacture a separator including the porous coating layer having an area with different thicknesses. In particular, the present disclosure manufactures the separator having a larger thickness at the two ends than at the center, thereby avoiding a lack of adhesive strength at the two ends in a transverse direction in the adhesion between the separator and the electrode, and exhibiting uniform adhesive strength over the whole interface between the separator and the electrode.

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Daejeon, South Korea

So-Yeong Lee