Abstract: The present disclosure includes a single-layer separator for a secondary battery including 60 to 80 wt% of porous aramid substrate, 17 to 30 wt% of inorganic matter, and 3 to 10 wt% of organic binder based on a total weight of the separator. The inorganic matter and the organic binder are impregnated into a pore of the porous aramid substrate.

Abstract: Provided are a composite separator for a secondary battery, a method for producing the same, and a lithium secondary battery including the same. Specifically, a composite separator for a secondary battery showing excellent physical properties such as thermal safety and electrochemical safety and also allowing simplification of a separator production process, a method for producing the same, and a lithium secondary battery including the same are provided.

Abstract: Provided are a composite separator for a secondary battery and a lithium secondary battery including the same, and specifically, a composite separator for a secondary battery showing excellent physical properties such as thermal safety and electrochemical safety, and a lithium secondary battery including the separator are provided.

Abstract: The present invention relates to a separator including a coating layer and a substrate, wherein phase-change peak temperatures measured by differential scanning calorimetry (DSC) at the time of a first temperature increase and at the time of a second temperature increase satisfy specific ranges, a method of producing the same, and an electrochemical device including the same. More particularly, the present invention relates to a separator that has improved thermal resistance and thus may improve battery safety and implement stable movement of lithium ions and a lithium secondary battery including the same.

Abstract: A lithium secondary battery includes a plurality of electrode cells, each of which includes a first electrode, a second electrode having a different polarity from that of the first electrode and a separation layer interposed between the first electrode and the second electrode, and at least one ion permeation barrier between neighboring ones of the electrode cells. The ion permeation barrier has an air permeability less than that of the separation layer.

Abstract: Provided are a lithium secondary battery electrolyte and a lithium secondary battery. The lithium secondary battery electrolyte includes a lithium salt, a non-aqueous organic solvent, and a boron derivative. The lithium secondary battery includes a cathode, an anode, a separator, and the secondary battery electrolyte. The secondary battery electrolyte according to the present invention has advantages of excellent stability at a high temperature, high discharge capacity at a low temperature, and excellent life cycle characteristics.

Abstract: A lithium secondary battery includes a plurality of electrode cells, each of which includes a first electrode, a second electrode having a different polarity from that of the first electrode and a separation layer interposed between the first electrode and the second electrode, and at least one ion permeation barrier between neighboring ones of the electrode cells. The ion permeation barrier has an air permeability less than that of the separation layer.

Abstract: Provided are a lithium secondary battery electrolyte and a lithium secondary battery. The lithium secondary battery electrolyte includes a lithium salt, a non-aqueous organic solvent, and a boron derivative. The lithium secondary battery includes a cathode, an anode, a separator, and the secondary battery electrolyte. The secondary battery electrolyte according to the present invention has advantages of excellent stability at a high temperature, high discharge capacity at a low temperature, and excellent life cycle characteristics.