| abstract |
The present invention provides a lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte solution in which a lithium salt is dissolved in a nonaqueous solvent, And a porous coating layer formed on at least one surface of the porous substrate, wherein the porous coating layer is formed by a plurality of inorganic particles, a polymeric binder, and a polymeric binder, and the pores formed by connecting and fixing the inorganic particles to each other ≪ / RTI & Wherein the non-aqueous electrolyte comprises a lithium salt having a concentration of 0.8M to 2M and a non-aqueous solvent having a viscosity of 1.4 to 50 cP, and a high viscosity non-aqueous electrolyte having a viscosity of 3.5 cP or more at 25 캜. |