Patent ID: 7674559

Claim:
A lithium secondary battery comprising an electrode assembly having two electrodes and a separator interposed between the two electrodes and a case that contains the electrode assembly, wherein the separator comprises a binder and a filler including solid electrolyte particles having lithium ion conductivity and a non-ion-conductive ceramic powder, wherein the solid electrolyte particles and the non-ion-conductive ceramic powder are connected to each other, wherein a mass ratio of filler to binder in the separator is about 95:5 or greater, and wherein the binder does not cover entire surfaces of the solid electrolyte particles and the non-ion-conductive ceramic powder, wherein the solid electrolyte particles include at least one composition selected from the group consisting of LiCl—Li 2 O—P 2 O 5 , LiTi 2 (PO 4 ) 3 —AlPO 4 , single-crystal Li 3 N, LiI—Li 2 S—P 2 S 5 , LiI—Li 2 S—B 2 S 3 , LiI—Li 2 S—SiS 4 , Li 2 S—GeS 2 —P 2 S 5 , and La(0.55)-Li(0.35)-TiO 3 , or a combination thereof.