Abstract: A composite solid electrolyte including a first solid electrolyte layer including a halide solid electrolyte, a second solid electrolyte layer including an oxide solid electrolyte, a lithium ion-conductive interlayer between the first solid electrolyte layer and the second solid electrolyte layer, wherein the lithium ion-conductive interlayer includes a composition in which a reaction energy of the lithium ion-conductive interlayer with respect to the first solid electrolyte is ?50 meV/atom or greater.

Abstract: A solid electrolyte includes: a crystalline composite, wherein the composite is a compound represented by Formula 1, a compound represented by Formula 2, or a combination thereof: 3LiF-M12O3 ??Formula 1 wherein, in Formula 1, M1 is an element having an oxidation number of +3, or a combination thereof, with the proviso that M1 is not aluminum or yttrium, 3LiF-M2(OH)3 ??Formula 2 wherein, in Formula 2, M2 is an element having an oxidation number of +3, or a combination thereof, with the proviso that M2 is not aluminum or yttrium.

Abstract: Provided herein is a lithium battery including: a cathode including a cathode active material; an anode including an anode active material; an electrolyte between the cathode and the anode; and a separator impregnated with the electrolyte, wherein the separator includes cellulose nanofibers, and wherein a differential scanning calorimetry (DSC) thermogram of the separator evinces an exothermic reaction peak, represented by a differential value (dH/dT), at a temperature in a range of about 150° C. to about 200° C.

Abstract: A solid ion conductor including a garnet-type oxide represented by Formula 1, a solid electrolyte including the solid ion conductor, an electrochemical device including the ion conductor, and a method of preparing the ion conductor are disclosed. LiAM1BLaCM2DZrEM3FM4GOHXI??Formula 1 In Formula 1, M1 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof, M2 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof, M3 is a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, a hexavalent cation, or a combination thereof, M4 is Ir, Ru, Mn, Sn, or a combination thereof, X is a monovalent anion, a divalent anion, a trivalent anion, or a combination thereof, and 6?A?8, 0?B<2, 2.8?C?3, 0?D?0.2, 0<E<2.0, 0<F<2.0, 0<G?0.2, 9?H?12, and 0?I?2 are satisfied.

Abstract: Provided herein is a lithium battery including: a cathode including a cathode active material; an anode including an anode active material; an electrolyte between the cathode and the anode; and a separator impregnated with the electrolyte, wherein the separator includes cellulose nanofibers, and wherein a differential scanning calorimetry (DSC) thermogram of the separator evinces an exothermic reaction peak, represented by a differential value (dH/dT), at a temperature in a range of about 150° C. to about 200° C.

Abstract: A solid-state ion conductor includes a compound of Formula 1: Li3a+b?(c*N)NaClbXc??Formula 1 wherein, in Formula 1, X is an anion having an average oxidation state of n and is ?3>n??1, and is at least one of Br, I, F, O, S, or P; and 1?a?4, 1?b?3, 0?c?3, and 4.8?(a+b+c)?5.2.

Abstract: An oxide includes a compound represented by Formula 1, a compound represented by Formula 2, or a combination thereof: Li1?x+y?zTa2?xMxP1?yQyO8?zXz??Formula 1 wherein, in Formula 1, M is an element having an oxidation number of 5+ or 6+, Q is an element having an oxidation number of 4+, X is a halogen atom, a pseudohalogen, or a combination thereof, 0?x<0.6, 0?y<1, and 0?z<1, wherein x and y are not 0 at the same time, Li1?x+yTa2?xMxP1?yQyO8.zLiX??Formula 2 wherein, in Formula 2, M is an element having an oxidation number of 5+ or 6+, Q is an element having an oxidation number of 4+, X is a halogen atom, a pseudohalogen or a combination thereof, 0?x<0.6, 0?y<1, and 0?z<1, wherein x and y are not 0 at the same time, and wherein in Formulas 1 and 2, M, Q, x, y, and z are independently selected.

Abstract: A solid ion conductor compound includes a compound represented by Formula 1: Li6?wHf2?xMxO7?yZy??Formula 1 where, in Formula 1, M is an element having an oxidation number of a and a is 5, 6, or a combination thereof, Z is an element having an oxidation number of ?1, and 0<x<2, 0?y?2, and 0<w<6 and w=[(a?4)×x]+y.

Abstract: Provided herein are a porous film, a separator including the same, an electrochemical device including the separator, and a method of preparing the porous film. The porous film includes first cellulose nanofibers which is impregnated with a carbonate-based solvent-containing electrolyte solution and has a reaction heat of 150 J/g or less at a temperature ranging from about 30° C. to about 300° C., as measured by differential scanning calorimetry (DSC).

Abstract: A solid electrolyte including a compound represented by Formula 1 or 3, the compound having a glass transition temperature of ?30° C. or less, and a glass or glass-ceramic structure, AQX-Ga1-zMz1(F1-kClk)3-3zZ3z1??Formula 1 wherein, in Formula 1, Q is Li or a combination of Li and Na, K, or a combination thereof, M is a trivalent cation, or a combination thereof, X is a halogen other than F, pseudohalogen, OH, or a combination thereof, Z is a monovalent anion, or a combination thereof, 1<A<5, 0?z?1, 0?z1?1, and 0?k<1, AQX-aMz1Z3z1-bGa1-z(F1-kClk)3-3z??Formula 3 wherein, in Formula 3, Q is Li or a combination of Li and Na, K, or a combination thereof; M is a trivalent cation, or a combination thereof, X is a halogen other than F, pseudohalogen, OH, or a combination thereof, Z is a monovalent anion, or a combination thereof, 0<a?1, 0<b?1, 0<a+b, a+b=4?A, 1<A<5, 0?z<1, 0?z1?1, and 0?k<1.

Abstract: An all-solid secondary battery, including: a cathode; an anode; and a solid electrolyte layer disposed between the cathode and the anode, wherein the anode comprises an anode current collector; a first anode active material layer in contact with the anode current collector and comprising a first metal; a second anode active material layer disposed between the first anode active material layer and the solid electrolyte layer and comprising a carbon-containing active material; and a contact layer between the second anode active material layer and the solid electrolyte layer, and disposed such that the contact layer prevents contact between the second anode active material layer and the solid electrolyte layer, wherein the contact layer comprises a second metal, and has a thickness less than a thickness of the first anode active material layer.

Abstract: A composite solid electrolyte including: a porous nanostructure; and a solid electrolyte disposed on a surface of the porous nanostructure, wherein the composite solid electrolyte satisfies Equation 1 0<TSE/D<4??Equation 1 wherein TSE is a thickness of the solid electrolyte, and D is an average diameter of pores of the porous nanostructure.

Abstract: An all-solid secondary battery including: a cathode layer including a cathode active material; an anode layer; and a solid electrolyte layer including a solid electrolyte disposed between the cathode layer and the anode layer, wherein the anode layer includes an anode current collector, a first anode active material layer in contact with the solid electrolyte layer, and a second anode active material layer disposed between the anode current collector and the first anode active material layer, wherein the first anode active material layer includes a first metal and has a lithium-ion reduction potential greater than a reduction potential of the solid electrolyte, and wherein the second anode active material layer includes a second metal, and a solid solubility of lithium (Li) in the second metal is greater than a solid solubility of lithium in the first metal.

Abstract: An oxide including a compound represented by Formula 1: (LixM1y)(M2)3-?(M3)2-?O12-zXz ??Formula 1 wherein, in Formula 1, 6?x?8, 0?y<2, ?0.2???0.2, ?0.2???0.2, and 0?z?2; M1 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof; M2 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof; M3 is a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, a hexavalent cation, or a combination thereof; wherein at least one of M1, M2, or M3 includes at least four elements; and X is a monovalent anion, a divalent anion, a trivalent anion, or a combination thereof.

Abstract: A solid conductor including: a compound represented by Formula 1, a compound represented by Formula 2, or a combination thereof Li1+x+y?zTa2-xMxP1-yQyO8-zXz ??Formula 1 wherein, in Formula 1, M is an element having an oxidation number of +4, Q is an element having an oxidation number of +4, X is a halogen, a pseudohalogen, or a combination thereof, and 0?x?2, 0?y<1, and 0?z?2, except that cases i) x and y and z are simultaneously 0, ii) M is Hf, X is F, x is 1 , y is 0, and z is 1, iii) M is Hf, X is Cl, x is 2, y is 0, and z is 2, and iv) M is Hf, X is F, x is 2, y is 0, and z is 2, Li1+x+y?zTa2-xMxP1-yQyO8-zLiX ??Formula 2 wherein, in Formula 2, M is an element having an oxidation number of +4, Q is an element having an oxidation number of +4, X is a halogen, a pseudohalogen, or a combination thereof, and 0)(2, 0y<1, and 0z2, except that cases i) x and y and z are simultaneously 0, ii) M is Hf, X is F, x is 1 , y is 0, and z is 1, iii) M is Hf, X is Cl, x is 2, y is 0, and z is

Abstract: A positive electrode includes a composite material including a positive active material and a coating layer on a surface of the positive active material, wherein the coating layer includes a copolymer including a first repeating unit represented by Formula 1 below and a second repeating unit represented by Formula 2 below: wherein Ar1, R1 to R6, A, A1, Y?, m, and n are the same as defined in the specification.

Abstract: A porous film comprising a Lewis base and nanofibers comprising cellulose or a derivative thereof, a separator comprising the porous film, and an electrochemical device comprising the separator or porous film are provided. The electrochemical device comprising the separator comprising the porous film may have improved thermal stability, and thus deterioration of the electrochemical device may be inhibited.

Abstract: Provided herein is a lithium battery including: a cathode including a cathode active material; an anode including an anode active material; an electrolyte between the cathode and the anode; and a separator impregnated with the electrolyte, wherein the separator includes cellulose nanofibers, and wherein a differential scanning calorimetry (DSC) thermogram of the separator evinces an exothermic reaction peak, represented by a differential value (dH/dT), at a temperature in a range of about 150° C. to about 200° C.

Abstract: Provided herein are a porous film, a separator including the same, an electrochemical device including the separator, and a method of preparing the porous film. The porous film includes first cellulose nanofibers which is impregnated with a carbonate-based solvent-containing electrolyte solution and has a reaction heat of 150 J/g or less at a temperature ranging from about 30° C. to about 300° C., as measured by differential scanning calorimetry (DSC).