Abstract: A solid ion conductor compound including Li, Ho, and a halogen element, wherein the compound has diffraction peaks at 30°2? to 33°2?, 33°2? to 36°2?, 40°2? to 44°2?, and 48°2? to 52°28?, when analyzed using CuK? radiation, and wherein a full width at half maximum of at least one peak at 40°2? to 44°2? is 0.3°2? or greater.

Abstract: A solid electrolyte for an all-solid secondary battery, the solid electrolyte including: Li, S, P, an M1 element, and an M2 element, wherein the M1 element is at least one element selected from Na, K, Rb, Sc, Fr, and the M2 element is at least one element selected from F, Cl, Br, I, molar amounts of lithium and the M1 element satisfy 0<M1/(Li+M1)?0.07, and the solid electrolyte has peaks at positions of 15.42°±0.50° 2?, 17.87° degrees±0.50° degrees 2?, 25.48° degrees±0.50° degrees 2?, 30.01° degrees±0.50° 2?, and 31.38°±0.50° 2? when analyzed by X-ray diffraction using CuK? radiation.

Abstract: A method of preparing a solid electrolyte and an all-solid battery including a solid electrolyte prepared by the method, the method including: contacting a first solvent and a first starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a first solution; precipitating a first precursor from the first solution; contacting a second solvent, the first precursor, and a second starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a second solution; precipitating a second precursor from the second solution; and heat treating the second precursor to prepare the solid electrolyte, wherein the element M comprises an element of Group 14 of the Periodic Table of the Elements, and the element M and the alkali metal in the first starting material and the second starting material are the same or different.

Abstract: Disclosed herein are a solid electrolyte including a compound represented by Formula 1 below and having an argyrodite crystal structure, an electrochemical battery including the solid electrolyte, and a method of preparing the solid electrolyte. (Li1?kMk)7?(a+b)PS6?(a+b+x)OxClaBrb??<Formula 1> wherein, in Formula 1, M is sodium (Na), potassium (K), calcium (Ca), iron (Fe), magnesium (Mg), silver (Ag), copper (Cu), zirconium (Zr), zinc (Zn), or a combination thereof , and 0.5?a/b?1.5, 0<a<2, 0<b<2, 0<x?1, 0?k<1, and x<3?(a+b)/2 are satisfied.

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: 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: 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 coated cathode active material, a method of preparing the same, and a cathode and a non-aqueous electrolyte secondary battery, each including the same, the coated cathode active material including: a cathode active material particle and a coating layer on a surface of the cathode active material particle, the coating layer including LiAlF4, LiF, and Li3AlF6.

Abstract: A composite cathode active material includes a cathode active material particle; and a coating layer on a surface of the cathode active material particle, wherein the coating layer includes an acetate, wherein the acetate comprises an alkali metal acetate, an alkaline earth metal acetate, a transition metal acetate, or a combination thereof, or a derivative thereof.

Abstract: A solid electrolyte material is represented by Formula 1 (Li3?xM1x)aYbM2c??Formula 1 wherein, in Formula 1, M1 includes at least one of Na, K, Rb, Cs, or Fr, M2 includes at least one of F, Cl, Br, or I, 0<x<3, 0.9?a?1.1, 0.9?b?1.1, and 5?c?7.

Abstract: A solid electrolyte for an all-solid secondary battery, the solid electrolyte including: Li, S, P, an M1 element, and an M2 element, wherein the M1 element is at least one element selected from Na, K, Rb, Sc, Fr, and the M2 element is at least one element selected from F, Cl, Br, I, molar amounts of lithium and the M1 element satisfy 0<M1/(Li+M1)?0.07, and the solid electrolyte has peaks at positions of 15.42°±0.50° 2?, 17.87° degrees±0.50° degrees 2?, 25.48° degrees±0.50° degrees 2?, 30.01° degrees±0.50° 2?, and 31.38°±0.50° 2? when analyzed by X-ray diffraction using CuK? radiation.

Abstract: A solid electrolyte for an all-solid secondary battery, the solid electrolyte including: Li, S, P, an M1 element, and an M2 element, wherein the M1 element is at least one element selected from Na, K, Rb, Sc, Fr, and the M2 element is at least one element selected from F, Cl, Br, I, molar amounts of lithium and the M1 element satisfy 0<M1/(Li+M1)?0.07, and the solid electrolyte has peaks at positions of 15.42°±0.50° 2?, 17.87° degrees±0.50° degrees 2?, 25.48° degrees±0.50° degrees 2?, 30.01° degrees±0.50° 2?, and 31.38°±0.50° 2? when analyzed by X-ray diffraction using CuK? radiation.

Abstract: A solid ion conductor compound including Li, Ho, and a halogen element, wherein the compound has diffraction peaks at 30°2? to 33°2?, 33°2? to 36°2?, 40°2? to 44°2?, and 48°2? to 52°28?, when analyzed using CuK? radiation, and wherein a full width at half maximum of at least one peak at 40°2? to 44°2? is 0.3°2? or greater.

Abstract: A composite cathode active material including: a core particle; a first coating layer; and a second coating layer; wherein the core particle includes a cathode active material, the first and second coating layers cover a surface of the core particle, the first coating layer includes a first lithium-containing compound, wherein the first lithium-containing compound includes zirconium, niobium, titanium, aluminum, or a combination thereof, the second coating layer includes a second lithium-containing compound, wherein the second lithium-containing compound includes germanium, niobium, gallium, or a combination thereof, and the first lithium-containing compound is different from the second lithium-containing compound.

Abstract: A method of preparing a sulfide solid electrolyte, the method including: first contacting a starting materials including Li2S, P2S5, and LiI in a first solvent to provide a precursor; and second contacting the precursor with a second solvent to prepare the sulfide solid electrolyte, wherein the first solvent includes a C1-C3 alkyl group or a cyclic ether compound which is unsubstituted or substituted with a C1-C3 alkoxy group, and the second solvent includes a C1-C10 hydrocarbon substituted with a C1 to C6 alkoxy group.

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 cathode active material includes a cathode active material particle; and a coating layer on a surface of the cathode active material particle, wherein the coating layer includes an acetate, wherein the acetate comprises an alkali metal acetate, an alkaline earth metal acetate, a transition metal acetate, or a combination thereof, or a derivative thereof.

Abstract: A positive electrode active material includes a core and a coating disposed on at least a portion of a surface of the core. The core includes a lithium metal oxide, a lithium metal phosphate, or a combination thereof. The coating includes a compound according to the formula LimM1nXp, wherein M1, X, m, n and p are as defined herein. Also, an electrochemical cell including the positive electrode active material, and methods for the manufacture of the positive electrode active material and the electrochemical cell.

Abstract: A method of preparing a solid electrolyte and an all-solid battery including a solid electrolyte prepared by the method, the method including: contacting a first solvent and a first starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a first solution; precipitating a first precursor from the first solution; contacting a second solvent, the first precursor, and a second starting material comprising an alkali metal, sulfur, phosphorus, an element M, or a combination thereof to form a second solution; precipitating a second precursor from the second solution; and heat treating the second precursor to prepare the solid electrolyte, wherein the element M comprises an element of Group 14 of the Periodic Table of the Elements, and the element M and the alkali metal in the first starting material and the second starting material are the same or different.

Abstract: A solid electrolyte for an all-solid secondary battery, wherein the solid electrolyte has a composition represented by Formula (1): Li7-xPS6-xBrx??(1) wherein 1.2<x<1.75, the solid electrolyte has an argyrodite crystal structure, and the solid electrolyte has at least one peak at a position of a 29.65±0.50° 2? when analyzed by X-ray diffraction using CuK? radiation.