A process for preparing doped-lithium lanthanum zirconium oxide (doped-LLZO) is described herein. The method involves dry doping of a co-precipitated lanthanum zirconium oxide (LZO) precursor. Dry doping is a process in which a dry powdered dopant is ground and mixed with a pre-prepared co-precipitated LZO precursor and a lithium salt to provide a LLZO precursor composition, which is subsequently calcined to form a doped-LLZO. The process described herein comprises calcining a dry, powdered (e.g., micron, sub-micron or nano-powdered) mixture of a co-precipitated LZO precursor, a dopant salt or oxide, and a lithium salt under an oxygen-containing atmosphere at a temperature in the range of about 500 to about 1100° C., and recovering the doped-LLZO after calcining.

A stacked solid-state battery according to the present disclosure has a configuration in which a plurality of cells, each including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer, are stacked such that the positive electrode layers or the negative electrode layers of adjacent cells are disposed to face each other and, contains a first solid electrolyte represented by the following composition formula (1).

(Li.sub.7-3xGa.sub.x)(La.sub.3-yNd.sub.y)Zr.sub.2O.sub.12  (1)

(In the formula (1), 0.1≤x≤1.0 and 0.01≤y≤0.20.)

A stacked solid-state battery according to the present disclosure has a structure in which a plurality of cells, each including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer provided between the positive electrode layer and the negative electrode layer, are stacked such that the positive electrode layers or the negative electrode layers of adjacent cells are disposed to face each other and, contains a first solid electrolyte represented by the following composition formula (1).

Li.sub.7-3xM1.sub.xLa.sub.3-3yM2.sub.yZr.sub.2O.sub.12  (1)

(In the formula (1), 0.010≤x≤2.00, 0.010≤y≤1.00, M1 is at least one element selected from the group consisting of Al, Ga, and In, and M2 is at least one element selected from the group consisting of Ce and Nd).

A ceramic sheet including a principal surface having particle marks is disclosed. The average width of the particle marks is 0.2 to 50 μm, the average depth of the particle marks along the sheet thickness direction is 0.1 to 25 μm, and the coefficient of variation of the widths of the particle marks is 0.23 or more.

There is provided a hydrogen-substituted garnet-type oxide containing at least Li, H, La and Zr and has an amount of hydrogen a (moll unit) per one unit of a garnet-type oxide in a range of ≤1.85.

A fuel cell system component ink includes a fuel cell system component powder, a solvent including propylene carbonate (PC), and a binder including polypropylene carbonate (PPC).

A solid electrolyte including: a lithium ion inorganic conductive layer; and an amorphous phase on a surface of the lithium ion inorganic conductive layer, wherein the amorphous phase is an irradiation product of the lithium ion inorganic conductive layer. Also, the method of preparing the same, and a lithium battery including the solid electrolyte.

An oxide including a compound represented by Formula 1:
(Li.sub.xM1.sub.y)(M2).sub.3-δ(M3).sub.2-ωO.sub.12-zX.sub.z  Formula 1
wherein, in Formula 1, 6≤x≤8, 0≤y<2, −0.2≤δ≤0.2, −0.2≤ω≤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.

Provided is a solid oxide fuel cell having high power generation efficiency and being operable at low temperature. A fuel cell of the present invention includes a cathode electrode, an anode electrode, and a solid electrolyte layer disposed between the cathode electrode and the anode electrode and formed from polycrystalline zirconia or polycrystalline ceria doped with divalent or trivalent positive ions and having proton conductivity, in which the cathode electrode and the solid electrolyte layer are stacked with a first oxygen ion blocking layer interposed therebetween.

Molten lithium-sulfur and lithium-selenium electrochemical cells are disclosed. A solid electrolyte separates a molten lithium metal or molten lithium metal alloy from a molten sulfur or molten selenium. The molten lithium-sulfur and lithium-selenium cells have low over potential, no side reaction, and no dendrite growth. These cells have high Coulombic efficiency and energy efficiency and thus provide new chemistries to construct high-energy, high-power, long-lifetime, low-cost and safe energy storage systems.