Abstract:
A covered positive electrode active material includes a particulate positive electrode active material and a solid electrolyte that covers a surface of the positive electrode active material. The solid electrolyte forms a covering layer. The covering layer is formed such that recessed portions of the surface of the positive electrode active material are filled with the solid electrolyte. Protruding portions of the surface of the positive electrode active material are exposed on a surface of the covered positive electrode active material. A degree of unevenness of a group of particles of the positive electrode active material is defined as ζ1, a degree of unevenness of a group of particles of the covered positive electrode active material is defined as ζ2, and a degree of change in unevenness R defined by formula (2) below is greater than or equal to 1.1. R=ζ2/ζ1 (2)
Abstract:
An electricity storage device includes a first electrode, a second electrode, an electricity storage layer, and a p-type semiconductor layer. The electricity storage layer is placed between the first electrode and the second electrode. The electricity storage layer contains a mixture of an insulating material and n-type semiconductor particles. The p-type semiconductor layer is placed between the electricity storage layer and the second electrode. The n-type semiconductor particles contain at least one of a titanium-niobium composite oxide and a titanium-tantalum composite oxide.
Abstract:
A composite positive electrode active material includes a positive electrode active material and a coating layer coating at least a portion of a surface of the positive electrode active material. The coating layer contains a first coating material and a second coating material. The first coating material is a fluoride solid electrolyte, and the second coating material is a material that reacts with at least one selected from the group consisting of water and hydrogen fluoride, to form at least one selected from the group consisting of lithium oxide and lithium fluoride.
Abstract:
A solid electrolyte contains a composite metal halide. The composite metal halide contains magnesium, gallium, indium, and a halogen. In the composite metal halide, the molar ratio of indium to the total of gallium and indium is less than 0.2.
Abstract:
A solid electrolyte has a composition represented by the formula: MgxMySiOz, where M represents at least one selected from the group consisting of Ti, Zr, Hf, Ca, Sr, and Ba; x satisfies 0
Abstract:
An electrical storage device includes: a conductive anode collector; a conductive cathode collector; an anode between the anode collector and the cathode collector, the anode containing a mixture of an insulating material and an oxide of cerium; and a cathode between the cathode collector and the anode.
Abstract:
A coated positive electrode active material includes a positive electrode active material, a first coating layer, and a second coating layer. The first coating layer coats at least a portion of a surface of the positive electrode active material. The second coating layer coats at least a portion of a surface of a fundamental active material, which includes the first coating layer and the positive electrode active material. The first coating layer contains an oxide solid electrolyte. The second coating layer contains Li, Ti, M, and F, where M is at least one element selected from the group consisting of Ca, Mg, Al, Y, and Zr.
Abstract:
A secondary battery includes: a first electrode; a second electrode; a first solid electrolyte covering the first electrode, the first solid electrolyte containing an alkaline earth metal; and a liquid electrolyte filling the space between the first electrode and the second electrode, the liquid electrolyte containing a non-aqueous solvent and a salt of the alkaline earth metal dissolved in the non-aqueous solvent.
Abstract:
A charge storage device includes: a first electrode; a second electrode; a charge storage layer disposed between the first electrode and the second electrode; and an oxide layer disposed between the second electrode and the charge storage layer. The charge storage layer contains a mixture of semiconductor particles and insulator particles. An average particle size of the insulator particles is greater than or equal to the average particle size of the semiconductor particles.