Abstract: An air mobility device improves propulsion due to the Coand? effect when flying so as to increase a flying range and reduces noise when flying.

Abstract: A positive electrode active material, an all-solid-state battery comprising same, and a method for manufacturing same are proposed. The positive electrode active material may include a lithium metal oxide in the form of single particles having a particle strength of 300 MPa to 1500 MPa and an average particle diameter of at most 10 ?m. Since the positive electrode active material is in the form of single particles having a high particle strength of at least 300 MPa and a small average particle diameter of at most 10 ?m as indicated above, cracks may not form or may be delayed even when pressure is applied during the manufacture of the positive electrode or structural stress is applied over the lifespan of the battery.

Abstract: A solid electrolyte having satisfactory moisture stability and ion conductivity through activation energy improvement and a solid-state battery including the same are proposed. The solid electrolyte may include an oxysulfide-based compound represented by the following chemical formula: [Chemical formula] LiaMbPcSdOeXf, wherein 5?a?7, 0<b?1, 0?c<1, 2.5?d?5, 0<e?2, 1<f?1.5, M is at least one selected from the group consisting of Si, Ti, Ta, Nb, As, Sb, Sn and Al, and X is at least one selected from the group consisting of Cl, Br, I and F.