A solid electrolyte composition includes: an inorganic solid electrolyte; binder particles having an average particle size of 1 nm to 10 μm; and a dispersion medium, in which the binder particles include a polymer that includes a component derived from a polymerizable compound having a molecular weight of lower than 1,000, and the component includes at least one of an aliphatic hydrocarbon chain to which 10 or more carbon atoms are bonded or a siloxane structure as a side chain of the polymer. The solid electrolyte composition is used in the sheet for an all-solid state secondary battery, the electrode sheet for an all-solid state secondary battery, the all-solid state secondary battery, the method of manufacturing a sheet for an all-solid state secondary battery, and the method of manufacturing an all-solid state secondary battery.

An anode material having 0.8≤0.06×(Dv50).sup.2−2.5×Dv50+Dv99≤12 (1); and 1.2≤0.2×Dv50−0.006×(Dv50).sup.2+BET≤5 (2), where Dv50 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 50% of the particles, Dv99 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 99% of the particles, and BET is a specific surface area of the anode material, wherein Dv50 and Dv99 are expressed in μm and BET is expressed in m.sup.2/g. The anode material is capable of significantly improving the rate performance of electrochemical devices.

Disclosed is a method for producing a sulfide-based solid electrolyte containing an alkali metal, a sulfur element, a phosphorus element and a halogen element, including performing a reaction of an alkali metal sulfide and a substance containing at least one element of a sulfur element, a phosphorus element and a halogen element in an organic solvent having an electron-withdrawing group. The method provides a sulfide-based solid electrolyte having a high ion conductivity.

A metal-air cell comprises a negative electrode, a negative electrode case housing the negative electrode, sealed while a lead of the negative electrode extends from the negative electrode case, including a separator that forms at least part of the negative electrode case, an air electrode facing the negative electrode across the separator, and a cell case housing the negative electrode case and the air electrode and sealed while the lead of the negative electrode expands from the cell case and a lead of the air electrode expands from the cell case.

Disclosed is a rechargeable lithium battery including a positive electrode including a positive active material layer; and a negative electrode including a negative active material layer and a negative functional layer on the negative active material layer, wherein the functional layer includes flake-shaped polyethylene particles, and the positive active material layer includes a first positive active material including one or more composite oxides of lithium and a metal selected from cobalt, manganese, nickel, and a combination thereof, and a second positive active material including a compound represented by Chemical Formula 1 and. In Chemical Formula 1, 0.90≤a≤1.8, 0≤x≤0.7, and M is Mg, Co, Ni, or a combination thereof.
Li.sub.aFe.sub.1−xM.sub.xPO.sub.4  [Chemical Formula 1]

A lithium secondary battery including a negative electrode, a positive electrode, a first electrolyte layer facing the negative electrode; and a second electrolyte layer present on the first electrolyte layer, wherein the first electrolyte layer has a higher ion conductivity than the second electrolyte layer, and a lithium secondary battery comprising the electrolyte described above.

Disclosed is a transparent anode thin film comprising a transparent anode active material layer, wherein the transparent anode active material layer comprises a Si-based anode active material having a composition represented by the following [Chemical Formula 1]:
SiN.sub.x  [Chemical Formula 1] (wherein 0<x≤1.5).

Provided is a method for producing a composite alloy for use in an electrode for an alkaline storage battery, including a powder preparation step of preparing a hydrogen storage alloy powder containing Ti and Cr and having a BCC structure, an etching step of applying an acid to the hydrogen storage alloy powder prepared in the powder preparation step, a Pd film forming step of coating the surface of the hydrogen storage alloy powder subjected to the etching step with Pd using a substitution plating method, and a heat treatment step of heating the hydrogen storage alloy powder having a Pd film formed, at said heating being a temperature of 500° C. or less, wherein in the Pd coating forming step, the hydrogen storage alloy powder is coated with Pd under the condition that the Pd element weight ratio of the composite alloy to be produced is 0.47% or more.

A positive electrode active material for a lithium secondary battery and a method for manufacturing the same are disclosed herein. In some embodiments, a positive electrode active material comprises a positive electrode active material powder and a coating layer on a surface of the positive electrode active material powder, where the coating layer comprising a lithium molybdenum compound. The positive electrode active material may improve output and stability in a lithium secondary battery.

An electrochemical apparatus including an electrode assembly including a first electrode plate, a second electrode plate and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a current collector and an active material layer, the current collector includes a first zone and a second zone, the second zone is provided with an active material layer, the first zone includes a third zone and a fourth zone, the third zone is arranged in overlap with the separator, and the fourth zone is provided with a conductive layer. The conductive layer is disposed in a zone of the current collector that has no active material layer disposed thereon and that does not overlap the separator.