Abstract: A lithium secondary battery includes a lithium metal and/or a lithium alloy as a negative electrode active material, in which the lithium secondary battery can be enhanced in capacity retention rate and can be suppressed in generation of dendrite lithium. A lithium secondary battery comprises a negative electrode current collector layer, a metal layer, and a negative electrode active material layer, the negative electrode active material layer contains a lithium metal or a lithium alloy, the coverage of the negative electrode current collector layer with the metal layer is 50% or more and less than 95%, and the metal layer has a first metal that is taken with lithium to form an alloy, and a second metal contained in the negative electrode current collector layer.

Abstract: A lithium secondary battery with a lithium metal and/or a lithium alloy as a negative electrode active material, in which the lithium secondary battery can be inhibited from being increased in resistance value in heat generation thereof is provided. A lithium secondary battery, wherein the lithium secondary battery comprises a negative electrode current collector layer, a metal layer, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer in the listed order, the negative electrode active material layer contains a lithium metal or a lithium alloy, the thickness of the metal layer is 10 nm to 4000 nm, and the metal layer has a first metal that is taken with lithium to form an alloy, and a second metal contained in the negative electrode current collector layer.

Abstract: A lithium metal secondary battery with enhanced in capacity retention rate and reduced in resistance value is provided. A lithium metal secondary battery, wherein the lithium metal secondary battery comprises a negative electrode current collector layer, a metal layer, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer in the listed order, the negative electrode active material layer contains a lithium metal and a metal particle dispersed in the lithium metal, the metal particle contains a metal element that is taken with lithium to form an alloy, and the area ratio of the metal particle is 1×10?5% to 50% in observation of a cross section of the negative electrode active material layer in a full charge state.

Abstract: An object of the present disclosure is then to provide a lithium secondary battery with a lithium alloy as a negative electrode active material, in which the lithium secondary battery is enhanced in capacity retention rate and reduced in resistance value. A lithium secondary battery, wherein the lithium secondary battery comprises a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer in the listed order, the negative electrode active material layer contains lithium, a first metal element that is taken with lithium to form an alloy, and a second metal element that is taken with lithium to form an alloy, the concentration (atomic %) of the first metal element in a surface facing the electrolyte layer is higher than the concentration (atomic %) of the first metal element in a surface facing the negative electrode current collector layer.

Abstract: An anode for a lithium secondary battery, including: a cladding material obtained by bonding an anode active material layer and a current collector layer to each other, in which the anode active material layer contains aluminum, the current collector layer is made of a metal foil, and the anode active material layer satisfies (1) and (2) in which (1): an average voltage of a lithium alloying reaction in the anode active material layer measured using lithium metal as a counter electrode of the anode active material layer is 0.05 V or more, and (2): the average voltage of the lithium alloying reaction in the anode active material layer measured using lithium metal as the counter electrode of the anode active material layer is higher than an average voltage of a lithium alloying reaction in the current collector layer, and a difference in the average voltage of the lithium alloying reaction between the anode active material layer and the current collector layer is 0.05 V or more and 0.5 V or less.

Abstract: A metal anode is provided, including: an active layer formed of lithium and a base material in which the lithium is solid-dissolved; and a base material layer formed of the base material, in which the metal anode has a plate shape including a first surface and a second surface facing each other, the active layer is present on a side of the first surface, the base material layer is present on a side of the second surface, the active layer and the base material layer are laminated in contact with each other, the base material includes one or more metals selected from the group consisting of Al, Si, Sn, and Pb, and the base material layer has a standard deviation of length, which is from the second surface to the active layer, of 0 or greater and 10 or less.

Abstract: An anode for a current collector-integrated secondary battery includes: an anode surface, and a current collector surface, in which the anode for a current collector-integrated secondary battery is a plate-shaped metal anode, and an average crystal grain size when a cross section of the metal anode is observed in a scanning ion microscope (SIM) image is 200 ?m or less.

Abstract: A lithium secondary battery includes: a metal anode capable of being doped and dedoped with lithium ions; a cathode capable of being doped and dedoped with the lithium ions; and an electrolyte disposed between the metal anode and the cathode, in which the metal anode has a plate shape, and is composed of lithium and a base material in which the lithium is solid-dissolved, the metal anode in a discharged state has a layer of a substitutional solid solution, the substitutional solid solution has a structure in which a part of a crystal lattice of a metal constituting the base material is substituted with the lithium, and the layer is located on a surface of the metal anode opposite to a surface facing the cathode or inside the metal anode.

Abstract: The present invention is a method to manufacture the SnZnNiCu solder powder through liquid quenching atomizing method, and an atomizing temperature is not less than 500° C., in particular, not less than 900° C. The raw material metal used as raw material of the solder powder comprises 3 to 12% by weight of Zn, 1.0 to 15% by weight of the sum of Cu and Ni, and Sn and inevitable impurities for the rest, to the total amount of raw material. Thereby, high joint strength is achieved and the SnZnNiCu solder powder which can improve joint reliability of solder joint part is provided.

Abstract: The present invention is a method to manufacture the SnZnNiCu solder powder through liquid quenching atomizing method, and an atomizing temperature is not less than 500° C., in particular, not less than 900° C. The raw material metal used as raw material of the solder powder comprises 3 to 12% by weight of Zn, 1.0 to 15% by weight of the sum of Cu and Ni, and Sn and inevitable impurities for the rest, to the total amount of raw material. Thereby, high joint strength is achieved and the SnZnNiCu solder powder which can improve joint reliability of solder joint part is provided.