Method for producing nonaqueous-electrolyte battery and nonaqueous-electrolyte battery

A method for producing a nonaqueous-electrolyte battery including a positive-electrode active-material layer, a negative-electrode active-material layer, and a sulfide-solid-electrolyte layer disposed between these active-material layers, the method comprising:

• a step of preparing a positive-electrode body including a positive-electrode active-material layer including a powder-molded body, and a positive-electrode-side solid-electrolyte layer that is amorphous, has a thickness of 2 μM or less, and is formed on the positive-electrode active-material layer by a vapor-phase process;
• a step of preparing a negative-electrode body including a negative-electrode active-material layer including a powder-molded body;
• and
• a step of bonding together the positive-electrode body and the negative-electrode body by subjecting the electrode bodies being arranged such that the positive-electrode-side solid-electrolyte layer and the negative-electrode active-material layer are in contact with each other, to a heat treatment under application of a pressure to crystallize the positive-electrode-side solid-electrolyte layer,
• wherein the positive-electrode active-material layer is
• obtained by press-molding a positive-electrode active-material powder formed of boron-doped LiNiαCoβAlγO2 (α=0.80 to 0.81, β=0.15, γ=0.04 to 0.05) and a sulfide-solid-electrolyte powder, or
• obtained by press-molding a positive-electrode active-material powder formed of LiNiαMnβCoγO2 (α=0.1 to 0.8, β=0.1 to 0.8, γ=0.1 to 0.8) and a sulfide-solid-electrolyte powder.

A method for producing a nonaqueous-electrolyte battery including a positive-electrode active-material layer, a negative-electrode active-material layer, and a sulfide-solid-electrolyte layer disposed between these active-material layers, the method comprising:

• a step of preparing a positive-electrode body including a positive-electrode active-material layer including a powder-molded body;
• a step of preparing a negative-electrode body including a negative-electrode active-material layer including a powder-molded body, and a negative-electrode-side solid-electrolyte layer that is amorphous, has a thickness of 2 μm or less, and is formed on the negative-electrode active-material layer by a vapor-phase process;
• and
• a step of bonding together the positive-electrode body and the negative-electrode body by subjecting the electrode bodies being arranged such that the positive-electrode active-material layer and the negative-electrode-side solid-electrolyte layer are in contact with each other, to a heat treatment under application of a pressure to crystallize the negative-electrode-side solid-electrolyte layer,
• wherein the positive-electrode active-material layer is
• obtained by press-molding a positive-electrode active-material powder formed of boron-doped LiNiαCoβAlγO2 (α=0.80 to 0.81, β=0.15, γ=0.04 to 0.05) and a sulfide-solid-electrolyte powder, or
• obtained by press-molding a positive-electrode active-material powder formed of LiNiαMnβCoγO2 (α=0.1 to 0.8, β=0.1 to 0.8, γ=0.1 to 0.8) and a sulfide-solid-electrolyte powder.

A nonaqueous-electrolyte battery comprising a positive-electrode active-material layer, a negative-electrode active-material layer, and a sulfide-solid-electrolyte layer disposed between these active-material layers,

• wherein the positive-electrode active-material layer and the negative-electrode active-material layer each include a powder-molded body,
• the solid-electrolyte layer is a crystalline integrated layer formed by bonding together a positive-electrode-side solid-electrolyte layer disposed on a side of the positive-electrode active-material layer and a negative-electrode-side solid-electrolyte layer disposed on a side of the negative-electrode active-material layer,
• the positive-electrode active-material layer contains a positive-electrode active-material powder formed of boron-doped LiNiαCoβAlγO2 (α=0.80 to 0.81, β=0.15, γ=0.04 to 0.05) and a sulfide-solid-electrolyte powder, or contains a positive-electrode active-material powder formed of LiNiαMnβCoγO2 (α=0.1 to 0.8, β=0.1 to 0.8, γ=0.1 to 0.8) and a sulfide-solid-electrolyte powder, and
• the solid-electrolyte layer has a resistance of 50 Ω·cm2 or less.

A nonaqueous-electrolyte battery comprising a positive-electrode active-material layer, a negative-electrode active-material layer, and a sulfide-solid-electrolyte layer disposed between these active-material layers,

• wherein the positive-electrode active-material layer and the negative-electrode active-material layer each include a powder-molded body,
• the positive-electrode active-material layer contains a positive-electrode active-material powder formed of boron-doped LiNiαCoβAlγO2 (α=0.80 to 0.81, β=0.15, γ=0.04 to 0.05) and a sulfide-solid-electrolyte powder, or contains a positive-electrode active-material powder formed of LiNiαMnβCoγO2 (α=0.1 to 0.8, β=0.1 to 0.8, γ=0.1 to 0.8) and a sulfide-solid-electrolyte powder,
• the solid-electrolyte layer is a crystalline layer having a thickness of 2 μm or less, and
• the solid-electrolyte layer has a resistance of 50 Ω·cm2 or less.