Slurry, method for producing solid electrolyte layer, and method for producing all-solid-state battery

Patent metadata

Field	Value
Publication number	US-2019074543-A1
Application number	US-201816121030-A
Country	US
Kind code	A1
Filing date	Sep 4, 2018
Priority date	Sep 5, 2017
Publication date	Mar 7, 2019
Grant date	—

Abstract

Provided are a slurry for a solid electrolyte, which can reduce the usage of a polymer binder, a method for producing a solid electrolyte layer, and a method for producing an all-solid-state battery. Disclosed is a slurry for a solid electrolyte, the slurry comprising a solvent, a lithium compound, and crystal particles of a garnet-type ion-conducting oxide represented by a general formula (Lix−3y−z,Ey,Hz)LαMβOγ (where E is at least one kind of element selected from the group consisting of Al, Ga, Fe and Si; L is at least one kind of element selected from an alkaline-earth metal and a lanthanoid element; M is at least one kind of element selected from a transition element that can be six-coordinated with oxygen and typical elements in groups 12 to 15 of the periodic table; 3≤x−3y−z≤7; 0≤y≤0.25; 0<z≤2.8; 2.5≤α≤3.5; 1.5≤β≤2.5; and 11≤γ≤13).

First claim

1 . A slurry for a solid electrolyte, the slurry comprising a solvent, a lithium compound, and crystal particles of a garnet-type ion-conducting oxide represented by a general formula (Li x−3y−z ,E y ,H z )L α M β O γ (where E is at least one kind of element selected from the group consisting of Al, Ga, Fe and Si; L is at least one kind of element selected from an alkaline-earth metal and a lanthanoid element; M is at least one kind of element selected from a transition element that can be six-coordinated with oxygen and typical elements in groups 12 to 15 of the periodic table; 3≤x−3y−z≤7; 0≤y≤0.25; 0<z≤2.8; 2.5≤α≤3.5; 1.5≤β≤2.5; and 11≤γ≤13).

2 . The slurry according to claim 1 , wherein the solvent contains at least one selected from the group consisting of water and alcohols having 1 to 8 carbon atoms.

3 . The slurry according to claim 1 , wherein the element L is La, and the element M is at least one kind of element selected from the group consisting of Zr, Nb and Ta.

4 . The slurry according to claim 1 , wherein the lithium compound is at least one kind of compound selected from the group consisting of LiNO 3 and LiOH.

5 . The slurry according to claim 1 , wherein the solvent is supersaturated with the lithium compound.

6 . A method for producing a solid electrolyte layer, the method comprising steps of:
preparing a slurry comprising a solvent, a lithium compound, and crystal particles of a garnet-type ion-conducting oxide represented by a general formula (Li x−3y−z ,E y ,H z )L α M β O γ (where E is at least one kind of element selected from the group consisting of Al, Ga, Fe and Si; L is at least one kind of element selected from an alkaline-earth metal and a lanthanoid element; M is at least one kind of element selected from a transition element that can be six-coordinated with oxygen and typical elements in groups 12 to 15 of the periodic table; 3≤x−3y−z≤7; 0≤y≤0.25; 0<z≤2.8; 2.5≤α≤3.5; 1.5≤β≤2.5; and 11≤γ≤13), producing a green sheet for the solid electrolyte layer by using the slurry, and sintering the green sheet for the solid electrolyte layer.

7 . A method for producing an all-solid-state battery comprising a cathode active material layer, an anode active material layer, and a solid electrolyte layer disposed between the cathode active material layer and the anode active material layer, the method comprising steps of:
preparing a slurry comprising a solvent, a lithium compound, and crystal particles of a garnet-type ion-conducting oxide represented by a general formula (Li x−3y−z ,E y ,H z )L α M β O γ (where E is at least one kind of element selected from the group consisting of Al, Ga, Fe and Si; L is at least one kind of element selected from an alkaline-earth metal and a lanthanoid element; M is at least one kind of element selected from a transition element that can be six-coordinated with oxygen and typical elements in groups 12 to 15 of the periodic table; 3≤x−3y−z≤7; 0≤y≤0.25; 0<z≤2.8; 2.5≤α≤3.5; 1.5≤β≤2.5; and 11≤γ≤13), producing a green sheet for the solid electrolyte layer by using the slurry, and sintering the green sheet for the solid electrolyte layer after the step of producing the green sheet for the solid electrolyte layer.

8 . The method for producing the all-solid-state battery according to claim 7 , the method further comprising, after the step of producing the green sheet for the solid electrolyte layer, a step of forming a laminate in which the green sheet for the solid electrolyte layer is disposed between a green sheet for the cathode active material layer and a green sheet for the anode active material layer,
wherein the sintering step is a step of sintering the laminate.

Assignees

• Toyota Motor Co Ltd

Inventors

• Houjyou Yasutoshi
• Ohta Shingo

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title