Production method of electrode for all-solid-state batteries and production method of all-solid-state battery
In a production method of an electrode for all-solid-state batteries, the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles, the solid electrolyte particles include a first group of particles having an average particle diameter d 1 , and a second group of particles having an average particle diameter d 2 . The production method includes: a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A; a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and a pressing step of pressing the mixture B to form the electrode mixture layer. A ratio of the average particle diameter d 2 to the average particle diameter d 1 :d 2 /d 1 satisfies d 2 /d 1 ≥1.5.
1. A production method of an electrode for all-solid-state batteries,
the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles,
the solid electrolyte particles including a first group of particles having an average particle diameter d 1 , and a second group of particles having an average particle diameter d 2 ,
the method comprising:
a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A;
a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and
a pressing step of pressing the mixture B to form the electrode mixture layer, wherein
a ratio of the average particle diameter d 2 to the average particle diameter d 1 : d 2 /d 1 satisfies d 2 /d 1 ≥1.5,
the average particle diameter d 2 is 6 μm or more, and
the mixture A and the mixture B are obtained in the absence of a binder.
2. The method of claim 1 , wherein the pressing step includes at least a step of pressing the mixture B at a pressure of 400 MPa or more and 1500 MPa or less.
3. The method of claim 1 , wherein the average particle diameter d 1 is 10 μm or less.
4. The method of claim 1 , wherein an average particle diameter D 1 of the active material particles and the average particle diameter d 2 satisfy D 1 >d 2 .
5. The method of claim 1 , wherein the average particle diameter D 1 of the active material particles is 20 μm or less.
6. The method of claim 1 , wherein the solid electrolyte particles comprise a sulfide containing Li and P.
7. The method of claim 1 , wherein a ratio of an amount of the solid electrolyte particles to a total amount of the active material particles and the solid electrolyte particles is 5 mass % or more and 40 mass % or less, and a ratio of an amount of the first group of particles to a total amount of the first group of particles and the second group of particles is 10 mass % or more and 80 mass % or less.
8. A production method of an electrode for all-solid-state batteries,
the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles,
the solid electrolyte particles including a first group of particles having an average particle diameter d 1 , and a second group of particles having an average particle diameter d 2 ,
the method comprising:
a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A;
a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and
a pressing step of pressing the mixture B to form the electrode mixture layer, wherein
a ratio of the average particle diameter d 2 to the average particle diameter d 1 : d 2 /d 1 satisfies d 2 /d 1 ≥1.5, and
mixing of the active material particles and the first group of particles is performed under heating.
9. A production method of an electrode for all-solid-state batteries,
the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles,
the solid electrolyte particles including a first group of particles having an average particle diameter d 1 , and a second group of particles having an average particle diameter d 2 ,
the method comprising:
a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A;
a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and
a pressing step of pressing the mixture B to form the electrode mixture layer, wherein
a ratio of the average particle diameter d 2 to the average particle diameter d 1 : d 2 /d 1 satisfies d 2 /d 1 ≥1.5, and
mixing of the mixture A and the second group of particles is performed under heating.
10. A production method of an all-solid-state battery,
the method comprising
a step of forming an electrode group, the electrode group including a first electrode, a second electrode having a polarity opposite to a polarity of the first electrode, and a solid electrolyte layer interposed between the first electrode and the second electrode, wherein:
the step of forming the electrode group includes a first-electrode forming step of forming the first electrode, a step of forming the solid electrolyte layer by using an ion-conductive solid electrolyte by a dry process, and a second-electrode forming step of forming the second electrode, and
at least one of the first-electrode forming step and the second-electrode forming step includes the method of claim 1 .
11. A production method of an electrode for all-solid-state batteries,
the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles,
the solid electrolyte particles including a first group of particles having an average particle diameter d 1 , and a second group of particles having an average particle diameter d 2 ,
the method comprising:
a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A;
a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and
a pressing step of pressing the mixture B to form the electrode mixture layer, wherein
a ratio of the average particle diameter d 2 to the average particle diameter d 1 : d 2 /d 1 satisfies d 2 /d 1 ≥1.5, and
the pressing step includes at least a step of pressing the mixture B at a pressure of 1000 MPa or more and 1500 MPa or less.
12. A production method of an all-solid-state battery,
the method comprising
a step of forming an electrode group, the electrode group including a first electrode, a second electrode having a polarity opposite to a polarity of the first electrode, and a solid electrolyte layer interposed between the first electrode and the second electrode, wherein:
the step of forming the electrode group includes a first-electrode forming step of forming the first electrode, a step of forming the solid electrolyte layer by using an ion-conductive solid electrolyte by a dry process, and a second-electrode forming step of forming the second electrode, and
at least one of the first-electrode forming step and the second-electrode forming step includes the method of claim 8 .
13. A production method of an all-solid-state battery,
the method comprising
a step of forming an electrode group, the electrode group including a first electrode, a second electrode having a polarity opposite to a polarity of the first electrode, and a solid electrolyte layer interposed between the first electrode and the second electrode, wherein:
the step of forming the electrode group includes a first-electrode forming step of forming the first electrode, a step of forming the solid electrolyte layer by using an ion-conductive solid electrolyte by a dry process, and a second-electrode forming step of forming the second electrode, and
at least one of the first-electrode forming step and the second-electrode forming step includes the method of claim 9 .
14. A production method of an all-solid-state battery,
the method comprising
a step of forming an electrode group, the electrode group including a first electrode, a second electrode having a polarity opposite to a polarity of the first electrode, and a solid electrolyte layer interposed between the first electrode and the second electrode, wherein:
the step of forming the electrode group includes a first-electrode forming step of forming the first electrode, a step of forming the solid electrolyte layer by using an ion-conductive solid electrolyte by a dry process, and a second-electrode forming step of forming the second electrode, and
at least one of the first-electrode forming step and the second-electrode forming step includes the method of claim 11 .