Method of manufacturing all-solid-state battery

Patent metadata

Field	Value
Publication number	US-10297874-B2
Application number	US-201615264726-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Sep 14, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A method of manufacturing an all-solid-state battery includes a lamination step of laminating a deactivated lithium-containing negative electrode active material layer containing deactivated lithium, a solid electrolyte layer for the all-solid-state battery, and a positive electrode active material layer for the all-solid-state battery such that the solid electrolyte layer for the all-solid-state battery is disposed between the deactivated lithium-containing negative electrode active material layer and the positive electrode active material layer for the all-solid-state battery.

First claim

What is claimed is:

1. A method of manufacturing an all-solid-state battery, the method comprising:
a construction step of constructing a temporary all-solid-state battery by laminating a deactivated lithium non-containing negative electrode active material layer, a solid electrolyte layer for supplying lithium, and a positive electrode active material layer for supplying lithium in this order;
a charging step of charging the temporary all-solid-state battery to supply lithium to the deactivated lithium non-containing negative electrode active material layer after the construction step such that the deactivated lithium non-containing negative electrode active material layer is converted into the deactivated lithium-containing negative electrode active material layer;
a removal step of removing the positive electrode active material layer for supplying lithium or the positive electrode active material layer for supplying lithium and the solid electrolyte for supplying lithium from the temporary all-solid-state battery after the charging step to obtain a first laminate including the solid electrolyte layer for supplying lithium and the deactivated lithium-containing negative electrode active material layer or the deactivated lithium-containing negative electrode active material, respectively; and
a lamination step of laminating the deactivated lithium-containing negative electrode active material layer containing deactivated lithium, a solid electrolyte layer for the all-solid-state battery, and a positive electrode active material layer for the all-solid-state battery such that the solid electrolyte layer for the all-solid-state battery is disposed between the deactivated lithium-containing negative electrode active material layer and the positive electrode active material layer for the all-solid-state battery;
wherein a lithium content which can be released from the positive electrode active material layer for supplying lithium is greater than a lithium content which can be released from the positive electrode active material layer for the all-solid-state battery.

2. The method according to claim 1 , wherein
in the lamination step, a first laminate and a second laminate are laminated such that a first solid electrolyte layer and a second solid electrolyte layer are joined to each other to form the solid electrolyte layer for the all-solid-state battery, the first laminate having a structure in which the deactivated lithium-containing negative electrode active material layer and the first solid electrolyte layer are laminated, and the second laminate having a structure in which the positive electrode active material layer for the all-solid-state battery and the second solid electrolyte layer are laminated.

3. The method according to claim 2 , wherein
in the lamination step, the first laminate, a solid electrolyte layer for joining, and the second laminate are laminated such that the first solid electrolyte layer, the solid electrolyte layer for joining, and the second solid electrolyte layer are joined to each other to form the solid electrolyte layer for the all-solid-state battery, and then the solid electrolyte layer for the all-solid-state battery is pressed.

4. The method according to claim 1 , wherein
after the removal step, the removed positive electrode active material layer for supplying lithium or the removed third laminate including the positive electrode active material layer for supplying lithium and the solid electrolyte layer for supplying lithium is reused in the construction step of constructing another temporary all-solid-state battery.

5. The method according to claim 1 , further comprising:
a discharging step of discharging the temporary all-solid-state battery after the charging step.

6. The method according to claim 5 , wherein
the charging step and the discharging step are alternately repeated multiple times.

7. The method according to claim 1 , wherein
the removal step is performed on the temporary all-solid-state battery in a state in which the deactivated lithium-containing negative electrode active material layer further contains non-deactivated lithium.

8. The method according to claim 7 , wherein
the deactivated lithium non-containing negative electrode active material layer contains silicon particles as a negative electrode active material, and
the removal step is performed in a state where a charge amount of the silicon particles in the deactivated lithium-containing negative electrode active material layer is 264 mAh/g or higher and where a lithium storage capacity of the deactivated lithium-containing negative electrode active material layer is higher than a lithium release capacity of the positive electrode active material layer for the all-solid-state battery.

9. The method according to claim 1 , wherein
in the charging step, a greater amount of lithium than an amount of lithium, which can be supplied from the positive electrode active material layer for the all-solid-state battery, is supplied from the positive electrode active material layer for supplying lithium to the deactivated lithium non-containing negative electrode active material layer.

10. The method according to claim 1 , further comprising:
a press step of pressing the deactivated lithium-containing negative electrode active material layer or the first laminate after the removal step.

11. The method according to claim 1 , wherein
a solid electrolyte of the solid electrolyte layer for the all-solid-state battery is a sulfide solid electrolyte.

12. The method according to claim 1 , wherein
the deactivated lithium-containing negative electrode active material layer contains a carbon negative electrode active material or a metal negative electrode active material.

13. The method according to claim 1 , wherein
the deactivated lithium-containing negative electrode active material layer contains silicon particles as a negative electrode active material.

14. The method according to claim 1 , wherein a ratio of a lithium content which can be released from the positive electrode active material layer for supplying lithium to a lithium content which can be released from the positive electrode active material for the all-solid-state battery is greater than 1.25.

15. The method according to claim 1 , wherein the positive electrode active material layer comprises a positive electrode active material coated with a lithium-containing metal oxide containing lithium as a component.

16. The method according to claim 2 , wherein the solid electrolyte layer for joining comprises an amorphous solid electrolyte.

17. The method according to claim 9 , wherein a total amount of lithium ions which can be released from the positive electrode active material layer for supplying lithium is at least 1.1 times an amount of lithium ions which can be released from the positive electrode active material layer for the all-solid-state battery.

18. The method according to claim 5 , wherein the charging step or the discharging step is finished at a voltage greater than a minimum value of the charge-discharge control voltage during normal use of the all-solid-state battery.

19. The method according to claim 18 , wherein the voltage at which the charging step or the discharging step is finished is at least 0.5V greater than the minimum value of the charge-discharge control voltage during normal use of the all-solid-state battery.

Assignees

• Toyota Motor Co Ltd

Inventors

• Omori Keisuke
• Hasegawa Hajime
• Haga Kengo
• Otaki Mitsutoshi
• Ose Norihiro
• Kosaka Daichi
• Hozumi masato

Classifications

• H01M10/0562

  Solid materials · CPC title

• H01M10/446 Primary

  Initial charging measures · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• H01M10/0525

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

• H01M4/386

  Silicon or alloys based on silicon · CPC title