Solid electrolyte, manufacturing method of solid electrolyte, battery and battery pack
According to one embodiment, a solid electrolyte includes a sintered body of ceramic grains. The sintered body includes a crystal plane having an ion conducting path. The crystal plane is oriented in a direction which intersects at least one surface of the solid electrolyte.
1. A method for manufacturing a solid electrolyte comprising:
applying an alternating electric field in a direction which intersects at least one surface of a solid electrolyte precursor comprising a ceramic-grain sintered body comprising a crystal plane having an ion conducting path, while heating the solid electrolyte precursor, thereby orienting the crystal plane.
2. The method according to claim 1 , wherein the applying the alternating electric field further comprises:
arranging the solid electrolyte precursor between platinum electrodes; and
sintering the solid electrolyte precursor while applying the alternating electric field between the platinum electrodes.
3. The method according to claim 1 , wherein a voltage of the alternating electric field falls within a range of 0.1 V to 5.0 V.
4. The method according to claim 3 , wherein a frequency of the alternating electric field falls within a range of 10 mHz to 10 MHz.
5. The method according to claim 1 , wherein the solid electrolyte is a perovskite-type solid electrolyte or a garnet-type solid electrolyte.
6. The method according to claim 1 , wherein the crystal plane is oriented in a direction which intersects at least one surface of the solid electrolyte.
7. The method according to claim 6 , wherein the direction intersects the at least one surface of the solid electrolyte in a range of not more than 30° with respect to a perpendicular of the at least one surface of the solid electrolyte.
8. The method according to claim 6 , wherein the crystal plane is oriented in a direction which perpendicularly intersects the at least one surface of the solid electrolyte.
9. The method according to claim 1 , wherein the ceramic-grain sintered body has lithium-ion conduction.
10. The method according to claim 1 , wherein the applying the alternating electric field further comprises:
arranging the solid electrolyte precursor between a positive electrode and a negative electrode to obtain a laminated body; and
sintering the solid electrolyte precursor while applying hot pressing and the alternating electric field to the laminated body.