US 9,809,456 B2
Manufacturing method for positive electrode active material
Akiharu Miyanaga, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., LTD., Kanagawa-ken (JP)
Filed by Akiharu Miyanaga, Kanagawa (JP)
Filed on Jul. 29, 2010, as Appl. No. 12/846,000.
Claims priority of application No. 2009-184015 (JP), filed on Aug. 7, 2009.
Prior Publication US 2011/0031105 A1, Feb. 10, 2011
Int. Cl. C01B 25/37 (2006.01); B01J 19/12 (2006.01); C01B 25/45 (2006.01); H01M 4/58 (2010.01)
CPC C01B 25/37 (2013.01) [B01J 19/126 (2013.01); C01B 25/372 (2013.01); C01B 25/375 (2013.01); C01B 25/45 (2013.01); B01J 2219/00141 (2013.01); H01M 4/5825 (2013.01); Y02E 60/122 (2013.01); Y02P 70/54 (2015.11)] 8 Claims
OG exemplary drawing
 
1. A method of manufacturing a positive electrode active material, comprising the steps of:
providing a solid in an airtight container which is configured to transmit a microwave, the solid consisting essentially of:
a transition metal compound;
a compound including lithium; and
a phosphate, wherein at least one of the transition metal compound, the compound including lithium and the phosphate is a hydrate,
directly irradiating the solid with a microwave to evaporate water in the hydrate, thereby increasing pressure in the airtight container and synthesizing a lithium transition metal phosphate by hydrothermal reaction;
after the irradiating, preparing a battery comprising a positive electrode comprising the solid, a negative electrode, and an electrolyte comprising a sodium salt;
applying a voltage to the battery; and
performing a sodium-lithium ion replacement of the solid in the battery.