Granted Patent B2

US 12,609,314 · App. 18/373,510 · Granted Apr 21, 2026

Inventors: Takuya Miwa (Kanagawa, JP); Kuniharu Nomoto (Saitama, JP); Junpei Momo (Kanagawa, JP)

Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

H01M4/5825C01D15/02C01G45/22C01G49/009C01G51/82C01G53/82C30B7/10H01M4/364H01M4/587C30B29/14H01M2004/028H01M2220/30

Abstract

Claims (18)

1 . A method for manufacturing a complex oxide comprising the steps of:

preparing a solution comprising lithium by dissolving a compound comprising lithium in first water with an oxygen concentration lower than or equal to 4.5 ppm under an atmosphere with an oxygen concentration lower than air;

preparing a solution comprising phosphorous by dissolving a compound comprising phosphorous in second water with an oxygen concentration lower than or equal to 4.5 ppm under the atmosphere;

preparing a solution comprising lithium and phosphorous by mixing the solution comprising lithium and the solution comprising phosphorous under the atmosphere;

preparing a solution comprising iron and manganese by dissolving a compound comprising iron and a compound comprising manganese in third water with an oxygen concentration lower than or equal to 4.5 ppm under the atmosphere;

preparing a mixed solution by mixing the solution comprising lithium and phosphorous and the solution comprising iron and manganese under the atmosphere; and

obtaining a complex oxide by performing a hydrothermal method on the mixed solution,

wherein the complex oxide is represented by Formula LiMPO 4 where M means iron and manganese, and

whereas the mixed solution is prepared by dripping the solution comprising lithium and phosphorous into the solution comprising iron and manganese while mixing the solution comprising iron and manganese.

2 . A method for manufacturing a complex oxide comprising the steps of:

preparing a solution comprising lithium by dissolving a compound comprising lithium in first water degassed by bubbling nitrogen under an atmosphere with an oxygen concentration lower than air;

preparing a solution comprising phosphorous by dissolving a compound comprising phosphorous in second water degassed by bubbling nitrogen under the atmosphere;

preparing a solution comprising lithium and phosphorous by mixing the solution comprising lithium and the solution comprising phosphorous under the atmosphere;

preparing a solution comprising iron and manganese by dissolving a compound comprising iron and a compound comprising manganese in third water degassed by bubbling nitrogen under the atmosphere;

preparing a mixed solution by mixing the solution comprising lithium and phosphorous and the solution comprising iron and manganese under the atmosphere; and

obtaining a complex oxide by performing a hydrothermal method on the mixed solution,

wherein the complex oxide is represented by Formula LiMPO 4 where M means iron and manganese, and

wherein the mixed solution is prepared by dripping the solution comprising lithium and phosphorous into the solution comprising iron and manganese while mixing the solution comprising iron and manganese.

Priority Claims (1)

Continuity (5)

References Cited (210)