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US 12,609,314 B2Granted
Manufacturing method of composite oxide which is represented by formula LiMPO4, where m means iron and manganese
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTakuya Miwa, Kuniharu Nomoto, Junpei Momo
Life of this patent
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Abstract
A hydrothermal synthesis for LiFePO4 is provided. First, each raw material solution is prepared using a degassed water in advance, second, those solution are mixed by dripping in a fixed order, and then those materials are reacted in a hydrothermal synthesis, so that LiFePO4 is obtained in a predesigned form.
Claims2
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 LiMPO4 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.
6 more elements
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 LiMPO4 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.
6 more elements
Dependencies are inferred from the claim text.