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US 2019/0245206 A1Published application
Manufacturing method of composite oxide and manufacturing method of power storage device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTakuya MIWA, Kuniharu NOMOTO, Junpei MOMO
Life of this patent
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Abstract
An object is to reduce variation in shape of crystals that are to be formed. Solutions containing respective raw materials are made in an environment where an oxygen concentration is lower than that in air, the solutions containing the respective raw materials are mixed in an environment where an oxygen concentration is lower than that in air to form a mixture solution, and with use of the mixture solution, a composite oxide is formed by a hydrothermal method.
Claims12
(canceled)
A production method comprising the steps of:
- forming a first solution comprising Li in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising Li in a first water having an oxygen concentration lower than or equal to 4.5 ppm;
- forming a second solution comprising P in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising P in a second water having an oxygen concentration lower than or equal to 4.5 ppm;
- forming a third solution comprising one or more transition metal elements in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising the one or more transition metal elements in a third water having an oxygen concentration lower than or equal to 4.5 ppm;
- mixing the first solution and the second solution in an atmosphere having an oxygen concentration lower than the oxygen concentration in air to form a first mixed solution comprising Li and P;
- mixing the third solution and the first mixed solution in an atmosphere having an oxygen concentration lower than the oxygen concentration in air to form a second mixed solution;
- and
- forming a compound represented by Formula LiMPO4 from the second mixed solution by a hydrothermal method in an atmosphere having an oxygen concentration lower than the oxygen concentration in air,
- wherein the one or more transition metal elements is one or more elements selected from the group consisting of Fe, Co, Ni and Mn, and
- wherein M in LiMPO4 denotes the one or more transition metal elements.
6 more elements
A production method comprising the steps of:
- forming a first solution comprising Li in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising Li in a first water performed a nitrogen bubbling;
- forming a second solution comprising P in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising P in a second water performed a nitrogen bubbling;
- forming a third solution comprising one or more transition metal elements in an atmosphere having an oxygen concentration lower than the oxygen concentration in air by dissolving a compound comprising the one or more transition metal elements in a third water performed a nitrogen bubbling;
- mixing the first solution and the second solution in an atmosphere having an oxygen concentration lower than the oxygen concentration in air to form a first mixed solution comprising Li and P;
- mixing the third solution and the first mixed solution in an atmosphere having an oxygen concentration lower than the oxygen concentration in air to form a second mixed solution;
- and
- forming a compound represented by Formula LiMPO4 from the second mixed solution by a hydrothermal method in an atmosphere having an oxygen concentration lower than the oxygen concentration in air,
- wherein the one or more transition metal elements is one or more elements selected from the group consisting of Fe, Co, Ni and Mn, and
- wherein M in LiMPO4 denotes the one or more transition metal elements.
6 more elements
Dependencies are inferred from the claim text.