LITHIUM COMPOUND, METHOD FOR PRODUCING THE LITHIUM COMPOUND, AND METHOD FOR PRODUCING POSITIVE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
First Claim
1. A lithium compound for production of a positive active material for a nonaqueous electrolyte secondary battery, with which a lithium transition metal composite oxide can be obtained by:
- mixing the lithium compound with a transition metal composite hydroxide obtained by crystallization reaction, or a transition metal composite oxide obtained by heat treatment of the transition metal composite hydroxide; and
thenfiring the thus mixed and obtained mixture, whereinwhen water, and a magnet having a magnetic flux density of 0.9 tesla are added to and mixed with the lithium compound, and then the mixture is stirred for 30 minutes,an amount of magnetically attractable substances to be captured by the magnet is 0.0007 mass % or less with respect to an amount of lithium contained in the lithium compound.
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Abstract
A lithium compound is provided, with which a positive active material containing a decreased amount of magnetically attractable substances can be easily obtained while shortening the total time for production of a positive electrode for a nonaqueous electrolyte secondary battery. The lithium compound is used for producing a positive active material for a nonaqueous electrolyte secondary battery, with which a lithium transition metal composite oxide can be obtained by mixing the lithium compound with a transition metal composite hydroxide or the like obtained by crystallization reaction, and then firing the mixture obtained by mixing, wherein when water and a magnet are added to and mixed and stirred with the lithium compound, the amount of magnetically attractable substances captured by the magnet is 0.0007 mass % or less with respect to the amount of lithium in the lithium compound. Therefore, a positive active material in which the amount of magnetically attractable substances contained is 0.02 mass ppm or less can be easily obtained while shortening the total time for production of the positive active material.
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Citations
10 Claims
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1. A lithium compound for production of a positive active material for a nonaqueous electrolyte secondary battery, with which a lithium transition metal composite oxide can be obtained by:
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mixing the lithium compound with a transition metal composite hydroxide obtained by crystallization reaction, or a transition metal composite oxide obtained by heat treatment of the transition metal composite hydroxide; and
thenfiring the thus mixed and obtained mixture, wherein when water, and a magnet having a magnetic flux density of 0.9 tesla are added to and mixed with the lithium compound, and then the mixture is stirred for 30 minutes, an amount of magnetically attractable substances to be captured by the magnet is 0.0007 mass % or less with respect to an amount of lithium contained in the lithium compound. - View Dependent Claims (2, 3, 4, 8, 9, 10)
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- 5. A method for producing a lithium compound for production of a positive active material for a nonaqueous electrolyte secondary battery, whereby an amount of magnetically attractable substances in the lithium compound is 0.0007 mass % or less with respect to an amount of lithium contained in the lithium compound through contact of a magnetized screen with the lithium compound and use of a magnetic separator for removing magnetically attractable substances.
Specification