CPC H01M 4/505 (2013.01) [C01G 53/44 (2013.01); H01M 4/525 (2013.01); C01P 2002/52 (2013.01); C01P 2004/03 (2013.01); C01P 2004/54 (2013.01); C01P 2004/61 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 10 Claims |
1. A method of preparing a positive electrode active material precursor for a secondary battery, the method comprising: preparing a positive electrode active material precursor by a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, a basic solution, and an ammonium solution to a batch-type reactor,
wherein a molar ratio of ammonium ions contained in the ammonium solution to the transition metal cations contained in the transition metal-containing solution added to the batch-type reactor is 0.5 or less,
wherein a pH in the batch-type reactor is maintained at 11.2 or less, and
wherein particle nucleation and particle growth are performed without changing the pH in the batch-type reactor during the co-precipitation reaction.
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