CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 10/0525 (2013.01); C01P 2002/54 (2013.01); C01P 2002/60 (2013.01); C01P 2002/72 (2013.01); C01P 2002/77 (2013.01); C01P 2002/78 (2013.01); C01P 2002/85 (2013.01); C01P 2004/04 (2013.01); C01P 2004/50 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] | 17 Claims |
1. A lithium composite oxide, comprising:
primary particles enabling lithium intercalation and deintercalation and a secondary particle in which the primary particles are aggregated,
wherein the lithium composite oxide comprises niobium (Nb) as dopant,
wherein a content of niobium (Nb) has a gradient decreasing from a surface region of the secondary particle to a core of the secondary particle, and
an interplanar distance (d1) of a (003) plane of a crystal structure in the primary particle and an interplanar distance (d2) of a (400) plane of a crystal structure in an interface between the primary particles satisfy Relational Expression 1 below.
d1−d2>0.0005 Relational Expression 1.
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