Lg Chem, Ltd

Myung Gi Jeong

Seung Beom Cho

Sang Soon Choi

Se Hwan Son

Sang Won Woo

A positive electrode active material includes a lithium transition metal oxide, in which a cobalt content in the lithium transition metal oxide is less than a manganese content, wherein at least one of nickel, cobalt, and manganese in the lithium transition metal oxide has a concentration gradient that gradually changes from a center of a particle to a surface thereof, the positive electrode active material is in the form of a secondary particle formed by agglomeration of primary particles, and a ratio in which angles between c-axis directions, which are measured at at least 8 points on a surface of the positive electrode active material by TEM analysis, and a growth direction of the particle at the measuring point satisfy 85&#xb0; to 95&#xb0; is 60% or more.

Positive electrode active material for lithium secondary battery, method of preparing the same, and positive electrode for lithium secondary battery and lithium secondary battery which include the positive electrode active material

The present disclosure relates to a precursor of a positive electrode active material for a secondary battery including a single layer-structured secondary particle in which pillar-shaped primary particles radially oriented in a surface direction from the particle center are aggregated, wherein the secondary particle has a shell shape, and the primary particle includes a composite metal hydroxide of Ni&#x2014;Co&#x2014;Mn of the following Chemical Formula 1, and a positive electrode active material prepared using the same:NiCoMMn(OH)&#x2003;&#x2003;[Chemical Formula 1] In Chemical Formula 1, M, x, y and z have the same definitions as in the specification.

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Daejeon, South Korea

Myung Gi Jeong