Positive electrode active material for lithium secondary battery and manufacturing method therefor

The present invention relates to a positive electrode active material and a manufacturing method therefor, wherein the positive electrode active material has a novel composition, a non-rock-salt structure, a novel local structure, and significantly increased electrochemical activity, thereby realizing high energy capacity and exhibiting greatly enhanced electrochemical performance. The positive electrode active material according to the present invention has a composition of [chemical formula 1] below, a layered structure of non-rock-salt structures, and excess lithium present inconsistent with the site balance, wherein the excess lithium enters octahedral sites and tetrahedral sites. [Chemical formula 1] Li 1+x+y M 1-y O 2 (x is the amount of excess lithium entering tetrahedral sites between a lithium layer and a transition metal layer; y is the amount of excess lithium entering octahedral sites of the transition metal layer; x and y are values satisfying charge neutrality, 0

Keywords:

• Lithium
• Electrode
• Battery (electricity)
• Chemical formula
• Transition metal
• Octahedron
• Crystallography
• Tetrahedron
• Electrochemistry
• Materials science

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