Positive Electrode Active Material Particle Including Core Including Lithium Cobalt Oxide And Shell Including Lithium Cobalt Phosphate And Preparation Method Thereof

Provided is a positive electrode active material particle including a core that includes lithium cobalt oxide represented by the following Chemical Formula 1; and a shell that is located on the surface of the core and includes lithium cobalt phosphate represented by the following Chemical Formula 2, wherein the shell has a tetrahedral phase: LiCoMOA (1) LiCoPO (2)