A positive electrode active material for a lithium secondary battery, the material comprising: a positive electrode active material particle; and an electrolyte-containing metal oxide coating layer formed on the surface of the positive electrode active material particle, the electrolyte-containing metal oxide coating layer including a metal oxide having a porous structure and an electrolyte having ionic conductivity and wherein the electrolyte-containing metal-oxide is formed by putting an ionic electrolyte into the metal oxide while forming the metal oxide to have the porous structure, and wherein a positive electrode active material of the positive electrode active material particle is at least one selected from the group consisting of materials having the following structure including: Li x MPO 4 (here, M is selected from the group consisting of iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), chromium (Cr), vanadium, molybdenum (Mo), titanium (Ti), aluminum (Al), niobium (Nb), and gallium (Ga), and 0.05≤x≤1.2); LiMO 2 (here, M is at least one selected from the group consisting of transition metal elements); LiNi x Co y Mn z O 2 (here, x + y + z = 1); xLiMO 2.(1-x)Li 2 M'O 3 (here, 0<x<1, M includes at least one metal element having an average oxidation number of +3 and includes at least one Ni element, and M' includes at least one metal element having an average oxidation number of +4); and LiM 2 O 4 (here, M is at least one selected from the group consisting of transition metal elements). a positive electrode active material particle; and an electrolyte-containing metal oxide coating layer formed on the surface of the positive electrode active material particle, the electrolyte-containing metal oxide coating layer including a metal oxide having a porous structure and an electrolyte having ionic conductivity and wherein the electrolyte-containing metal-oxide is formed by putting an ionic electrolyte into the metal oxide while forming the metal oxide to have the porous structure, and wherein a positive electrode active material of the positive electrode active material particle is at least one selected from the group consisting of materials having the following structure including: Li x MPO 4 (here, M is selected from the group consisting of iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), chromium (Cr), vanadium, molybdenum (Mo), titanium (Ti), aluminum (Al), niobium (Nb), and gallium (Ga), and 0.05≤x≤1.2); LiMO 2 (here, M is at least one selected from the group consisting of transition metal elements); LiNi x Co y Mn z O 2 (here, x + y + z = 1); xLiMO 2.(1-x)Li 2 M'O 3 (here, 0<x<1, M includes at least one metal element having an average oxidation number of +3 and includes at least one Ni element, and M' includes at least one metal element having an average oxidation number of +4); and LiM 2 O 4 (here, M is at least one selected from the group consisting of transition metal elements). Li x MPO 4 (here, M is selected from the group consisting of iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), chromium (Cr), vanadium, molybdenum (Mo), titanium (Ti), aluminum (Al), niobium (Nb), and gallium (Ga), and 0.05≤x≤1.2); LiMO 2 (here, M is at least one selected from the group consisting of transition metal elements); LiNi x Co y Mn z O 2 (here, x + y + z = 1); xLiMO 2.(1-x)Li 2 M'O 3 (here, 0<x<1, M includes at least one metal element having an average oxidation number of +3 and includes at least one Ni element, and M' includes at least one metal element having an average oxidation number of +4); and LiM 2 O 4 (here, M is at least one selected from the group consisting of transition metal elements).