IRON OXYHYDROXYNITRATE HAVING PHOSPHORIC ACID ANION-ADSORBED SURFACE, PREPARATION METHOD THEREFOR, CATHODE COMPRISING IRON OXYHYDROXYNITRATE HAVING PHOSPHORIC ACID ANION-ADSORBED SURFACE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

Disclosed is a modified iron oxyhydroxynitrate including iron oxyhydroxynitrate and hydrogen phosphate ions adsorbed on a surface thereof. Also disclosed is a method for preparing the same, a positive electrode for a lithium secondary battery including the modified iron oxyhydroxynitrate as a positive electrode additive, and a lithium secondary battery including the same.