Positive Electrode Additive, Manufacturing Method Thereof, and Positive Electrode and Lithium Rechargeable Battery Including the Same

The present disclosure relates to a positive electrode additive, a manufacturing method thereof, and a positive electrode and a lithium rechargeable battery including the same. Specifically, one embodiment of the present disclosure provides a positive electrode additive for a lithium rechargeable battery comprising: a compound represented by the following Chemical Formula 1; a compound represented by the following Chemical Formula 2; and lithium phosphate (LiPO): LiNiMO [Chemical Formula 1] NiMPO [Chemical Formula 2]