In present study, fluorine substituted Li1.23Ni0.13Co0.14Mn0.56O2−z F z (z =0–0.20) are synthesized by simple and low-temperature co-precipitation process and observed enhancement in their electrochemical properties are investigated as function of fluorine substitutions. 19F MAS NMR analyses revealed the presence of fluorine as metal fluoride on the surface, and as oxy-fluoride in bulk Li1.23Ni0.13Co0.14Mn0.56O2−z F z . Li1.23Ni0.13Co0.14Mn0.56O2−z F z (z =0.15) showed improved cycling performance and reduced cell impedance as a result of the fluorine doping. In addition, fluorine substitution controlled the amount of stabilizing transition metals in the lithium layers of spinel-like regions, which in turn resulted in countering the capacity loss and voltage decay compared to Li1.23Ni0.13Co0.14Mn0.56O2.