Molybdenum-Doped Li/Mn-Rich Layered Transition Metal Oxide Cathode Material Li_1.2Mn_0.6Ni_0.1Co_0.1O₂ with High Specific Capacity and Improved Cyclic Stability for Rechargeable Li-Batteries

Abstract

A series of cathode materials, Li1.2Mn0.6–xNi0.1Co0.1MoxO2 (x = 0, 0.005, and 0.01), are synthesized via the sol–gel method. Structural characterization revealed that the Mo-doped material shows a well-defined ordered layered structure having less cation mixing. The Li1.2Mn0.59Ni0.1Co0.1Mo0.01O2 (LMRMo#0.01) cathode shows a high specific discharge capacity of 193.9 mAh g–1 with an initial Coulombic efficiency of 81.4% at room temperature and an excellent cyclic stability with a discharge capacity of ∼175.3 mAh g–1 (capacity retention 92.5%) after 250 cycles at 0.1 C. Substitution of Mn4+ by Mo6+ leads to low charge transfer resistance and enhancement in the stability of the layered structure, which result in outstanding electrochemical performance of the Mo-doped cathode.