Optimization of synthesis parameters for uniform sphere-like Li1.2Mn0.54Ni0.13Co0.13O2 as high performance cathode material for lithium ion batteries

Lithium-rich layered oxide materials of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ have been successfully synthesized through a facile one-step coprecipitation method without the use of any toxic chelating agent. The structure and morphology of the as-prepared Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode material were well optimized by tuning synthesis parameters including the co-precipitation pH value, the feeding rate of metal precursors and the reaction temperature. The optimal Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ spherical particles present well-ordered layer structure and low cation-mixing degree. As a result, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as a cathode material presents excellent reversible capacity, rate capability, and cycling performance, which delivers a high initial discharge capacity of 255 mAh g⁻¹ and 172 mAh g⁻¹ at 0.1 C and 1 C, respectively. Moreover, a discharge capacity of 155 mAh g⁻¹ can be maintained even after 300 cycles at 1 C, corresponding to a capacity retention as high as 81%.