A peanut-like hierarchical micro/nano-Li1.2Mn0.54Ni0.18Co0.08O2 cathode material for lithium-ion batteries with enhanced electrochemical performance

Abstract

A novel peanut-like hierarchical micro/nano-lithium-rich cathode material Li_1.2Mn_0.54Ni_0.18Co_0.08O₂ has been successfully synthesized via a facile solvothermal method combined with a calcination process. XRD patterns show that the as-prepared sample has high crystallinity and a well-formed layered structure. As a cathode material for Li-ion batteries, this oxide exhibits high capacity, good cyclic stability and superior rate capability. It delivers a discharge capacity of 229.9 mA h g⁻¹ at a current density of 200 mA g⁻¹ between 2.0 and 4.8 V with a high capacity retention of 94.2% after 100 cycles. High reversible discharge capacities of 198.3, 167.5 and 145 mA h g⁻¹ are obtained at 400, 1000 and 2000 mA g⁻¹, respectively. This excellent electrochemical performance is attributed to the hierarchical micro/nanostructure.