Li-rich layered composite Li[Li_0.2Ni_0.2Mn _0.6]O₂ synthesized by a novel approach as cathode material for lithium ion battery

Li-rich layered composite Li[Li_0.2Ni_0.2Mn _0.6]O₂ is prepared by a novel approach in which carbon felt acts as a carrier for synthesis reaction. The as-prepared material is characterized by SEM, ICP and XRD, its electrochemical performance is also examined with galvanostatic charge/discharge and CV measurements. It is showed that the facile process controls effectively the particle growth (in size around 100-200 nm) of the composite and its chemical composition. The as-prepared material shows a high initial discharge capacity about 288 mAh g^-1 when charged to 4.8 V, and a retained value of 246.8 mAh g^-1 in the 40th cycle. The crystalline structure of the composite is simulated further by Material Studio. It is revealed that the composite has a compatible layer structure merged by Li₂MnO₃ and LiNi_0.5Mn _0.5O₂, which makes substantial contribution to the cycleability of the electrode. In addition, the lithiation/delithiaion properties including charge transfer resistance and lithium ion diffusion coefficient are studied with electrochemical impedance spectra.