The effect of Ti doping on electrochemical properties of Li1.167Ni0.4Mn0.383Co0.05O2 for lithium-ion batteries

Li1.167Ni0.4-xMn0.383Co0.05TixO2 (x = 0, 0.02, 0.04 and 0.08) cathode materials have been synthesized via a co-precipitation method followed by a solid state reaction. The effects of Ti additive on the crystal structure features and electrochemical properties of the powders are studied in detail using X-ray (XRD), Scanning Electron Microscopy (SEM), galvanostatic charge-discharge test and Cyclic voltammetry (CV). It is found that Ti doping don't destroy the layered structure of Li1.167Ni0.4Mn0.383Co0.05O2, but can stabilize the crystal structure. The results showed Ti additive played an important role in the good cycling performance of Li1.167Ni0.4-xMn0.383Co0.05TixO2. In contrast, 0.04 Ti doped cathode material shows better cycle performance than bare sample. The Li1.167Ni0.36Mn0.383Co0.05Ti0.04O2 delivers an initial discharge capacity of 186.6 mAh/g at 0.1 C in the cut-off voltage of 2.0-4.8 V and has a capacity retention of 99.4% after 10 cycles at 0.1 C.