Structure and electrochemical performance of nanosized Li1.1(Ni0.35Co0.35Mn0.30)O2 powders for lithium-ion battery
Pure Li 1.1 Ni 0.35 Co 0.35 Mn 0.30 O 2 nanosized powders have been successfully synthesized by improved hydroxide co-precipitation method, and characterized with X-ray powder diffraction and scanning electron microscopy (SEM). The electrochemical properties of cathodes and Li 1.1 Ni 0.35 Co 0.35 Mn 0.30 O 2/ Li 4 Ti 5 O 12 full cells have been studied by charge–discharge tests and cyclic voltammetry. The Li 1.1 Ni 0.35 Co 0.35 Mn 0.30 O 2 powders have a typical layered hexagonal crystal structure with an average particle size of about 780 nm. The cathodes exhibit high capacities and good cycling performance. The initial discharge capacity of the cathodes is 154.8 mAhg-1 at 0.5 C between 2.5 V and 4.3 V, and the capacity retention keeps 80.6% after 50 charge–discharge cycles. The Li 1.1 Ni 0.35 Co 0.35 Mn 0.30 O 2/ Li 4 Ti 5 O 12 cells also deliver high specific capacities, good cycling stability and rate capability. This work demonstrates that Li 1.1 Ni 0.35 Co 0.35 Mn 0.30 O 2 is a promising cathode material for lithium-ion batteries.