Na0.4(Mn0.33Co0.33Ni0.33)O2 surface grafted with SnO nanorods: A cathode materials for rechargeable sodium ion batteries

Improving rechargeable Na-ion batteries (NIB) with high specific capacity and stability is still a big challenge. In this report, P2-type Na-0.4(Mn0.33Co0.33Ni0.33)O-2 is act as a cathode material for NIBs prepared by hydrothermal method. SnO is coated on the surface of Na-0.4(Mn0.33Co0.33Ni0.33)O-2 layer to enhance its cycling stability. The coating of SnO is not influenced in the morphology of Na-0.4(Mn0.33Co0.33Ni0.33)O-2 which was confirmed by XRD and SEM analysis. HRTEM images illustrates that SnO is successfully wrapped around the surface Na-0.4(Mn0.33Co0.33Ni0.33)O-2 it contributes a effective coating layer between the surface of the electrolyte and the Na-0.4(Mn0.33Co Ni-0.33(0.33))O-2. The P2-type Na-0.4(Mn0.33Co0.33Ni0.33)O-2 material delivers 141 mAhg(-1) of reversible capacity in a voltage range of 0-3.5 V. SnO coated P2-type Na-0.4(Mn0.33Co0.33Ni0.33)O-2 material exhibits good capacity of about similar to 80% after 100 cycles. On SnO coating the surface size of the P2-type Na-0.4(Mn0.33Co0.33Ni0.33)O-2 reduces the electrolyte decomposition and expedite the smooth transportation of Na+ ions. The surface modification on the P2-type Na-0.4(Mn0.33Co0.33Ni0.33)O-2 by the SnO nanorods is responsible for the enhanced electrochemical performances.