Abstract
Improving rechargeable Na-ion batteries (NIB) with high specific capacity and stability is still a big challenge. In this report, P2-type Na0.4(Mn0.33Co0.33Ni0.33)O2 is act as a cathode material for NIBs prepared by hydrothermal method. SnO is coated on the surface of Na0.4(Mn0.33Co0.33Ni0.33)O2 layer to enhance its cycling stability. The coating of SnO is not influenced in the morphology of Na0.4(Mn0.33Co0.33Ni0.33)O2 which was confirmed by XRD and SEM analysis. HRTEM images illustrates that SnO is successfully wrapped around the surface Na0.4 (Mn0.33Co0.33Ni0.33)O2 it contributes a effective coating layer between the surface of the electrolyte and the Na0.4 (Mn0.33Co0.33Ni0.33)O2. The P2-type Na0.4(Mn0.33Co0.33Ni0.33)O2 material delivers 141 mAhg−1 of reversible capacity in a voltage range of 0–3.5 V. SnO coated P2-type Na0.4(Mn0.33Co0.33Ni0.33)O2 material exhibits good capacity of about ~80% after 100 cycles. On SnO coating the surface size of the P2-type Na0.4(Mn0.33Co0.33Ni0.33)O2 reduces the electrolyte decomposition and expedite the smooth transportation of Na+ ions. The surface modification on the P2-type Na0.4(Mn0.33Co0.33Ni0.33)O2 by the SnO nanorods is responsible for the enhanced electrochemical performances.
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