Investigation on the Electrochemical Properties and Stabilized Surface/Interface of Nano-AlPO4-Coated Li1.15Ni0.17Co0.11Mn0.57O2 as the Cathode for Lithium-Ion Batteries

Being considered as one of the most potential cathode materials, Li1.15Ni0.17Co0.11Mn0.57O2 draws plenty of attention towards its optimization on cycling and rate performance. The surface coating process provides a longer cycling life and better rate performance for the cathodes. A systematic investigation has been carried out on the nano-AlPO4 coating layer for the Li1.15Ni0.17Co0.11Mn0.57O2 cathode material through a facile in situ dispersion process. The 1% coated cathode material can hold about 90% capacity retention after 100 cycles. Besides, the surface coating enhances the rate ability of Li1.15Ni0.17Co0.11Mn0.57O2, which holds a reversible capacity of 202.3 mAh g–1 at the rate of 1C. Surface information is collected during cycling, which reveals that less side reactions occur on the electrode–electrolyte interface after the coating process for improved cycling and rate performance.