One-pot synthesis of aluminum oxide coating and aluminum doping on lithium manganese oxide nanoparticles for high performance energy storage system

摘要

AbstractIn the present study, in order to demonstrate the one-pot synthesis of aluminum oxide (Al2O3) coating and aluminum doping, we synthesized aluminum oxide (Al2O3)-coated LiAlxMn2-xO4(LAMO) NPs using a sequential process of the as-spun nanofiber templates, chemical precipitation, and calcination as a cathode material in lithium ion batteries (LIBs). To find the optimum condition of Al2O3coating layer and Al doping, we performed the simple calcination methods at 300?°C using the Al(OH)2-coated LMO NPs. The resultant Al2O3-coated LAMO NPs exhibited the highest capacity of 111.1?mAh g?1with the capacity retention of 94.4% after 90 cycles at 1?C, excellent rate performance, and the highest high-rate capacity of 81.4?mAh g?1at 10?C as compared to bare LMO NPs without Al2O3coating and Al(OH)2-coated LMO NPs without calcination. The improved electrochemical performance can be defined by the co-effect of Al2O3coating and Al doping on bare LMO NPs. The former is related to cycle stability that increased due to the prevention of volume expansion and Mn dissolution as a physical buffer layer. The latter is related to high-rate performance improved due to the enhanced bonding energy of AlO bond. Therefore, it can be concluded that Al2O3-coated LAMO NPs are promising candidate cathode materials for high-performance LIBs.Highlights?One-pot synthesis of Al2O3-coated LiAlxMn2-xO4for high-performance cathode materials.?Synergistic effects of the Al2O3coating and Al doping on LiMn2O4.?Outstanding structural stability, cycle durability, and high-rate performance.?Superior electrochemical performance with high-rate performance for lithium storage.]]>