1.2Mn 0.54Ni 0.13Co 0.13O 2 cathode materials for lithium-ion batteries with enhanced electrochemical performance]]>

摘要

AbstractSn-doped Li-rich layered oxides of Li1.2Mn0.54-xNi0.13Co0.13SnxO2have been synthesized via a sol-gel method, and their microstructure and electrochemical performance have been studied. The addition of Sn4+ions has no distinct influence on the crystal structure of the materials. After doped with an appropriate amount of Sn4+, the electrochemical performance of Li1.2Mn0.54-xNi0.13Co0.13SnxO2cathode materials is significantly enhanced. The optimal electrochemical performance is obtained atx?=?0.01. The Li1.2Mn0.53Ni0.13Co0.13Sn0.01O2electrode delivers a high initial discharge capacity of 268.9?mAh?g?1with an initial coulombic efficiency of 76.5% and a reversible capacity of 199.8?mAh?g?1at 0.1 C with capacity retention of 75.2% after 100 cycles. In addition, the Li1.2Mn0.53Ni0.13Co0.13Sn0.01O2electrode exhibits the superior rate capability with discharge capacities of 239.8, 198.6, 164.4, 133.4, and 88.8?mAh?g?1at 0.2, 0.5, 1, 2, and 5 C, respectively, which are much higher than those of Li1.2Mn