3C 2(OH) 2 coated Li(Ni 0.6Co 0.2Mn 0.2)O 2 cathode material with enhanced electrochemical properties for lithium ion battery]]>

摘要

Ti3C2(OH)2coated nickel-rich LiNi0.6Co0.2Mn0.2O2cathode material is prepared with wet coating process. The effects of the Ti3C2(OH)2concentration on the structure and electrochemical performance of LiNi0.6Co0.2Mn0.2O2cathode materials are investigated. The microanalyses show that Ti3C2(OH)2is successfully coated on the surface of LiNi0.6Co0.2Mn0.2O2cathode material. All cathode materials display the excellent hexagonal ordering and the low ratio ofI(006+102)/I(101). Furthermore, the Ti3C2(OH)2coated cathode materials presents excellent cycling capability and rate capability. Among them, the 3.0?wt.% Ti3C2(OH)2coated LiNi0.6Co0.2Mn0.2O2displays the highest discharge capacity of 124.5?mAh/g with the capacity retention of 86.4% after 200 cycles at 0.5?C, and the best rate performance at high current density. So Ti3C2(OH)2coating is good promising material for LiNi0.6Co0.2Mn0.2O2to improve the long-life and rate capability.