High-performance ternary metal oxide anodes for lithium storage

Metal oxide anodes which can achieve high lithiation capacities by conversion mechanism are promising in lithium storage systems. The main obstacle to their practical applications is poor cycling performance. Regulating element ratio of multi-metal materials is effective for improving their electrochemical properties. Herein, optimized Mn-Ni-Co-O anode materials with long-cycle stability are reported. The improvement is associated with proper element ratio, which enables accelerated Li+ ion diffusion and high-stability LiF-rich solid electrolyte interphase (SEI) layer. As a result, (Ni0.1Co0.3Mn0.6)(3)O-4 materials deliver lithiation capacities of 500 mAh g(-1) after 1500 cycles at the current density of 1 A g(-1). It is greatly better than other samples with different element ratio. Then, application properties of (Ni0.1Co0.3Mn0.6)(3)O-4 materials are evaluated by assembled with active carbon and LiFePO4 for energy storage devices, respectively. The obtained Li-ion capacitor exhibits high energy densities of 112 Wh kg(-1) based on total mass of oxides and active carbon. The obtained Li-ion battery also shows good cycle stability. These results suggest lithiation capacity fade of metal oxide anodes can be mitigated by controlling their component contents. This low-cost and high effective way is to promote commercial applications of metal oxide anode materials in energy storage systems.