Pre-intercalation of potassium to improve the electrochemical performance of carbon-coated MoO3 cathode materials for lithium batteries

摘要: Abstract Low conductivity and irreversible structure change impede the practical use of MoO3 as cathode material for rechargeable lithium batteries. In this article, to address these issues, carbon-coated K-doped composite materials (KxMoO3@C) were prepared by hydrothermal treatment followed a high-temperature annealing. Benefiting from doped K+ ions, interlayer spacing crystal is expanded, layered stabilized at same time. Besides, electric KxMoO3 enhanced surface coating carbon layer. Consequently, electrochemical properties KxMoO3@C composites are improved remarkably. The as-prepared K0·046MoO3@C can deliver specific capacities 258 118 mAh g−1 current densities 30 3000 mA g−1 over potential range 1.5–4.0 V (vs. Li+/Li) respectively, displaying an outstanding rate capability. When cycled 1500 mA g−1, it retain 83.9% initial capacity after 500 cycles, exhibiting long-term span life. Our results suggest that synergistic effects interlayered doping ions significantly improve performance cathode, making promising be used in