PMoO12@NH2-MIL-53(Fe)-derived iron molybdate/iron oxide with nitrogen-doped carbon nanocomposites as anodes for lithium-ion batteries

Transition metal oxides (TMOs) possess the distinct advantage of high theoretical specific capacity and are considered as one of the promising alternatives to carbon-based anode materials for lithium-ion batteries. However, the significant volume expansion experienced by TMOs during lithiation and delithiation processes leads to rapid capacity fading, thereby limiting their widespread applications. In this study, we synthesized PMoO12@NH2-MIL-53(Fe) precursors through a solvothermal method followed by high-temperature treatment to obtain FeMoO4/Fe2O3-NC nanocomposites. The inclusion of FeMoO4 as a crucial component not only provides a large capacity but also enhances the performance due to the synergistic effects with Fe2O3. The resulting multicomponent FeMoO4/Fe2O3-NC nanoparticles exhibit exceptional cycling stability and rate capability. Under optimized conditions, the specific capacity of FeMoO4/Fe2O3-NC can be maintained at approximately 1021 mAh g(-1) after 100 cycles at a current density of 100 mA g(-1), while achieving an average specific capacity of up to 862 mAh g(-1) even under high current densities such as 500 mA g(-1). In conclusion, the research potential of FeMoO4/Fe2O3-NC anodes for lithium-ion batteries is worth more attention.

Automated summary

Transition metal oxides (TMOs) have high theoretical specific capacity and are considered as promising alternatives to carbon-based anode materials for lithium-ion batteries. However, they suffer from rapid capacity fading during cycling. This study successfully synthesized FeMoO4/Fe2O3-NC nanocomposites, which exhibit exceptional cycling stability and rate capability.