203 / 2022-02-14 22:14:30

One-step route to Fe2O3 and FeSe2 nanoparticles loaded on carbon-sheet for lithium storage

Lithium-ion battery; Anode materials; Fe2O3@Composite; FeSe2@C composite

（7）矿物与先进能源材料 > 5. 电池材料及其废弃物管理

Iron-based anode materials such as Fe₂O₃ and FeSe₂ have attracted widespread attention for lithium-ion battery due to their high capacities and abundant reserves. However, the capacity decays seriously because of the poor conductivity and severe volume expansion, which greatly limits their practical application. Designing nanostructure and combined with carbon are effective means to improve cycling stability, because of that the incorporated carbon not only can act as a structural buffer to effectively alleviate the volume expansion, but also significantly improve the conductivity, and the nanostructure of the synthesized materials could afford space for lithium intercalation and extraction processes. In this work, ultra-small Fe₂O₃ nanoparticles loaded on carbon framework were synthesized through a one-step thermal decomposition of the commercial C₁₅H₂₁FeO₆ [Iron (III) acetylacetonate], which could be served as the source of Fe, O, and C. As an anode material, the Fe₂O₃@C anode delivers a specific capacity of 747.8 mAh g^-1 after 200 cycles at 200 mA g^-1 and 577.8 mAh g^-1 after 365 cycles at 500 mA g^-1. What’s more, the synthetic strategy can be simply extended to prepare other iron-based anode material, FeSe₂@C for instance also showing good cycling performance.