Rational Construction of 2D Fe3O4@Carbon Core–Shell Nanosheets as Advanced Anode Materials for High-Performance Lithium-Ion Half/Full Cells

摘要: Transition metal oxides have vastly limited practical application as electrode materials for lithium-ion batteries (LIBs) due to their rapid capacity decay. Here, a versatile strategy mitigate the volume expansion and low conductivity of Fe3 O4 by coating thin carbon layer on surface nanosheets (NSs) was employed. Owing 2D core-shell structure, @C NSs exhibit significantly improved rate performance cycle capability compared with bare NSs. After 200 cycles, discharge at 0.5 A g-1 963 mA h g-1 (93 % retained). Moreover, reaction mechanism lithium storage studied in detail ex situ XRD HRTEM. When coupled commercial LiFePO4 cathode, resulting full cell retains 133 mA h g-1 after 100 cycles 0.1 A g-1 , which demonstrates its superior energy performance. This work provides guidance constructing oxide/carbon composites high cost field storage.