Low volume expansion hierarchical porous sulfur-doped Fe₂O₃@C with high-rate capability for superior lithium storage

Abstract

Ingenious morphology design and doping engineering have remarkable effects on enhancing conductivity and reducing volume expansion, which need to be improved by transition metal oxides serving as anode materials for...

Longan-Derived Biomass Carbon-Induced Cubic-Type Ferric Oxide Nanoparticles for Efficient Lithium-Ion Battery Anodes

“…Interestingly, Fe 2 O 3 is regarded as a promising candidate for LIB anode materials because of its high theoretical specific capacity of 1007 mAh g –1 and relatively low voltage platform compared to a large number of transition metal compounds (e.g., Co 3 O 4 , NiO, CuO, etc. ). − Unfortunately, the poor electrical conductivity, notable volume expansion, and aggregation during the charge/discharge process make iron oxide electrodes susceptible to pulverization, resulting in poor rate performance, fast capacity fading, and short cycle life. − Considerable efforts have been made to alleviate the existing issues, especially to reduce Fe 2 O 3 particles from microsized to nanosized, design special morphologies to alleviate the volume expansion (e.g., nanoplates, nanotubes, nanospheres, nanosheets), and also composite with other materials, especially highly electrically conductive carbon materials. , …”

Core‐Shell Architectured Sulfur Coated α‐Fe2O3 Nano‐Sheet Anode for Li‐Ion Battery with Insitu Active Solid Electrolyte Interfacial Layer and Li‐Sulfur Energy Storage Systems

“…During the first negative scan, a slight cathodic hump is observed at 1.7 V, which might be attributed to the initial lithium‐ion intercalation from pure lithium metal to bare α‐Fe 2 O 3 due to the Fe 3+ to Fe 2+ reduction that leads to the formation of Li 2 Fe 2 O 3 as indicated in equation (1). A broad and deep cathodic peak emerges at 0.67 V [68] might be attributed to the Li + ion intercalation into α‐Fe 2 O 3 due to further multi‐step reduction of Fe 2+ to Fe 0 contributing formation of metallic Fe along with reversible amorphous Li 2 O by conversion reaction mechanism. Furthermore, this deep shallow broad peak is also associated with irreversible Li + capture by surface‐adsorbed air molecules, leading to the undesired SEI formation on the surface of the α‐Fe 2 O 3 working electrode.…”