Erythrocyte‐Like Single Crystal α‐Fe₂O₃ Anode Synthesized by Facile One‐Step Hydrothermal Method for Lithium‐Ion Battery

Abstract

Transition metal oxides Fe2O3 as lithium‐ion battery anode has aroused intense interest as a result of its high capacity (1007 mA h g−1). Nevertheless, the significant volume expansion during the cycling procession causes its capacity to decay sharply as the anode of lithium‐ion battery. The size and morphology of materials are important factors improving the stability of electrode materials. However, most of the excellent morphology design needs complex processes. The single‐crystalline erythrocyte‐like α‐Fe2O3 nanoparticles are synthesized by one‐step hydrothermal method to improve the electrochemical properties of the α‐Fe2O3 anode, and the Li+ storage kinetics of the erythrocyte‐like α‐Fe2O3 anode are investigated. As a lithium‐ion battery anode material, the erythrocyte‐like α‐Fe2O3 anode exhibits an eminent reversible capacity of 1200.2 mA h g−1 at 0.1 C after 100 cycles. In comparison to raw α‐Fe2O3, the erythrocyte‐like α‐Fe2O3 performs with a better rate property. The special morphological design can effectively improve the stability of α‐Fe2O3 electrode 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

“…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. In the reverse scan, a significant sharp anodic peak is observed at 1.6 V along with a small hump at 1.89 V, which are correlated with the two step oxidation processes of Fe 0 to Fe 2 + and Fe 2 + to Fe 3 + , [11] respectively. During the first step of oxidation (i. e., Fe 0 to Fe 2 + ), the metallic 'Fe' reacts with Li Based on the redox pattern, a part of lithium-ion might be retained with Fe 2 O 3 structure in the form of an alloy as explained above.…”

“…Consequently, they can offer significantly higher theoretical specific capacity and operating voltage, thereby increasing the energy density of LIBs than conventional graphite anode. With these objectives, TMOs such as M x O y (M = Ni, [7] Mn, [8] Fe, [9][10][11] Co, [12] and Cu, [13] etc) possessing significant theoretical capacities have been extensively studied recently. Among these TMOs utilized for LIBs, Fe 2 O 3 has emerged due to its amicable higher theoretical capacity of auspicious anode material due to its high theoretical capacity of 1007 mAh g À 1 , [14,15] good thermal stability, chemical compatibility, and natural abundance.…”

“…[25] Due to its excellent benefits, the α-Fe 2 O 3 electrode is widely used as a negative electrode to store alkali ions such as Li + , Na + , and K + . [26] However, there are some of the commonly encountered challenges in using metal oxides as a negative electrode for LIBs, including (Hematite)-α-Fe 2 O 3 as follows: low electronic conductivity due to its semiconducting nature of (Hematite-α-Fe 2 O 3 is a charge transfer insulator), significant volume changes in the course of Li-ion insertion/de-insertion process resulting in the poor cycling stability, particle pulverization coupled with poor electrical conductivity due to the drop down of electrical contact among the electrode particles, Initial Capacity Fading (ICF), [27] formation of passivation layer, [11] and sluggish Li-ion kinetics. These crucial factors lead to rapid capacity degradation and descending lifespan upon prolonged electrochemical cycling in metal oxide anodes, limiting the real-time applications of LIB systems.…”

Exploring the Mechanism of Single‐Crystal MnO2 as Cathodes for Zinc Ion Batteries

“…Thus, we synthesized single-crystal β-MnO 2 through a common hydrothermal method and investigated its reaction mechanism and unique properties, paving the way for the long-term application of single-crystal structures in ZIBs. [42][43][44] In this paper, we employed hydrothermal nanotechnology to synthesize single-crystal MnO 2 (S-MnO 2 ). By harnessing the advantages of the single-crystal structure, we optimized the structural stability, ion conductivity, surface reactions, and phase control of the cathode material, thereby improving the performance and cycle life of the battery.…”

“…While studies have reported the use of single‐crystal materials as cathode materials to address specific capacity issues in battery systems, the underlying reaction mechanism has remained unexplored. Thus, we synthesized single‐crystal β‐MnO 2 through a common hydrothermal method and investigated its reaction mechanism and unique properties, paving the way for the long‐term application of single‐crystal structures in ZIBs [42–44] …”