High-Voltage Cathode α-Fe2O3Nanoceramics for Rechargeable Sodium-Ion Batteries
Hanqing Dai (Fudan University)
Wenqian Xu (Nanjing University of Posts and Telecommunications)
Zhe Hu (Fudan University)
Jing Gu (Nanjing University of Posts and Telecommunications)
Yuanyuan Chen (Fudan University)
Ruiqian Guo (Fudan University)
Kouchi Zhang (TU Delft - Electronic Components, Technology and Materials)
Wei Wei (Nanjing University of Posts and Telecommunications)
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Abstract
Previously, α-Fe2O3 nanocrystals are recognized as anode materials owing to their high capacity and multiple properties. Now, this work provides high-voltage α-Fe2O3 nanoceramics cathodes fabricated by the solvothermal and calcination processes for sodium-ion batteries (SIBs). Then, their structure and electrical conductivity were investigated by the first-principles calculations. Also, the SIB with the α-Fe2O3 nanoceramics cathode exhibits a high initial charge-specific capacity of 692.5 mA h g-1 from 2.0 to 4.5 V at a current density of 25 mA g-1. After 800 cycles, the discharge capacity is still 201.8 mA h g-1, well exceeding the one associated with the present-state high-voltage SIB. Furthermore, the effect of the porous structure of the α-Fe2O3 nanoceramics on sodium ion transport and cyclability is investigated. This reveals that α-Fe2O3 nanoceramics will be a remarkably promising low-cost and pollution-free high-voltage cathode candidate for high-voltage SIBs.
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