High-Voltage Cathode α-Fe2O3Nanoceramics for Rechargeable Sodium-Ion Batteries

Hanqing Dai, Wenqian Xu, Zhe Hu, Jing Gu, Yuanyuan Chen, Ruiqian Guo, Guoqi Zhang, Wei Wei

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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.

Original languageEnglish
Pages (from-to)12615–12622
Number of pages8
JournalACS Omega
Volume6
Issue number19
DOIs
Publication statusPublished - 2021

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