Na-Rich Disordered Rock Salt Oxyfluoride Cathode Materials for Sodium Ion Batteries

被引:8
作者
Moghadam, Yasaman Shirazi [1 ]
Kharbachi, Abdel El [1 ]
Hu, Yang [1 ]
Wang, Kai [2 ]
Belin, Stephanie [3 ]
Fichtner, Maximilian [1 ,2 ]
机构
[1] Helmholtz Inst Ulm HIU, D-89081 Ulm, Germany
[2] Karlsruhe Inst Technol KIT, Inst Nanotechnol, D-76021 Karlsruhe, Germany
[3] SOLEIL Synchrotron, F-91192 Gif Sur Yvette, France
来源
ACS MATERIALS LETTERS | 2023年 / 5卷 / 01期
关键词
ELECTROCHEMICAL INTERCALATION; INSERTION; PERFORMANCE; DEINTERCALATION; COMPOUND; OXIDE;
D O I
10.1021/acsmaterialslett.2c00906
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The existing classes of Na-based cathode materials and their chemistries are still limited, mainly with respect to the increasing demand for alternative post-Li technologies. In this letter, a newly synthesized Na-rich disordered rock salt (DRS) oxyfluoride with the nominal composition Na2MnO2F is reported as a cathode candidate for Na-ion batteries (SIBs). Rietveld refinement analysis confirmed that the synthesized compound has a DRS structure with larger lattice compared to Li-rich homologues. During the first cycle, up to 1.7 Na+/f.u. can be extracted at a slow rate, while a better capacity retention and cycling stability are obtained at high rate, reminiscent of electrode-electrolyte interaction. Further, X-ray absorption fine structure (operando and ex situ) confirmed the Mn oxidation state evolution upon cycling in agreement with the cyclic voltammetry redox profile, emphasizing the reversible Na+ (de)insertion and change of the Mn local ordering. This work is an additional input to the limited series of cathode candidates for SIBs.
引用
收藏
页码:125 / 132
页数:8
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