Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 44, Issue 4, Pages 3253-3259Publisher
WILEY
DOI: 10.1002/er.5120
Keywords
Li-doping; oxygen redox activity; sodium ion battery
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Funding
- Scientific Research Fund of Anhui Provincial Education Department [KJ2017A030, KJ2018A038]
- National Natural Science Foundation of China [51602001]
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The discovery of the oxygen chemistry phenomenon reveals bright future toward new sustainable layered Na-based transitional oxides. However, the poor capacity retention problem of the cathode has hindered the development of sodium ion batteries (SIBs). In this work, a new Li-doped compound Li0.2Na1.0Mn0.8O2 is proposed, which demonstrates refined cycling durability with 51.6% after 100 cycles at 50 mA g(-1), superior than Na1.2Mn0.8O2 with only one cycle. Then in situ X-ray diffraction (XRD) and density function theory (DFT) are employed to explore the lattice distortion and confirm stable lattice framework introduced by Li atoms with eliminated P2-O2 phase transition upon cycling, guaranteeing outstanding electrochemically stable performance. In addition, Li0.2Na1.0Mn0.8O2 demonstrates activation of Mn as well as O chemistry redox in the lattice, detected by ex situ electronic paramagnetic resonance spectroscopy (EPR) as well as in situ Raman, which indicate not only Na-deficient Mn-based layered oxide but also Na-rich Mn-based compound can represent oxygen redox.
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