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High stability of Cu-doped O3-type NaNi1/3Fe1/3Mn1/3O2 cathode material for sodium-ion battery.
- Source :
- Ionics; Jul2024, Vol. 30 Issue 7, p4021-4031, 11p
- Publication Year :
- 2024
-
Abstract
- In this work, Cu-doped O3-Na[Fe<subscript>1/3</subscript>Ni<subscript>1/3</subscript>Mn<subscript>1/3</subscript>]<subscript>1-x</subscript>Cu<subscript>x</subscript>O<subscript>2</subscript> cathodes were studied to enhance the structure stability and air stability. XPS analysis reveals that Cu-doping changes the electronic structure of Mn, thus enhancing the electrochemical performance of the NFM. The Cu-doped O3-Na[Fe<subscript>1/3</subscript>Ni<subscript>1/3</subscript>Mn<subscript>1/3</subscript>]<subscript>0.95</subscript>Cu<subscript>0.05</subscript>O<subscript>2</subscript> (NFMC-0.05) cathode remains a capacity of 81.6 mAh g<superscript>−1</superscript> at 10 C and keeps a capacity retention of 80.7% after 200 cycles at 0.5 C, while the undoped O3-NaFe<subscript>1/3</subscript>Ni<subscript>1/3</subscript>Mn<subscript>1/3</subscript>O<subscript>2</subscript> (NFM) can only remain a capacity of 59.9 mAh g<superscript>−1</superscript> at 10 C and keep a capacity retention of 68.9% after 200 cycles at 0.5 C. The 9-day air-exposed NFMC-0.05 exhibits a higher capacity of 97.3 mAh g<superscript>−1</superscript> than the 9-day air-exposed NFM (58 mAh g<superscript>−1</superscript>) at 0.1 C, showing greatly enhanced air stability. Moreover, Cu-doping reduces the Rct value and the polarization, leading to a significant improvement in electronic conductivity. These results confirm that a small quantity (5 at. %) of Cu-doping improves the structural stability and air stability of the material, leading to the excellent electrochemical performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09477047
- Volume :
- 30
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 178293916
- Full Text :
- https://doi.org/10.1007/s11581-024-05511-7