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Correlation between the Cation Disorders of Fe 3+ and Li + in P3-Type Na 0.67 [Li 0.1 (Fe 0.5 Mn 0.5 ) 0.9 ]O 2 for Sodium Ion Batteries
Various Fe-based layered oxide materials have received attention as promising cathode materials for sodium ion batteries because of their low cost and high specific capacity. Only a few P3-type Fe-based oxide materials, however, have been examined as cathodes because the synthesis of highly crystall...
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Published in: | ACS applied materials & interfaces 2022-07, Vol.14 (29), p.33120-33129 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Various Fe-based layered oxide materials have received attention as promising cathode materials for sodium ion batteries because of their low cost and high specific capacity. Only a few P3-type Fe-based oxide materials, however, have been examined as cathodes because the synthesis of highly crystalline P3-type Fe-based oxides is not facile. For this reason, the structural merits of the P3 structure are not yet fully understood. Herein, highly crystalline P3-type Na
[Li
(Fe
Mn
)
]O
heated at 900 °C is introduced to improve the electrochemical performance of Fe-based layered oxides. The structures, reaction mechanisms, and electrochemical performances of P3 Na
[Li
(Fe
Mn
)
]O
, P2 Na
[Li
(Fe
Mn
)
]O
, and P2 Na
[Fe
Mn
]O
are compared to demonstrate the roles of Li
doping in the improved electrochemical performance of P3 Na
[Li
(Fe
Mn
)
]O
, such as stable capacity retention over 100 cycles. P3 Na
[Li
(Fe
Mn
)
]O
significantly suppresses the migration of Fe
ions to tetrahedral sites in the Na layer during cycling because the cation disorder of Li
is more favorable than that of Fe
. As a result, P3 Na
[Li
(Fe
Mn
)
]O
shows better cycle performance than P2 Na
[Fe
Mn
]O
. P3 Na
[Li
(Fe
Mn
)
]O
also exhibits an improved rate performance compared to P2 Na
[Fe
Mn
]O
. This finding provides fundamental insights to improve the electrochemical performance of layered oxide cathode materials for sodium ion batteries. |
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ISSN: | 1944-8244 1944-8252 |
DOI: | 10.1021/acsami.2c05784 |