The effect of Na content on the electrochemical performance of the O3-type NaxFe0.5Mn0.5O2 for sodium-ion batteries
Owing to the abundant storage and environmentally benign of Na, Fe, and Mn elements, FeMn-based O3-type NaFe 0.5 Mn 0.5 O 2 materials were considered to be a promising cathode for sodium-ion batteries. However, the poor rate performance was barely satisfactory to the commercial production. Here, dif...
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Veröffentlicht in: | Journal of materials science 2019-05, Vol.54 (9), p.7156-7164 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Owing to the abundant storage and environmentally benign of Na, Fe, and Mn elements, FeMn-based O3-type NaFe
0.5
Mn
0.5
O
2
materials were considered to be a promising cathode for sodium-ion batteries. However, the poor rate performance was barely satisfactory to the commercial production. Here, different Na content O3-type Na
x
Fe
0.5
Mn
0.5
O
2
(
x
= 1, 0.9, 0.8) for sodium-ion batteries were synthesized by solid-state reaction. The results illustrated that Na-deficient compound was beneficial to improve the rate performance and discharge capacity. Due to the Na-deficient in the octahedral sites, O3-type Na
0.8
Fe
0.5
Mn
0.5
O
2
achieved a discharge capacity of 179 mAh g
−1
at 0.1 C, which is relatively higher than that of O3-type NaFe
0.5
Mn
0.5
O
2
(145 mAh g
−1
). Besides, the O3-type Na
0.8
Fe
0.5
Mn
0.5
O
2
exhibited an initial discharge capacity of 126 mAh g
−1
and outstanding capacity retention of 82.6% after 60 cycles at 1C. The excellent performance indicates that nontoxic and earth-abundant Na-deficient O3-type cathode may be a promising cathode for large-scale application and development of sodium-ion batteries. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-018-03277-8 |