Electrode performance of P′2-Na2/3[Mn1-xScx]O2 in sodium batteries
P′2-Na2/3MnO2 is one of the promising candidates of high-capacity positive electrode material showing >200 mAh g−1 for Na-ion batteries. However, it suffers capacity decay during electrochemical cycling. In this study, we used Sc3+ ions ([Ar]4s03d0) as a dopant for P′2-Na2/3MnO2 and successfully...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Electrochemistry Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S138824812500030X |
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| Summary: | P′2-Na2/3MnO2 is one of the promising candidates of high-capacity positive electrode material showing >200 mAh g−1 for Na-ion batteries. However, it suffers capacity decay during electrochemical cycling. In this study, we used Sc3+ ions ([Ar]4s03d0) as a dopant for P′2-Na2/3MnO2 and successfully synthesized series of doped materials, P′2-Na2/3[Mn1-xScx]O2. Electrochemical cycle stability of the Sc doped samples in Na cells is successfully improved by the doping without sacrificing reversible capacity. Since Sc3+ ion having no 3d-electrons can be partially substituted for Jahn-Teller active Mn3+ ions ([Ar]4s03d4), loss of the crystallinity over cycling is mitigated through suppressing the structural transformation including Na/vacancy ordering. The finding provides the insight to design the long-life layered cathode materials for Na-ion batteries. |
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| ISSN: | 1388-2481 |