A High-Entropy Intergrowth Layered-Oxide Cathode with Enhanced Stability for Sodium-Ion Batteries.
ChemSusChem
; : e202400768, 2024 Jun 13.
Article
em En
| MEDLINE
| ID: mdl-38868981
ABSTRACT
Layered transition metal oxides are widely considered as ideal cathode materials for SIBs. However, the existing P2 and O3 structures possess specific issues, which limit their practical applications. To address these issues, this work designed a novel intergrowth layered oxide cathode with P2 and O3 phases by implementing Cu and Ti into the structure with the formation of high-entropy cathode materials with superior performance for SIBs. The electrochemical test results show that the optimized high-entropy cathode with the P2/O3 intergrowth structure possesses a high initial discharge capacity of 157.85â
mAh g-1 at 0.1â
C, an excellent rate performance of 84.41â
mAh g-1 at 10â
C, and long-term stability with capacity retention of 83.25 % after 500 cycles at 5â
C. Furthermore, the analysis results of ex situ XRD and inâ
situ XRD indicate that the adverse phase transition of P2-O2 under high voltage is effectively suppressed. This work indicates that the integration of high-entropy strategy with the two-phase intergrowth structure can effectively stabilize the layered structure, suppress the slipping of transition metal layers, and improve electrochemical performance, which provides a new approach for designing high-performance and practical layered transition metal oxide cathode materials for advanced SIBs.
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article