Using High-Entropy Configuration Strategy to Design Na-Ion Layered Oxide Cathodes with Superior Electrochemical Performance and Thermal Stability

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Abstract
Na-ion layered oxide cathodes (NaxTMO2, TM = transition metal ion(s)), as an analogue of lithium layered oxide cathodes (such as LiCoO2, LiNixCoyMn1-x-yO2), have received growing attention with the development of Na-ion batteries. However, due to the larger Na+ radius and stronger Na+-Na+ electrostatic repulsion in NaO2 slabs, some undesired phase transitions are observed in NaxTMO2. Herein, we report a high-entropy configuration strategy for NaxTMO2 cathode materials, in which multicomponent TMO2 slabs with enlarged interlayer spacing help strengthen the whole skeleton structure of layered oxides through mitigating Jahn-Teller distortion, Na+/vacancy ordering, and lattice parameter changes. The strengthened skeleton structure with a modulated particle morphology dramatically improves the Na+ transport kinetics and suppresses intragranular fatigue cracks and TM dissolution, thus leading to highly improved performances. Furthermore, the elaborate high-entropy TMO2 slabs enhance the TM-O bonding energy to restrain oxygen release and thermal runaway, benefiting for the improvement of thermal safety.
Funding Information
  • China Postdoctoral Science Foundation (2021M703460)
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences (2020006)
  • National Natural Science Foundation of China (51725206, 52072403, 52122214)
  • Natural Science Foundation of Beijing Municipality (2212022)
  • Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21070500)

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