Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 1, Pages 264-269Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912171
Keywords
cathode materials; high-entropy composition; O3-type structure; P3-type structure; sodium-ion batteries
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Funding
- National Key Technologies R&D Program of China [2016YFB0901500]
- National Natural Science Foundation (NSFC) of China [51725206, 51421002]
- NSFC-UKRI-EPSRC [51861165201]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070500]
- Beijing Municipal Science and Technology Commission [Z181100004718008]
- Beijing Natural Science Fund-Haidian Original Innovation Joint Fund [L182056]
- China Scholarship Council (CSC)
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Material innovation on high-performance Na-ion cathodes and the corresponding understanding of structural chemistry still remain a challenge. Herein, we report a new concept of high-entropy strategy to design layered oxide cathodes for Na-ion batteries. An example of layered O3-type NaNi0.12Cu0.12Mg0.12Fe0.15Co0.15Mn0.1Ti0.1Sn0.1Sb0.04O2 has been demonstrated, which exhibits the longer cycling stability (ca. 83 % of capacity retention after 500 cycles) and the outstanding rate capability (ca. 80 % of capacity retention at the rate of 5.0 C). A highly reversible phase-transition behavior between O3 and P3 structures occurs during the charge-discharge process, and importantly, this behavior is delayed with more than 60 % of the total capacity being stored in O3-type region. Possible mechanism can be attributed to the multiple transition-metal components in this high-entropy material which can accommodate the changes of local interactions during Na+ (de)intercalation. This strategy opens new insights into the development of advanced cathode materials.
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