4.8 Article

Deciphering an Abnormal Layered-Tunnel Heterostructure Induced by Chemical Substitution for the Sodium Oxide Cathode

期刊

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 4, 页码 1491-1495

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912101

关键词

electrochemistry; layered-tunnel heterostructure; oxide cathodes; sodium-ion batteries; structural evolution

资金

  1. National Natural Science Foundation of China [21878195, 21805198, 21805018]
  2. National Key R&D Program of China [2017YFB0307504]
  3. Outstanding Youth Science Foundation of Sichuan University [2017SCU04A08]
  4. Library of Innovation Spark Project of Sichuan University [2018SCUH0094]
  5. College-Enterprise Coorperation Project of Sichuan University [19H0628, 18H0357]

向作者/读者索取更多资源

Demands for large-scale energy storage systems have driven the development of layered transition-metal oxide cathodes for room-temperature rechargeable sodium ion batteries (SIBs). Now, an abnormal layered-tunnel heterostructure Na0.44Co0.1Mn0.9O2 cathode material induced by chemical element substitution is reported. By virtue of beneficial synergistic effects, this layered-tunnel electrode shows outstanding electrochemical performance in sodium half-cell system and excellent compatibility with hard carbon anode in sodium full-cell system. The underlying formation process, charge compensation mechanism, phase transition, and sodium-ion storage electrochemistry are clearly articulated and confirmed through combined analyses of in situ high-energy X-ray diffraction and ex situ X-ray absorption spectroscopy as well as operando X-ray diffraction. This crystal structure engineering regulation strategy offers a future outlook into advanced cathode materials for SIBs.

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