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

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Affiliations

  • 1. School of Chemical Engineering, Sichuan University, Chengdu, 610065, P. R. China.
      Authors
    • Xiao Y 1
    • Zhu YF 1
    • Xiang W 1
    • Wu ZG 1
    • Li YC 1
    • Lai J 1
    • Li S 1
    • Wang E 1
    • Yang ZG 1
    • Xu CL 1
    • Zhong BH 1
    • Guo XD 1
    (12 authors)

ORCIDs linked to this article

Angewandte Chemie (International ed. in English), 05 Dec 2019, 59(4):1491-1495
https://doi.org/10.1002/anie.201912101 PMID: 31677318 

Abstract 

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 Na0.44 Co0.1 Mn0.9 O2 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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Read article at publisher's site: https://doi.org/10.1002/anie.201912101

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Funding 

Funders who supported this work.

College-Enterprise Coorperation Project of Sichuan University (2)

Library of Innovation Spark Project of Sichuan University (1)

National Key R&D Program of China (1)

National Natural Science Foundation of China (3)

Outstanding Youth Science Foundation of Sichuan University (1)