Holey two-dimensional transition metal oxide nanosheets for efficient energy storage

Lele Peng, Pan Xiong, Lu Ma, Yifei Yuan, Yue Zhu, Dahong Chen, Xiangyi Luo, Jun Lu (), Khalil Amine and Guihua Yu ()
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Lele Peng: The University of Texas at Austin
Pan Xiong: The University of Texas at Austin
Lu Ma: Argonne National Laboratory
Yifei Yuan: Argonne National Laboratory
Yue Zhu: The University of Texas at Austin
Dahong Chen: The University of Texas at Austin
Xiangyi Luo: Argonne National Laboratory
Jun Lu: Argonne National Laboratory
Khalil Amine: Argonne National Laboratory
Guihua Yu: The University of Texas at Austin

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Transition metal oxide nanomaterials are promising electrodes for alkali-ion batteries owing to their distinct reaction mechanism, abundant active sites and shortened ion diffusion distance. However, detailed conversion reaction processes in terms of the oxidation state evolution and chemical/mechanical stability of the electrodes are still poorly understood. Herein we explore a general synthetic strategy for versatile synthesis of various holey transition metal oxide nanosheets with adjustable hole sizes that enable greatly enhanced alkali-ion storage properties. We employ in-situ transmission electron microscopy and operando X-ray absorption structures to study the mechanical properties, morphology evolution and oxidation state changes during electrochemical processes. We find that these holey oxide nanosheets exhibit strong mechanical stability inherited from graphene oxide, displaying minimal structural changes during lithiation/delithiation processes. These holey oxide nanosheets represent a promising material platform for in-situ probing the electrochemical processes, and could open up opportunities in many energy storage and conversion systems.

Date: 2017
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DOI: 10.1038/ncomms15139

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