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R-Nb2O5 has an ‘idealized’ V2O5 structure and Wadsley–Roth-like structural stability during Li-ion battery cycling

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d2ta08653k· OSTI ID:2423256

The adoption of batteries across diverse applications requires electrode materials with a wider range of performance metrics, such as cost, safety, and material availability. Along the path to discovering new commercially viable materials, a fundamental understanding of chemical and atomic structure features that provide structural stability and effective ion transport is essential. In support of new understanding, we report the cycling behavior of metastable R-Nb2O5. R-Nb2O5 adopts an ‘idealized’ V2O5 structure, in which [NbO6] octahedra alternate in edge- and corner-sharing resulting in ReO3-like slabs, whereas Wadsley–Roth materials have ReO3-like blocks, linked through edge-sharing octahedra at intersecting crystallographic shear planes. We find that this slab structure is stable during cycling, with minor atomic structure changes and cycling curves that are symmetric on discharge and charge, resembling the behavior of Wadsley–Roth materials more than other related materials, such as ReO3, V2O5, or Nb3O7F. Based on our findings, R-Nb2O5 can serve as a ‘structural bridge’ between Wadsley–Roth block structures and V2O5, through which we can relate inter- and intra-polyhedral structures to cycling behavior and structural stability during cycling.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2423256
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 11 Vol. 11; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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