Amorphization of Pseudocapacitive T−nb₂o₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Author(s)

Wessel van den Bergh
Sean Wechsler, University of South CarolinaFollow
Hasala Nadeesini Lokupitiya
Lauren Jarocha
Kwangnam Kim
James Chapman
Kyoung E. Kweon
Brandon C. Wood
Steve Heald
Morgan Stefik PhD, University of South CarolinaFollow

Document Type

Article

Abstract

Intercalationpseudocapacitancecan combinecapacitor-likepower densitieswith battery-likeenergy densities.Such surface-limitedbehaviorrequiresrapid diffusionwhere amorphizationcan increasesolid-statediffusivity.Here intercalationpseudoca-pacitivematerialswith tailoredextentsof amorphizationin T-Nb2O5are first reported.Amorphizationwas characterizedwithWAXS, XPS, XAFS, and EPR which suggesteda peroxide-rich(O22) surface that was consistentwith DFT predictions.A seriesof tunableisomorphicarchitecturesenabledcomparisonswhileindependentlyvaryingtransportparameters.Throughprocessof elimination,solid-statelithium diffusionwas identifiedas thedominantdiffusive-constraintdictatingthe maximumvoltagesweep rate for surface-limitedkinetics(vSLT), termed the Surface-LimitedThreshold(SLT). ThevSLTincreasedwith amorphizationhoweverstable cycling requiredcrystallineT-Nb2O5. A current-responsemodel using series-impedanceswell-matchedtheseobservations.This perspectiverevealedthat amorphizationof T-Nb2O5enhancedsolid-statediffusionby 12.2% and increasedsurface-limitationsby 17.0% (stablesamples).This approachenabledretaining95% lithiationcapacityat ~800mVs1(1,600C-rate equivalent).

Digital Object Identifier (DOI)

https://doi.org/10.1002/batt.202200056

Publication Info

Published in Batteries & Supercaps, Volume 5, Issue 6, 2022, pages e202200056-.

© 2022 The Authors. Batteries & Supercaps published by Wiley-VCH GmbH

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

APA Citation

van den Bergh, W., Wechsler, S., Lokupitiya, H. N., Jarocha, L., Kim, K., Chapman, J., Kweon, K. E., Wood, B. C., Heald, S., & Stefik, M. (2022). Amorphization of Pseudocapacitive T−nb₂o₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures. Batteries & Supercaps, 5(6). https://doi.org/10.1002/batt.20220005

Rights

© 2022 The Authors. Batteries & Supercaps published by Wiley-VCH GmbH

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.