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