Journal article
Annealing-Assisted Enhancement of Electrochemical Stability of Na-Preintercalated Bilayered Vanadium Oxide Electrodes in Na-Ion Batteries
ACS applied energy materials, v 3(1), pp 1063-1075
01 Jan 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Layered transition metal compounds with expanded interlayer regions, stabilized by structural water, often show high initial capacities but suffer from rapid capacity decay and poor rate capability in Na-ion batteries. High-temperature annealing, accompanied by phase transformation with the formation of more dense atomic structures, has been shown to improve electrochemical stability. However, the capacity of annealed materials decreases compared to their original forms. Here, we for the first time demonstrate that low-temperature annealing (260 degrees C under vacuum) can be used to achieve enhanced electrochemical stability of high capacity Na-preintercalated bilayered vanadium oxide (delta-NaxV2O5 center dot nH(2)O) nanobelts, while preserving its open layered structure with expanded interlayer region available for insertion and diffusion of a large number of electrochemically cycled Na+ ions. Intriguingly, we demonstrate that using low-temperature vacuum annealing the interlayer water content can be varied in the 0.5 <= n 15 <= 1.20 range without a significant change in the interlayer spacing. The mechanism of the thermally induced interlayer water loss is discussed. The improved capacity retention exhibited by low-temperature vacuum annealed delta-NaxV2O5 center dot nH(2)O nanobelts is attributed to the partial removal of the structural water from the interlayer region, formation of additional bonds within the V-O bilayers, and increased stacking order of V-O bilayers. Low-temperature vacuum annealing is proposed as an efficient strategy to control interlayer water and advance electrochemical stability of the growing family of hydrated transition metal compounds used as electrodes in intercalation batteries.
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Details
- Title
- Annealing-Assisted Enhancement of Electrochemical Stability of Na-Preintercalated Bilayered Vanadium Oxide Electrodes in Na-Ion Batteries
- Creators
- Mallory Clites - Drexel UniversityJames L. Hart - Drexel UniversityMitra L. Taheri - Drexel UniversityEkaterina Pomerantseva - Drexel University
- Publication Details
- ACS applied energy materials, v 3(1), pp 1063-1075
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 25
- Grant note
- DMR-1429661 / National Science Foundation Major Research Instrumentation award; National Science Foundation (NSF) DMR-1609272 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000510104700115
- Scopus ID
- 2-s2.0-85077454858
- Other Identifier
- 991019168469504721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary