Journal article
Bilayered vanadium oxides by chemical pre-intercalation of alkali and alkali-earth ions as battery electrodes
ENERGY STORAGE MATERIALS, v 11, pp 30-37
01 Mar 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We report the use of the chemical pre-intercalation synthesis technique to insert alkali (Li+, Na+, K+) and, for the first time, alkali-earth (Mg2+ and Ca2+) ions into the structure of vanadium oxide leading to the formation of the bilayered delta-MxV2O5 (M = Li, Na, K, Mg, Ca) phase with expanded interlayer spacing, enabling a large number of insertion sites for and faster diffusion of charge-carrying ions. By altering the nature of the chemically preintercalated ion, interlayer spacing of the synthesized d-MxV(2)O(5) materials was varied between 9.62 and 13.40 angstrom. We for the first time show that the interlayer spacing increases with the increase of the hydrated ion radius. The ion (Na+, K+, Mg2+, Ca2+) stabilization effect was investigated in Li-ion cells, with Li-preintercalated phase, delta-LixV2O5, serving as a reference material. Our analyses indicate that cyclability and rate performance of the delta-MxV2O5 improves with increasing interlayer spacing. The highest initial capacity (198 mAh g(-1)), greatest capacity retention (81.8% after 50 cycles at 20 mA g(-1)), and highest capacity retention at higher current rates (74.5% when current rate was changed from C/15 to 1 C) were exhibited by Mg-stabilized delta-V2O5 with the largest interlayer spacing (13.40 angstrom). This research demonstrates the efficacy of a facile chemical pre-intercalation strategy to synthesize ion-stabilized layered electrode materials with improved electrochemical stability. Ion-stabilized layered materials with large interlayer spacing are attractive for applications that involve electrochemically driven movement of ions through two-dimensional diffusion channels, ranging from beyond Li-ion energy storage and electrochromics to actuation and water treatment.
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Details
- Title
- Bilayered vanadium oxides by chemical pre-intercalation of alkali and alkali-earth ions as battery electrodes
- Creators
- Mallory Clites - Drexel UniversityEkaterina Pomerantseva - Drexel University
- Publication Details
- ENERGY STORAGE MATERIALS, v 11, pp 30-37
- Publisher
- Elsevier
- Number of pages
- 8
- Grant note
- 1609272 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000425894300006
- Scopus ID
- 2-s2.0-85029862498
- Other Identifier
- 991019168831004721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology