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High rate lithium ion cycling in electrodeposited binder-free thin film vanadium oxide cathodes with lithium metal anodes in ionic liquid and polymer gel analogue electrolytes
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Accepted Version
Date
2020-11-05
Authors
McGrath, Louise M.
Rohan, James F.
Journal Title
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Publisher
John Wiley & Sons, Inc.
Published Version
Abstract
High rate and long cycle life performance for electrodeposited, binder‐free V 2 O 5 thin film cathodes and lithium metal anodes is described using liquid and polymer gel electrolytes of the pyrrolidinium based (C 4 mpyrTFSI) ionic liquid (IL). Sharp well‐defined voltammetric peaks typically seen with nanostructured V 2 O 5 materials in organic electrolytes, support the fast kinetics observed. The addition of vinylene carbonate (VC) stabilises the electrolyte interface leading to higher electrode capacities than for the additive‐free electrolyte, ~ 120 versus ~90 mAh g ‐1 at 0.75 C. Polymer gel electrolytes based on the IL yield similar electrode capacities, coulombic efficiencies and high rate performances without the VC‐additive. The polymer gel option delivers the better long‐term stability up to 400 cycles with lithium metal anodes with minimal capacity fade at elevated charge and discharge rates up to 5 C.
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Keywords
Electrodeposition , Ionic liquid , Polymer gel electrolyte , Vanadium oxide , Lithium metal
Citation
McGrath, L. M. and Rohan, J. F. (2020) 'High rate lithium ion cycling in electrodeposited binder-free thin film vanadium oxide cathodes with lithium metal anodes in ionic liquid and polymer gel analogue electrolytes', Batteries & Supercaps. doi: 10.1002/batt.202000236
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Copyright
© 2020, WILEY‐VCH Verlag GmbH & Co. This is the peer reviewed version of the following article: McGrath, L. M. and Rohan, J. (2020) 'High rate lithium ion cycling in electrodeposited binder-free thin film vanadium oxide cathodes with lithium metal anodes in ionic liquid and polymer gel analogue electrolytes', Batteries & Supercaps, doi: 10.1002/batt.202000236, which has been published in final form at https://doi.org/10.1002/batt.202000236. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.