Nanoengineering of thin film V2O5 cathode interfaces via atomic layer deposition for use with polymer gel ionic liquid electrolytes

O'Donoghue, Aaron; Shine, Micheál; Povey, Ian M.; Rohan, James F.

Nanoengineering of thin film V2O5 cathode interfaces via atomic layer deposition for use with polymer gel ionic liquid electrolytes

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2024O'DonoghueNanoengineering.pdf(805.96 KB)

Published version

Date

2024-10-31

Authors

O'Donoghue, Aaron

Shine, Micheál

Povey, Ian M.

Rohan, James F.

Publisher

Wiley

Published Version

https://doi.org/10.1002/batt.202300447

Abstract

In this work we show high capacity and cycle-life performance, for electrodeposited, crystalline V2O5 thin film cathodes protected by a 1 nm ALD alumina deposit for use with Li-metal and ionic liquid electrolyte based microbatteries. Al2O3 coatings thicker than 1 nm are shown to decrease the performance of the V2O5 thin film cathodes. The ionic liquid outperforms an organic electrolyte at 1 C rates with an initial capacity of 148 mAh g−1 and capacity retention of 97 % at cycle 50. A polymer gel analogue of the ionic liquid electrolyte in combination with the 1 nm Al2O3 coated V2O5 had an initial capacity of 139 mAh/g with a capacity retention of 93.5 % to cycle 800, illustrating high capacity and extended cycle life.

Keywords

Lithium-based batteries , Thin-films , Internet of Things , V2O5 thin film , Atomic layer deposition

Citation

O’Donoghue, A., Shine, M., Povey, I.M. and Rohan, J.F. (2024) ‘Nanoengineering of thin film v 2 o 5 cathode interfaces via atomic layer deposition for use with polymer gel ionic liquid electrolytes’, Batteries & Supercaps, 7(1), e202300447. Available at: https://doi.org/10.1002/batt.202300447.