Journal article
Cathodic ALD V2O5 thin films for high-rate electrochemical energy storage
RSC advances, v 3(13), pp 4294-4302
01 Jan 2013
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Atomic layer deposition (ALD) is attractive for next-generation electrical energy storage in forming passivation layers and more recently active storage material. Here we report a detailed study of ALD V2O5 as a high capacity cathode material, using vanadium tri-isopropoxide (VTOP) precursor with both O-3 and H2O as oxidant. The O-3-based process produces polycrystalline films with generally higher storage capacity than the amorphous films resulting from the H2O-based process over extended cycling (100 cycles). High capacities are achieved in V2O5 because of the ability to incorporate up to three Li per V2O5 formula unit. To address the central need for both high power and high energy, we identified the crucial tradeoff between higher gravimetric capacity with thinner films and higher material mass with thicker films. For the thickness regime 10-120 nm, we chose areal energy and power density as a useful metric for this tradeoff and found that it is optimized at 60 nm for the O-3-VTOP ALD V2O5 films. We believe the control of material quality, thickness, and conformality achievable with ALD processes is valuable as new nanoarchitectures for electrochemical energy storage come into sight.
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Details
- Title
- Cathodic ALD V2O5 thin films for high-rate electrochemical energy storage
- Creators
- Xinyi Chen - Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USAEkaterina Pomerantseva - Univ Maryland, Syst Res Inst, College Pk, MD 20742 USAKeith Gregorczyk - Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USAReza Ghodssi - Univ Maryland, Syst Res Inst, College Pk, MD 20742 USAGary Rubloff - Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USAEnergy Frontier Research Centers (EFRC)
- Publication Details
- RSC advances, v 3(13), pp 4294-4302
- Publisher
- Royal Soc Chemistry
- Number of pages
- 9
- Grant note
- DESC0001160 / U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE) L-3 Communications fellowship Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center Maryland NanoCenter
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000315818200028
- Scopus ID
- 2-s2.0-84874900236
- Other Identifier
- 991020786011904721
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- Web of Science research areas
- Chemistry, Multidisciplinary