NDLI: Vanadia–titania multilayer nanodecoration of carbon onions <i>via</i> atomic layer deposition for high performance electrochemical energy storage

Content Provider	Royal Society of Chemistry (RSC)
Author	Presser, Volker Tolosa, Aura Quade, Antje Grobelsek, Ingrid Peter, Nicolas J. Kruth, Angela Krüner, Benjamin Fleischmann, Simon Zeiger, Marco
Copyright Year	2017
Abstract	Atomic layer deposition has proven to be a particularly attractive approach for decorating mesoporous carbon substrates with redox active metal oxides for electrochemical energy storage. This study, for the first time, capitalizes on the cyclic character of atomic layer deposition to obtain highly conformal and atomically controlled decoration of carbon onions with alternating stacks of vanadia and titania. The addition of 25 mass% TiO2 leads to expansion of the VO2 unit cell, thus greatly enhancing lithium intercalation capacity and kinetics. Electrochemical characterization revealed an ultrahigh discharge capacity of up to 382 mA h g−1 of the composite electrode (554 mA h g−1 per metal oxide) with an impressive capacity retention of 82 mA h g−1 (120 mA h g−1 per metal oxide) at a high discharge rate of 20 A g−1 or 52C. Stability benchmarking showed stability over 3000 cycles when discharging to a reduced potential of −1.8 V vs. carbon. These capacity values are among the highest reported for any metal oxide system, while in addition, supercapacitor-like power performance and longevity are achieved. At a device level, high specific energy and power of up to 110 W h kg−1 and 6 kW kg−1, respectively, were achieved when employing the hybrid material as anode versus activated carbon cathode.
Starting Page	2792
Ending Page	2801
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta09890h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Atomic layer deposition Mesoporous material Carbon Redox Electrochemistry Crystal structure Lithium Electrode Specific energy Anode Activated carbon Cathode
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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Vanadia–titania multilayer nanodecoration of carbon onions via atomic layer deposition for high performance electrochemical energy storage

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