Rescaling of metal oxide nanocrystals for energy storage having high capacitance and energy density with robust cycle life

Title
Rescaling of metal oxide nanocrystals for energy storage having high capacitance and energy density with robust cycle life
Authors
이동기정형모최경민Tao ChengRenjia Zhou옥일우Delia J. MillironWilliam A. Goddard III강정구
Issue Date
2015-06
Publisher
Proceedings of the National Academy of Sciences of the United States of America
Citation
VOL 112, NO 26-7919
Abstract
Nanocrystals are promising structures, but they are too large for achieving maximum energy storage performance. We show that rescaling 3-nm particles through lithiation followed by delithiation leads to high-performance energy storage by realizing high capacitance close to the theoretical capacitance available via ion-to-atom redox reactions. Reactive force-field (ReaxFF) molecular dynamics simulations support the conclusion that Li atoms react with nickel oxide nanocrystals (NiO-n) to form lithiated core-shell structures (Ni:Li2O), whereas subsequent delithiation causes Ni:Li2O to form atomic clusters of NiO-a. This is consistent with in situ X-ray photoelectron and optical spectroscopy results showing that Ni2+ of the nanocrystal changes during lithiation-delithiation through Ni-0 and back to Ni2+. These processes are also demonstrated to provide a generic route to rescale another metal oxide. Furthermore, assembling NiO-a into the positive electrode of an asymmetric device enables extraction of full capacitance for a counter negative electrode, giving high energy density in addition to robust capacitance retention over 100,000 cycles.
URI
http://pubs.kist.re.kr/handle/201004/72561
ISSN
0027-8424
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KIST Publication > Article
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