Hybrid device employing three-dimensional arrays of MnO in carbon nanosheets bridges battery-supercapacitor divide

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DOIResolve DOI: http://doi.org/10.1021/nl500011d
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TypeArticle
Journal titleNano Letters
ISSN1530-6992
Volume14
Issue4
Pages19871994; # of pages: 8
SubjectAnodes; Energy storage; Graphene; Lithium; Manganese oxide; Nanosheets; Secondary batteries; Three dimensional; 3D arrays; Capacity retention; Carbon nanosheets; Diffusion distance; Hybrid devices; Intercalation reaction; Li-ion capacitors; MnO; Capacitors
AbstractIt is a challenge to meld the energy of secondary batteries with the power of supercapacitors. Herein, we created electrodes finely tuned for this purpose, consisting of a monolayer of MnO nanocrystallites mechanically anchored by pore-surface terminations of 3D arrays of graphene-like carbon nanosheets ("3D-MnO/CNS"). The biomass-derived carbon nanosheets should offer a synthesis cost advantage over comparably performing designer nanocarbons, such as graphene or carbon nanotubes. High Li storage capacity is achieved by bulk conversion and intercalation reactions, while high rates are maintained through stable ∼20 nm scale diffusion distances. For example, 1332 mAh g -1 is reached at 0.1 A g-1, 567 mAh g-1 at 5 A g-1, and 285 mAh g-1 at 20 A g-1 with negligible degradation at 500 cycles. We employed 3D-MnO/CNS (anode) and carbon nanosheets (cathode) to create a hybrid capacitor displaying among the most promising performances reported: based on the active materials, it delivers 184 Wh kg-1 at 83 W kg-1 and 90 Wh kg-1 at 15-000 W kg-1 with 76% capacity retention after 5000 cycles. © 2014 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21272239
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Record identifierbda37358-1b1a-4a7b-93b9-f0bec5d4fac6
Record created2014-07-23
Record modified2016-05-09
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