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Titel: Atomic Layer-Deposited Molybdenum Oxide/Carbon Nanotube Hybrid Electrodes: The Influence of Crystal Structure on Lithium-Ion Capacitor Performance
VerfasserIn: Fleischmann, Simon
Zeiger, Marco
Quade, Antje
Kruth, Angela
Presser, Volker
Sprache: Englisch
Titel: ACS applied materials & interfaces
Bandnummer: 10
Heft: 22
Startseite: 18675
Endseite: 18684
Verlag/Plattform: ACS
Erscheinungsjahr: 2018
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Merging of supercapacitors and batteries promises the creation of electrochemical energy storage devices that combine high specific energy, power, and cycling stability. For that purpose, lithium-ion capacitors (LICs) that store energy by lithiation reactions at the negative electrode and double-layer formation at the positive electrode are currently investigated. In this study, we explore the suitability of molybdenum oxide as a negative electrode material in LICs for the first time. Molybdenum oxide-carbon nanotube hybrid materials were synthesized via atomic layer deposition, and different crystal structures and morphologies were obtained by post-deposition annealing. These model materials are first structurally characterized and electrochemically evaluated in half-cells. Benchmarking in LIC full-cells revealed the influences of crystal structure, half-cell capacity, and rate handling on the actual device level performance metrics. The energy efficiency, specific energy, and power are mainly influenced by the overpotential and kinetics of the lithiation reaction during charging. Optimized LIC cells show a maximum specific energy of about 70 W·h·kg-1 and a high specific power of 4 kW·kg-1 at 34 W·h·kg-1. The longevity of the LIC cells is drastically increased without significantly reducing the energy by preventing a deep cell discharge, hindering the negative electrode from crossing its anodic potential limit.
DOI der Erstveröffentlichung: 10.1021/acsami.8b03233
URL der Erstveröffentlichung: https://pubs.acs.org/doi/10.1021/acsami.8b03233
Link zu diesem Datensatz: hdl:20.500.11880/28030
http://dx.doi.org/10.22028/D291-29132
ISSN: 1944-8252
1944-8244
Datum des Eintrags: 8-Okt-2019
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Prof. Dr. Volker Presser
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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