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Titel: Nanosized titanium niobium oxide/carbon electrodes for lithium-ion energy storage applications
VerfasserIn: Shim, Hwirim
Lim, Eunho
Fleischmann, Simon
Quade, Antje
Tolosa, Aura
Presser, Volker
Sprache: Englisch
Titel: Sustainable energy & fuels : interdisciplinary research for the development of sustainable energy technologies
Bandnummer: 3
Heft: 7
Startseite: 1776
Endseite: 1789
Verlag/Plattform: RSC
Erscheinungsjahr: 2019
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: High demand for safer and more stable lithium-ion batteries brings up the challenge for finding better electrode materials. In this work, we study the functionalities of titanium niobium oxide (TNO)/carbon hybrid materials using carbon onions (OLC) and carbon nanohorns (NS), which are synthesized by well-controlled sol–gel chemistry, for anodes in lithium-ion batteries. We used two different molar ratios of titanium to niobium (1 : 2 and 1 : 5), and we compared the TNO–OLC and TNO–NS hybrid materials to conventional composite electrodes using physically admixed carbon. TNO–OLC-1:2 and TNO–OLC-1:5 nanohybrid materials displayed good electrochemical performance, with initial capacity values of 284 mA h g−1 and 290 mA h g−1, respectively, normalized to the metal oxide mass. Moreover, they maintained 68% (TNO–OLC-1:2) and 69% (TNO–OLC-1:5) of the initial capacity at 1 A g−1, outperforming the carbon nanohorn hybridized and composited electrode which maintained less than 50%. The long-term cycling stability of 800 cycles presents good capacity retention of 73% (TNO–OLC-1:2) and 76% (TNO–OLC-1:5), while the TNO–NS-1:2 hybrid material yields better capacity retention of 90% despite its low capacity. Our study demonstrates that the combination of TNO with appropriate carbon substrates enables good electrochemical performance but requires careful evaluation of the interplay of crystal structure, phase content, and particle morphology.
DOI der Erstveröffentlichung: 10.1039/C9SE00166B
URL der Erstveröffentlichung: https://pubs.rsc.org/en/content/articlelanding/2019/se/c9se00166b#!divAbstract
Link zu diesem Datensatz: hdl:20.500.11880/27733
http://dx.doi.org/10.22028/D291-28781
ISSN: 2398-4902
Datum des Eintrags: 10-Sep-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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