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Übergangsmetallcarbodiimide als molekulare negative Elektroden‐ materialien für Li‐ und Na‐Ionenbatterien mit hervorragendem Zyklisierungsverhalten

Journal Article · · Angewandte Chemie
 [1];  [1];  [2];  [3];  [4];  [5];  [1];  [2];  [1]
  1. Institut Charles Gerhardt de Montpellier, UMR CNRS 5253 34095 Montpellier Frankreich, Réseau sur le Stockage Electrochimique de l'Energie, FR CNRS 3459 80039 Amiens Frankreich
  2. Institut für Anorganische Chemie der RWTH Aachen 52056 Aachen Deutschland
  3. JCNS und PGI, JARA-FIT, Forschungszentrum Jülich GmbH 52425 Jülich Deutschland, LCIS/GREENMAT Institut de Chimie B6 University of Liège 4000 Liège Belgien
  4. JCNS und PGI, JARA-FIT, Forschungszentrum Jülich GmbH 52425 Jülich Deutschland, Materials Science and Technology Division Oak Ridge National, Laboratory 37831 Oak Ridge TN USA
  5. Groupe de Physique des Matériaux UMR CNRS 6634 – Universität Normandie 76801 St Etienne du Rouvray Cedex Frankreich
Abstract

Wir weisen die elektrochemische Aktivität von Übergangsmetallcarbodiimiden gegenüber Lithium und Natrium nach. Insbesondere das Eisencarbodiimid FeNCN läßt sich effektiv als negatives Elektrodenmaterial für Alkalimetallionenbatterien verwenden, ähnlich dem Oxidanalogon FeO. Auf der Basis von 57 Fe‐Mößbauer‐ und infrarotspektroskopischen (IR) Daten kann der elektrochemische Reaktionsmechanismus bei Entladung und Beladung durch die reversible Umwandlung von Fe‐NCN‐ in Li/Na‐NCN‐Bindungen erklärt werden. Diese neuen Elektrodenmaterialien weisen höhere Kapazitäten als die etablierten negativen Referenzelektroden wie Graphit oder Hartkohlenstoff auf. Im Gegensatz zu seinem Oxidanalogon benötigt Eisencarbodiimid keine aufwendige Vorbehandlung (Nanopräparation, spezielle Texturen, Beschichtung usw.), um eine lange Lebensdauer bei Stromdichten bis zu 9 A g −1 für hunderte von Lade‐/Entladezyklen zu erreichen. Ähnlich zur Eisenverbindung können einige andere Übergangsmetallcarbodiimide M x (NCN) y mit M=Mn, Cr, Zn ebenso erfolgreich gegen Lithium und Natrium zyklisieren. Ihre elektrochemische Aktivität und Leistung öffnet den Weg zum Design einer neuartigen Klasse von Anodenmaterialien.

Sponsoring Organization:
USDOE
OSTI ID:
1401656
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 16 Vol. 128; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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