Reduced Na2+ xTi4O9/C Composite: A Durable Anode for Sodium-Ion Batteries

Dries De Sloovere, Mohammadhosein Safari, Ken Elen, Jan D'Haen, Oleg A. Drozhzhin, Artem M. Abakumov, Mantas Šimenas, Juras Banys, Jonas Bekaert, Bart Partoens, Marlies K. Van Bael, An Hardy

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Sodium-ion batteries (SIBs) are potential cost-effective solutions for stationary energy storage applications. Unavailability of suitable anode materials, however, is one of the important barriers to the maturity of SIBs. Here, we report a Na2+xTi4O9/C composite as a promising anode candidate for SIBs with high capacity and cycling stability. This anode is characterized by a capacity of 124 mAh g-1 (plus 11 mAh g-1 contributed by carbon black), an average discharge potential of 0.9 V vs Na/Na+, a good rate capability and a high stability (89% capacity retention after 250 cycles at a rate of 1 C). The mechanisms of sodium insertion/deinsertion and of the formation of Na2+xTi4O9/C are investigated with the aid of various ex/in situ characterization techniques. The in situ formed carbon is necessary for the formation of the reduced sodium titanate. This synthesis method may enable the convenient synthesis of other composites of crystalline phases with amorphous carbon.

Original languageEnglish
Pages (from-to)8521-8527
Number of pages7
JournalChemistry of Materials
Volume30
Issue number23
DOIs
Publication statusPublished - 11 Dec 2018

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