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Title: | Reduced Na2+xTi4O9/C Composite: A Durable Anode for Sodium-Ion Batteries | Authors: | DE SLOOVERE, Dries SAFARI, Momo ELEN, Ken D'HAEN, Jan Drozhzhin, Oleg Abakumov, Artem Šimenas, Mantas Banys, Juras Bekaert, Jonas Partoens, Bart VAN BAEL, Marlies HARDY, An |
Issue Date: | 2018 | Source: | CHEMISTRY OF MATERIALS, 30(23), p. 8521-8527 | 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. | Notes: | The authors acknowledge Pieter Samyn for Raman spectroscopy, Fulya Ulu Okudur for preliminary TEM, Bart Ruttens for XRD, Hilde Pellaers for SEM, Tom Haeldermans for elemental analysis, and Karen Leyssen and Vera Meynen for physisorption measurements | Document URI: | http://hdl.handle.net/1942/28312 | ISSN: | 0897-4756 | e-ISSN: | 1520-5002 | DOI: | 10.1021/acs.chemmater.8b03301 | ISI #: | 000453489300014 | Rights: | 2018 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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acs.chemmater.8b03301.pdf Restricted Access | Published version | 2.91 MB | Adobe PDF | View/Open Request a copy |
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