Two-Dimensional Vanadium Carbide (MXene) as Positive Electrode for Sodium-Ion Capacitors

Yohan Dall'Agnese, Pierre-Louis Taberna, Yury Gogotsi, Patrice Simon

Research output: Contribution to journalArticlepeer-review

266 Scopus citations

Abstract

Ion capacitors store energy through intercalation of cations into an electrode at a faster rate than in batteries and within a larger potential window. These devices reach a higher energy density compared to electrochemical double layer capacitor. Li-ion capacitors are already produced commercially, but the development of Na-ion capacitors is hindered by lack of materials that would allow fast intercalation of Na-ions. Here we investigated the electrochemical behavior of 2D vanadium carbide, V2C, from the MXene family. We investigated the mechanism of Na intercalation by XRD and achieved capacitance of ∼100 F/g at 0.2 mV/s. We assembled a full cell with hard carbon as negative electrode, a known anode material for Na ion batteries, and achieved capacity of 50 mAh/g with a maximum cell voltage of 3.5 V.
Original languageEnglish (US)
Pages (from-to)2305-2309
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume6
Issue number12
DOIs
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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