Science 27 September 2013: Vol. 341 no. 6153 pp. 1502-1505. DOI: 10.1126/science.1241488

Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide

Maria R. Lukatskaya¹,², Olha Mashtalir¹,²,*, Chang E. Ren¹,²,*, Yohan Dall’Agnese¹,²,³,⁴, Patrick Rozier³, Pierre Louis Taberna³, Michael Naguib¹,², Patrice Simon³,⁴, Michel W. Barsoum¹, Yury Gogotsi¹,²

¹Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA.

²A. J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USA.

³Université Paul Sabatier, CIRIMAT UMR CNRS 5085, 118 route de Narbonne, 31062 Toulouse, France.

⁴Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, France.

Abstract

Many batteries and capacitors make use of lithium intercalation as a means of storing and transporting charge. Lithium is commonly used because it offers the best energy density, but also because there are difficulties in storing larger cations without disrupting the crystal structure of the host. Lukatskaya et al. developed a series of MX compounds, where M represents a transition metal and X is carbon or nitrogen.The compound Ti₃C₂ forms a two dimensional layered structure, which is capable of accommodating a wide range of cations, including multivalent ones, either spontaneously or electrochemically.

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