Reactivity of Sodium Alanates in Lithium Batteries

L. Silvestri, L. Farina, D. Meggiolaro, S. Panero, F. Padella, S. Brutti, P. Reale

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Novel chemistries for secondary batteries are investigated worldwide in order to boost the development of next-generation rechargeable storage systems and especially of lithium-devices. High capacity anode materials for Li-ion cells are at the center stage of R&D in order to improve the performances. In this view, conversion materials are an exciting playground. Among the various proposed class of conversion anodes, metal hydrides are probably the most challenging and promising due to the high theoretical capacities, instability toward the standard carbonate-based electrolytes, large volume variations upon cycling, and moderately low working voltages. Among them lightweight hydrides, like alkaline alanates, are an almost unexplored family of materials. In this study, we present a fundamental study on the electrochemical conversion reaction of sodium alanates: NaAlH4, Na3AlH6, and Na2LiAlH6. Our goal is to improve the understanding of the basic solid-state electrochemistry that drives the conversion reactions of these materials in lithium cells. Samples have been prepared mechanochemically and characterized by X-ray diffraction (XRD), infrared spectroscopy, and transmission electron microscopy. All materials have been assembled in lithium cells with a commercial liquid electrolyte to test their electrochemical activity. The Li incorporation/deincorporation mechanism for all materials has been explored by in situ XRD and interpreted also in view of density functional theory thermodynamic calculations.
Original languageEnglish
Pages (from-to)28766 - 28775
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number52
DOIs
Publication statusPublished - 31 Dec 2015
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Silvestri, L., Farina, L., Meggiolaro, D., Panero, S., Padella, F., Brutti, S., & Reale, P. (2015). Reactivity of Sodium Alanates in Lithium Batteries. Journal of Physical Chemistry C, 119(52), 28766 - 28775. https://doi.org/10.1021/acs.jpcc.5b10297