Defects, dopants and Li-ion diffusion in Li2SiO3

N. Kuganathan, L.H. Tsoukalas, A. Chroneos

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Abstract

Lithium metasilicate, Li2SiO3, attracts considerable interest for the development of solid breeding blanket material in fusion reactors and solid electrolyte material in lithium ion batteries. Atomistic simulations are employed to study defect processes, dopant behaviour and lithium ion migration in Li2SiO3. The vacancy assisted long range Li is along the bc plane with the lower activation energy of 0.21 eV suggesting that high ionic conductivity would be observed in this material. The most thermodynamically favourable intrinsic defect type is Li Frenkel (1.66 eV/defect) suggesting that this defect process will ensure the formation of Li vacancies required for Li ion diffusion. Subvalent doping by Al3+ on Si site can increase the Li content in Li2SiO3, however, experimental verification is required. The favourable isovalent dopant on the Si site is calculated to be Ge4+.
Original languageEnglish
Pages (from-to)61-66
Number of pages6
JournalSolid State Ionics
Volume335
Early online date1 Mar 2019
DOIs
Publication statusPublished - 1 Jul 2019

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Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Solid State Ionics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solid State Ionics, [335], (2019) DOI: 10.1016/j.ssi.2019.02.019

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/10.1016/j.ssi.2019.02.019

Keywords

  • LiSiO
  • Defects
  • Li diffusion
  • Dopants

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