Lattice dynamics, thermodynamics and elastic properties of monoclinic Li 2CO 3 from density functional theory

Shun Li Shang, Louis G. Hector, Siqi Shi, Yue Qi, Yi Wang, Zi Kiu Liu

Research output: Contribution to journalArticle

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Abstract

Monoclinic Li 2CO 3 has been identified as a critical component of the solid electrolyte interphase (SEI), a passivating film that forms on Li-ion battery anode surfaces. Here, lattice dynamics, finite temperature thermodynamics and the elastic properties of monoclinic Li 2CO 3 are examined with density functional theory (DFT) and various exchange-correlation functionals. To account for LO-TO splittings in phonon dispersion relations of Li 2CO 3, which is a polar compound, a mixed-space phonon approach is employed. Bond strengths between atoms are quantitatively explored with phonon force constants. Temperature variations of the entropy, enthalpy, isobaric heat capacity and linear (average) thermal expansion are computed using the quasiharmonic approach. The single-crystal elasticity tensor components along with polycrystalline bulk, shear and Young's moduli are computed with a least-squares approach based upon the stress tensor computed from DFT. Computed thermodynamic properties as well as structural and elastic properties of the monoclinic Li 2CO 3 are in close accord with available theoretical and experimental data. In contrast to a recent DFT study, however, computed vibrational spectra suggest that neither the monoclinic Li 2CO 3 nor its high-temperature hexagonal phase exhibits either elastic or vibrational instabilities.

Original languageEnglish (US)
Pages (from-to)5204-5216
Number of pages13
JournalActa Materialia
Volume60
Issue number13-14
DOIs
StatePublished - Aug 2012
Externally publishedYes

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Lattice vibrations
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Keywords

  • Elasticity
  • First-principles calculations
  • Li CO
  • Phonon
  • Thermodynamics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Lattice dynamics, thermodynamics and elastic properties of monoclinic Li 2CO 3 from density functional theory. / Shang, Shun Li; Hector, Louis G.; Shi, Siqi; Qi, Yue; Wang, Yi; Liu, Zi Kiu.

In: Acta Materialia, Vol. 60, No. 13-14, 08.2012, p. 5204-5216.

Research output: Contribution to journalArticle

Shang, Shun Li; Hector, Louis G.; Shi, Siqi; Qi, Yue; Wang, Yi; Liu, Zi Kiu / Lattice dynamics, thermodynamics and elastic properties of monoclinic Li 2CO 3 from density functional theory.

In: Acta Materialia, Vol. 60, No. 13-14, 08.2012, p. 5204-5216.

Research output: Contribution to journalArticle

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