High-energy X-ray powder diffraction and atomic-pair distribution-function studies of charged/discharged structures in carbon-hybridized Li 2MnSiO4 nanoparticles as a cathode material for lithium-ion batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Maki Moriya
  • Masahiko Miyahara
  • Mana Hokazono
  • Hirokazu Sasaki
  • Atsushi Nemoto
  • Shingo Katayama
  • Yuji Akimoto
  • Shin-Ichi Hirano

Detail(s)

Original languageEnglish
Pages (from-to)7-12
Journal / PublicationJournal of Power Sources
Volume263
Publication statusPublished - 1 Oct 2014
Externally publishedYes

Abstract

The stable cycling performance with a high discharge capacity of ∼190 mAh g-1 in a carbon-hybridized Li2MnSiO4 nanostructured powder has prompted an experimental investigation of the charged/discharged structures using synchrotron-based and laboratory-based X-rays and atomic-pair distribution-function (PDF) analyses. A novel method of in-situ spray pyrolysis of a precursor solution with glucose as a carbon source enabled the successful synthesis of the carbon-hybridized Li 2MnSiO4 nanoparticles. The XRD patters of the discharged (lithiated) samples exhibit a long-range ordered structure characteristic of the (β) Li2MnSiO4 crystalline phase (space group Pmn21) which dissipates in the charged (delithiated) samples. However, upon discharging the long-range ordered structure recovers in each cycle. The disordered structure, according to the PDF analysis, is mainly due to local distortions of the MnO4 tetrahedra which show a mean Mn-O nearest neighbor distance shorter than that of the long-range ordered phase. These results corroborate the notion of the smaller Mn3+/Mn 4+ ionic radii in the Li extracted phase versus the larger Mn 2+ ionic radius in Li inserted phase. Thus Li extraction/insertion drives the fluctuation between the disordered and the long-range ordered structures. © 2014 Elsevier B.V. All rights reserved.

Research Area(s)

  • Atomic pair distribution function, Cathode materials, High-energy X-ray powder diffraction, Lithium ion battery

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

High-energy X-ray powder diffraction and atomic-pair distribution-function studies of charged/discharged structures in carbon-hybridized Li 2MnSiO4 nanoparticles as a cathode material for lithium-ion batteries. / Moriya, Maki; Miyahara, Masahiko; Hokazono, Mana; Sasaki, Hirokazu; Nemoto, Atsushi; Katayama, Shingo; Akimoto, Yuji; Hirano, Shin-Ichi; Ren, Yang.

In: Journal of Power Sources, Vol. 263, 01.10.2014, p. 7-12.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review