Ion-Exchange Mechanism of Layered Transition-Metal Oxides : Case Study of LiNi0.5Mn0.5O2

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Hyeokjo Gwon
  • Sung-Wook Kim
  • Young-Uk Park
  • Jihyun Hong
  • Gerbrand Ceder
  • Kisuk Kang

Detail(s)

Original languageEnglish
Pages (from-to)8083-8087
Journal / PublicationInorganic Chemistry
Volume53
Issue number15
Online published17 Jul 2014
Publication statusPublished - 4 Aug 2014
Externally publishedYes

Abstract

An ion-exchange process can be an effective route to synthesize new quasi-equilibrium phases with a desired crystal structure. Important layered-type battery materials, such as LiMnO2 and LiNi0.5Mn0.5O2, can be obtained through this method from a sodium-containing parent structure, and they often show electrochemical properties remarkably distinct from those of their solid-state synthesized equivalents. However, while ion exchange is generally believed to occur via a simple topotactic reaction, the detailed phase transformation mechanism during the process is not yet fully understood. For the case of layered LiNi0.5Mn0.5O2, we show through ex situ X-ray diffraction (XRD) that the ion-exchange process consists of several sequential phase transformations. By a study of the intermediate phase, it is shown that the residual sodium ions in the final structure may greatly affect the electrochemical (de)lithiation mechanism.

Citation Format(s)

Ion-Exchange Mechanism of Layered Transition-Metal Oxides: Case Study of LiNi0.5Mn0.5O2. / Gwon, Hyeokjo; Kim, Sung-Wook; Park, Young-Uk et al.
In: Inorganic Chemistry, Vol. 53, No. 15, 04.08.2014, p. 8083-8087.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review