Part I: Electronic and ionic transport properties of the ordered and disordered LiNi0.5Mn1.5O4 spinel cathode

Md. Ruhul Amin, Ilias Belharouk

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Here, we report on the electronic and ionic conductivity and diffusivity of the ordered (P4332) and disordered (Fd3¯m) LiNi0.5Mn1.5O4 spinel material, which have been determined by using ion and electron blocking cell configurations as a function of lithium concentration and temperature. The disordered phase exhibits about fifteen-time higher electronic conductivity than the ordered phase at room temperature in the lithiated state. Upon delithiation, the electronic conductivity of the ordered LiNi0.5Mn1.5O4 phase increases and reaches the same levels observed for the disordered phase. The ionic conductivity and diffusivity of LiNi0.5Mn1.5O4, in the ordered and disordered forms, are in the range of ∼1 × 10−9 S/cm and ∼5 × 10−9 cm2/s, respectively. Both phases exhibit similar activation energies for the ionic conductivity and diffusivity, i.e. 0.70 ± 0.2eV and 0.74 ± 0.2eV, respectively. It can be concluded from the obtained results that the electrochemical performance of LiNi0.5Mn1.5O4, whether ordered or disordered, is limited by lithium transport, but is fast enough to allow charge/discharge of micron-scale particles at practical C-rates.

Original languageEnglish
Pages (from-to)311-317
Number of pages7
JournalJournal of Power Sources
Volume348
DOIs
Publication statusPublished - 30 Apr 2017

    Fingerprint

Keywords

  • Disordered spinel
  • Electronic conductivity
  • Ionic conductivity
  • Ionic diffusivity
  • LiNiMnO
  • Ordered spinel

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this