Phase transitions in the “spinel-layered” li1+xni0.5mn1.5o4 (x = 0, 0.5, 1) cathodes upon (de)lithiation studied with operando synchrotron x-ray powder diffraction

Oleg A. Drozhzhin, Anastasia M. Alekseeva, Vitalii A. Shevchenko, Dmitry Chernyshov, Artem M. Abakumov, Evgeny V. Antipov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

“Spinel-layered” Li1+xNi0.5Mn1.5O4 (x = 0, 0.5, 1) materials are considered as a cobalt-free alternative to currently used positive electrode (cathode) materials for Li-ion batteries. In this work, their electrochemical properties and corresponding phase transitions were studied by means of synchrotron X-ray powder diffraction (SXPD) in operando regime. Within the potential limit of 2.2–4.9 V vs. Li/Li+ LiNi0.5Mn1.5O4 with cubic spinel type structure demonstrates the capacity of 230 mAh·g−1 associated with three first-order phase transitions with significant total volume change of 8.1%. The Li2Ni0.5Mn1.5O4 material exhibits similar capacity value and subsequence of the phase transitions of the spinel phase, although the fraction of the spinel-type phase in this material does not exceed 30 wt.%. The main component of Li2Ni0.5Mn1.5O4 is Li-rich layered oxide Li(Li0.28Mn0.64Ni0.08)O2, which provides nearly half of the capacity with very small unit cell volume change of 0.7%. Lower mechanical stress associated with Li (de)intercalation provides better cycling stability of the spinel-layered complex materials and makes them more perspective for practical applications compared to the single-phase LiNi0.5Mn1.5O4 high-voltage cathode material.

Original languageEnglish
Article number1368
JournalNanomaterials
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Cathode material
  • High-voltage
  • Li-ion
  • LiNi0.5Mn1.5O4
  • Oxides
  • Spinel
  • Spinel-layered composite

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