Journal of Power Sources Advances (Jan 2024)

MgO coated P2-Na0.67Mn0.75Ni0.25O2 layered oxide cathode for Na-Ion batteries

  • Cornelius Gauckler,
  • Gints Kucinskis,
  • Lukas Fridolin Pfeiffer,
  • Abdelaziz A. Abdellatif,
  • Yushu Tang,
  • Christian Kübel,
  • Fabio Maroni,
  • Ruihao Gong,
  • Margret Wohlfahrt-Mehrens,
  • Peter Axmann,
  • Mario Marinaro

Journal volume & issue
Vol. 25
p. 100135

Abstract

Read online

In this study, we propose an effective strategy to improve the electrochemical performance of a P2-Na0.67Mn0.75Ni0.25O2 (P2-MNO) cathode material for Na-ion batteries based on MgO surface coating. The MgO coating, with a thickness of ∼20–50 nm, is obtained by means of a facile wet-chemistry approach followed by heat treatment carried out at comparatively low temperatures (400–500 °C) in order to avoid possible Mg doping in the bulk of the P2-MNO. Detailed electrochemical investigations demonstrate improved electrochemical performance of the MgO-coated material (M-P2-MNO) in comparison to pristine bare one at both room and elevated (40 °C) temperatures. Operando differential electrochemical mass spectroscopy (DEMS) demonstrate that the MgO coating is effective in suppressing unwanted gas evolution due to side reactions thus stabilizing the cathode/electrolyte interface.

Keywords