Binary to quaternary Mo-based phosphate glasses cathodes Li-batteries: Influence of Mo substitution by Fe and Mn

• Published in: Materials letters 2025-03, Vol.382, Article 137879
• Main Authors: Delanoë, Alexis, Agullo, Julia, De Araujo, Maxime, Guyot, Taos, Mucci, Romain, Perret, Damien, Simonin, Loic, Martinet, Sébastien
• Format: Article
• Language: English
• Subjects: Cathode; Design of Experiment; Li-ion batteries; Phosphate glass; Positive electrode
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137879

•Mo-phosphate-based glasses as positive electrode materials for Li-Batteries.•Design of experiments (DOE) approach allowed ternary diagrams performance drawing.•DOE highlights the effects of Mo, Fe and Mn substitution.•High discharge capacities (> 385 mAh/g): far above commercial cathode materials.•Second cycle performance is still limited by large capacity loss (≈50%) To correlate glass chemical compositions with electrochemical performances, seven Mo-phosphate glasses (with/without Fe and/or Mn) were prepared using a Design of Experiment approach and characterized (XRD, EDS, XRF). Evaluated as cathode active materials in Li-metal coin cells, their electrochemical performances were measured by galvanostatic cycling at C/50 rate. The glasses show high first discharge capacities, but energy densities (420 to 705 Wh/kg at the material level) were limited by low voltage. Significant capacities losses (≈50%) occured between the first and second discharges, affecting subsequent performances. Ternary diagrams for first cycles discharge capacities and voltage are presented.