Anode materials based on rock-salt high-entropy oxide for Li-ion storage.

Santangelo S., Triolo C., Xu W., Petrovičovà B., Pinna N.
  Martedì 13/09   09:00 - 13:30   Aula L - Christa Mc Auliffe   VI - Fisica applicata, acceleratori e beni culturali   Presentazione
In the latest years, high-entropy oxides (HEOs), a new class of single-phase solid solution materials with very promising functional properties, have attracted growing interest for their great potential in a broad range of applications. This work demonstrates that pure single-phase $Mg_{0.2}Co_{0.2}Ni_{0.2}Cu_{0.2}Zn_{0.2}O$ HEO with rock-salt structure can be prepared, under milder conditions (shorter heat treatments at lower temperatures) than the standard solid-state techniques, by electrospinning and solvothermal method. The produced HEOs, having different different particle size, particle size range, and defect density, are evaluated as active anode materials in lithium ion batteries. Their microstructure strongly affects the electrochemical behavior. The most active $Mg_{0.2}Co_{0.2}Ni_{0.2}Cu_{0.2}Zn_{0.2}O$ nanofibers exhibit outstanding electrochemical properties in terms of high reversible capacity (480 mAh/g} at 20 mA/g), superior rate capability (206 mAh/g at 2 A/g), and excellent cycling stability (390 mAh/g at 0.5 {A/g after 300 cycles).