Evaluation of Entropy‐Stabilized (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O Oxides Produced via Solvothermal Method or Electrospinning as Anodes in Lithium‐Ion Batteries

Abstract Entropy‐stabilized oxides (ESOs), such as (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O, have recently gained significant interest as novel anodes for lithium‐ion batteries (LIBs) due to their stable crystal structure and robust lithium‐storage properties. In this work, (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O oxides with different morphologies are prepared by electrospinning and solvothermal method and are applied as anode active materials for LIBs. It is found that different morphologies possess different characteristics, namely particle size, particle size range, and defect density, which have a significant effect on the electrochemical behavior. The most active (Mg, Co, Ni, Cu, Zn) ESO shows outstanding electrochemical properties in terms of high reversible capacity (480 mAh g –1 at 20 mA g –1 ), superior rate capability (206 mAh g –1 at 2 A g –1 ), and excellent cycling stability (390 mAh g –1 at 500 mA g –1 after 300 cycles). The strategy demonstrates the importance of engineering microstructures in tailoring the electrochemical performance.