Researchers synthesized high-entropy spinel oxide nanoparticles (HESOs) with non-equimolar Cr, Mn, Fe, Co, and Ni for use as a lithium-ion battery anode. The HESO exhibited a high reversible capacity (1235 mAh g⁻¹), excellent rate capability (500 mAh g⁻¹ at 2000 mA g⁻¹), and good cycling stability (90% capacity retention after 200 cycles) due to entropy stabilization and the presence of oxygen vacancies.

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This study presents a novel HESO material with excellent electrochemical performance as a LIB anode. The high capacity, good rate capability, and reasonable cycling stability are promising. The entropy-induced phase stabilization is a key advantage. However, the high synthesis temperature, low first-cycle coulombic efficiency, and capacity fluctuations require further attention. The study also lacks a comprehensive investigation of the underlying mechanisms. Overall, the research is strong and contributes significantly to the field, warranting a rating of 4 despite some limitations.