Kinetically accelerated lithium storage in (LiFeCoNiMnCr) 2 O 3 enabled by hollow multishelled structure, oxygen vacancies and high entropy engineering

High-entropy oxides (HEOs) are attractive for lithium-ion batteries (LIBs) owing to their extensive component scope and regulatable electrochemical performance. However, their own the sluggish kinetics hinder their largescale application. The modification including adjusting the intrinsic activity and structural design is required to compensate for their inherent shortcomings. Here, oxygen vacancies with goal capability are brought in a special hollow multishelled (LiFeCoNiMnCr) 2 O 3 spheres (Li-HEO-HoMS) through an in-situ formed carbonaceous microspheres as templates coupled with the kirkendall effect to expedite the ion/electron transportation and increase structure/electrochemistry stability. Theory combined with experiment reveal the feasible promotion of Li-ions storage, charge transfer, diffusion dynamics and long-term stability from hollow multishelled sphere structure, oxygen vacancies and entropy-stabilizing effect, which conclusively generates reinforced electrochemical performance. Benefit from these synergistic attributes, the Li-HEO-HoMS exhibits outstanding electrochemical property for LIBs with 767.7 mAh g-1 at 1 A g-1 after 500 cycles and still shows a specific capacity of 443.1 mAh g-1 at a high rate of 4 C. The strategy demonstrates the importance of the intrinsic activity and structural design of HEO in tailoring the electrochemical performance.