High entropy spinel oxide (HESO) nanoparticles were synthesized via a surfactant-assisted hydrothermal method and used as a novel anode material in a lithium-ion battery. The HESO consists of non-equimolar cations of Cr, Mn, Fe, Co, and Ni dispersed in two Wyckoff sites with various valence states. Due to a strong entropy-induced phase stabilization effect of the HESO, no inactive MgO structural pillars, which are exclusively present in the reported rock salt type high entropy oxides, are required to achieve high electrode cycling stability. A superior charge–discharge capacity of 1235 mA h g⁻¹, the highest among all known HEOs, is obtained with 90% capacity retention after 200 cycles. The unique HESO is also characterized by plenty of oxygen vacancies and three-dimensional Li⁺ transport pathways. Also, great high-rate performance, i.e., 500 mA h g⁻¹ @ 2000 mA g⁻¹, of the HESO electrode is demonstrated.

中文翻译：

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高熵尖晶石氧化物纳米粒子具有出色的锂化-脱锂性能

通过表面活性剂辅助水热法合成了高熵的尖晶石氧化物（HESO）纳米颗粒，并将其用作锂离子电池中的新型负极材料。HESO由分散在两个具有不同化合价态的Wyckoff位点的Cr，Mn，Fe，Co和Ni的非等离子阳离子组成。由于HESO具有很强的熵诱导的相稳定作用，因此不需要高惰性的MgO结构柱（仅在已报道的岩盐型高熵氧化物中存在）即可实现较高的电极循环稳定性。在200次循环后，具有9035％的容量保持率，可获得1235 mA hg ^-1的优异充放电容量，是所有已知HEO中最高的。独特的HESO还具有大量的氧空位和三维Li⁺运输途径。此外，还展示了HESO电极的高倍率性能，即500 mA hg ^-1 @ 2000 mA g ^-1。