High entropy spinel oxides (CrFeMnNiCox)3O4 (x = 2, 3, 4) nanoparticles as anode material towards electrochemical properties

The newly discovered inorganic material termed high-entropy oxides (HEOs) nanoparticles are made up of diverse metal elements and possesses a single-phase structure. HEOs nanoparticles exhibit numerous advanta-geous features, including high specific capacity, exceptional cycling performance, remarkable structural stability, and super electronic conductivity. Consequently, HEOs nanoparticles have garnered attention for their potential as electrode materials for lithium-ion batteries (LIBs). It is essential to develop HEOs utilizing a range of component-metal elements and thoroughly explore their properties. Transition metal oxides that contain Co have exhibited exceptional electrochemical performance. However, high entropy oxides nanoparticles have the po-tential to exceed the electrochemical performance of other materials by combining different components. Therefore, to leverage the cocktail effect of high entropy materials, we increased the Co content in high entropy oxides and synthesized three sets of high entropy spinel oxides (CrFeMnNiCox)3O4 (x = 2, 3, 4) nanoparticles using the solution combustion method. The results show that the three obtained samples have uniform particle size distribution. The reversible capacities at 200 mA & BULL;g � 1 for (CrFeMnNiCo2)3O4, (CrFeMnNiCo3)3O4 and (CrFeMnNiCo4)3O4 anodes are 467.8 mAh & BULL;g � 1, 574.1 mAh & BULL;g � 1 and 506.2 mAh & BULL;g � 1, respectively. With an in-crease in the current density, the three sets of samples show gradual changes in their capacities. The high entropy oxides (HEOs) nanoparticles exhibit exceptional cycle stability and rate capability when used as the anode of LIBs. This study proposes a novel approach to create high-entropy energy storage materials, opening up possi-bilities for future material design.

Automated summary

The newly discovered inorganic material, high-entropy oxides (HEOs) nanoparticles, is composed of diverse metal elements and has a single-phase structure. HEOs nanoparticles exhibit various advantageous features such as high specific capacity, exceptional cycling performance, remarkable structural stability, and super electronic conductivity. These properties make them potential electrode materials for lithium-ion batteries (LIBs) and therefore, it is important to develop HEOs utilizing different component-metal elements and thoroughly explore their properties.