High-entropy chemistry enhanced pyrochlore (Y_0.2La_0.2Ce_0.2Nd_0.2Ca_0.2)₂Sn₂O₇ for high-performance lithium-ion battery anode

High-Entropy Oxides (HEOs) are emerging as promising anode materials for lithium-ion batteries (LIBs) due to their stable crystal structure and high theoretical capacity. However, the limited understanding of their intrinsic crystal structure and lithium storage mechanism has hindered their further development and application. In this study, (Y_0.2La_0.2Ce_0.2Nd_0.2Ca_0.2)₂Sn₂O₇ (M₂Sn₂O₇) nanoparticles are successfully synthesized using a hydrothermal method and then applied as an advanced anode material for LIBs. The oxygen vacancies induced by high-entropy chemistry result in the M₂Sn₂O₇ HEO exhibiting excellent cycle stability, achieving high reversible capacities of 574.2 and 430.4 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹ for half and full-cell lithium-ion batteries, respectively. This research highlights the potential of HEOs with stable structures and excellent performance as promising candidates for LIB anode materials.