A high-entropy perovskite titanate lithium-ion battery anode

A class of high-entropy perovskite oxide (HEPO) [(Bi,Na) 1/5 (La,Li) 1/5 (Ce,K) 1/5 Ca 1/5 Sr 1/5 ]TiO 3 has been synthesized by conventional solid-state method and explored as anode material for lithium-ion batteries. The half-battery provides a high initial discharge capacity of about 125.9 mAh g −1 and exhibits excellent cycle stability. An outstanding reversible capacity of 120.4 mAh g −1 and superior delivering retention of ~ 100% can be obtained at 1000 mA g −1 after 300 cycles. Even at a high current density of 3000 mA g −1 , a reversible capacity of 70 mAh g −1 can be retained, indicating excellent rate performance. Such outstanding cycle and rate performance can be ascribed to the entropy-stabilized structure offered by mixed aliovalent cations and the charge compensation mechanism in HEPO, respectively. This work highlights the great potential of perovskite high-entropy oxides as anode materials for lithium-ion batteries.