Abstract
A class of high-entropy perovskite oxide (HEPO) [(Bi,Na)1/5(La,Li)1/5(Ce,K)1/5Ca1/5Sr1/5]TiO3 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.
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