부산대학교 도서관

Vanadium bronzes have been well-demonstrated as promising cathode materials for aqueous zinc-ion batteries. However, conventional single-ion pre-intercalated V2O5nearly reached its energy/power ceiling due to the nature of micro/electronic structures and unfavourable phase transition during Zn2+storage processes. Here, a simple and universal in-situanodic oxidation method of quasi-layered CaV4O9in a tailored electrolyte was developed to introduce dual ions (Ca2+and Zn2+) into bilayer δ-V2O5frameworks forming crystallographic ultra-thin vanadium bronzes, Ca0.12Zn0.12V2O5·nH2O. The materials deliver transcendental maximum energy and power densities of 366 W h kg−1(478 mA h g−1@ 0.2 A g−1) and 6627 W kg−1(245 mA h g−1@ 10 A g−1), respectively, and the long cycling stability with a high specific capacity up to 205 mA h g−1after 3000 cycles at 10 A g−1. The synergistic contributions of dual ions and Ca2+electrolyte additives on battery performances were systematically investigated by multiple in-/ex-situcharacterisations to reveal reversible structural/chemical evolutions and enhanced electrochemical kinetics, highlighting the significance of electrolyte-governed conversion reaction process. Through the computational approach, reinforced “pillar” effects, charge screening effects and regulated electronic structures derived from pre-intercalated dual ions were elucidated for contributing to boosted charge storage properties.