K-ion Modified V2O5 with Abundant Oxygen Defects As Cathode for Aqueous Zinc-Ion Battery
MATERIALS LETTERS（2024）
North Minzu Univ
Abstract
Aqueous zinc-ion batteries (ZIBs) are anticipated to be used for grid-scale energy storage because of their low cost, abundant resources, high safety, and non-toxicity. In this study, K-ion modified V2O5 with abundant oxygen defects (K0.1V2O5) was prepared using a one-step hydrothermal reaction followed by heat treatment. K0.1V2O5 showed remarkable specific capacity (307.9 mAhg-1 at 0.2 Ag-1), exceptional rate capability (184.3 mAhg-1 at 10 Ag- 1), and good cycling stability (88.5 % capacity retention rate after 2000 cycles at 10 Ag- 1). Furthermore, electrochemical kinetics revealed that the electrochemical process of the K0.1V2O5 electrode is governed by both ion diffusion and capacitive contribution, with the diffusion coefficient of Zn2+ ranging between 10- 11 and 10- 9 cm2 s-1. The exceptional performance of K0.1V2O5 makes it a promising candidate for cathode materials in zincion batteries (ZIBs).
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Key words
K0.1V2O3,Defects,Cathode,Energy storage and conversion,Aqueous zinc-ion batteries
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