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Ultra-long cycle H-doped VO2(B) cathode for high capacity aqueous Zn-ion battery by K. Guan; Keyu Duan; Gaochen Yang; Li Tao; Haonan Zhang; Houzhao Wan; Rong Yang; Jun Zhang; Hanbin Wang; Hao Wang is a Engineering article available to read on EtoBox.

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VO 2 H-doped Oxygen vacancy Ascorbic acid Aqueous zinc-ion battery a b s t r a c t VO 2 as a potential type of cathode material for aqueous Zn-ion batteries (AZIBs) has attracted increasing interest over the past few years, owing to the various oxidation states of vanadium and unique tunnel transport pathway. However, the major challenge for VO 2 is the absence of a high-capacity and stable structure because of the slow electron transport kinetics and the collapsible crystal structure. Herein, an ultra-long life H-doped VO 2 is obtained by an efficient chelation reaction with ascorbic acid (AA). Benefiting from the H-doped, the crystallinity of VO 2 is reduced, and the oxygen vacancies and electron conductivity in VO 2 are enhanced, which is also confirmed by the calculated results of Density Functional Theory (DFT). Based on the H-doped VO 2 (AA-VO 2 ), ultra-long 22,000 cycles at 10 A g À1 are obtained as well as high specific capacity (572 mAh g À1 ) and energy density (443 Wh kg À1 ) at 0.2 A g À1 . By contrast, the AZIBs with untreated VO 2 exhibit only 251 mAh g À1 specific capacity and 235 Wh kg À1 energy density. And the batteries can work no more than 2000 cycles. Therefor

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Author

K. Guan; Keyu Duan; Gaochen Yang; Li Tao; Haonan Zhang; Houzhao Wan; Rong Yang; Jun Zhang; Hanbin Wang; Hao Wang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)