Vanadium(V) oxide coated by poly(3,4-ethylenedioxythiophene) as cathode for aqueous zinc-ion batteries with improved electrochemical performance

• Published in: Materials letters 2022-02, Vol.308, p.131210, Article 131210
• Main Authors: Volkov, F.S., Tolstopjatova, E.G., Eliseeva, S.N., Kamenskii, M.A., Vypritskaia, A.I., Volkov, A.I., Kondratiev, V.V.
• Format: Article
• Language: English
• Subjects: Aqueous zinc-ion batteries, V2O5; Cathodes; Composite materials; Electrochemical analysis; Electrochemical performance; Electrode materials; Energy storage and conversion; Materials science; Oxidation; Poly(3,4-ethylenedioxythiophene); Rechargeable batteries; Vanadium pentoxide; Zinc
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.131210

[Display omitted] •V2O5/PEDOT electrodes reach high steady-state capacity without activation processes.•PEDOT coated V2O5 reaches 380 mA⋅h⋅g−1 at 0.3 A⋅g−1 and 344 mA⋅h⋅g−1 at 1 A⋅g−1.•PEDOT layer enhances the properties of the electrode, compared to pristine V2O5. Vanadium(V) oxide was coated by poly(3,4-ethylenedioxythiophene) (PEDOT) by chemical oxidation of EDOT. The obtained composite (V2O5/PEDOT) was studied as cathode material for aqueous zinc-ion batteries. V2O5/PEDOT electrodes demonstrate excellent electrochemical performance in the (0.3–1.4) V (vs. Zn/Zn2+) potential range in comparison to electrodes based on the pristine V2O5. V2O5/PEDOT material provides high specific capacity 380 mA⋅h⋅g−1 at 0.3 A⋅g−1, improved C-rate capability (274 mA⋅h⋅g−1 and 102 mA⋅h⋅g−1 at 5 A⋅g−1 and 20 A⋅g−1, and better stability during long-term cycling (7% capacity fading during 200 cycles at 5 A⋅g−1).