TY - CHAP

T1 - Metal Ions Pre-Intercalated Vanadium Oxides for Aqueous Zinc-Ion Batteries

AU - Волков, Алексей Игоревич

AU - Елисеева, Светлана Николаевна

AU - Толстопятова, Елена Геннадьевна

AU - Волков, Филипп Сергеевич

AU - Fu, Lijun

AU - Кондратьев, Вениамин Владимирович

PY - 2022/11/14

Y1 - 2022/11/14

N2 - The past decade has seen the rapid development of aqueous zinc-ion batteries (AZIB), which show promise due to their low cost, environmental safety, high specific capacity and rate capability. The layered structure of vanadium oxide (V2 O5 ) and the possibility of multielectron redox processes with formation of V5+, V4+, and V3+ species provide high theoretical capacity of 586 mA h g−1 via mixed intercalation of zinc ions and protons. However, repetitive intercalation along with incorporation of water molecules into the interlayer space causes the gradual degradation of the crystal structure of V2 O5 with weakly bound layers, and amorphization of the material occurs, negatively affecting cycling stability. One strategy to improve the functional properties of vanadium oxide cathodes is to tune the interlayer space of the host material by doping it with guest metal ions. This approach of incorporating strongly bound species that expand and stabilize the layered structures is known as pillaring. In such structures, only the reversible increase of the linear dimensions of the crystal perpendicular to the layers occurs upon recharging. The expansion of layers via pillaring both improves diffusion of zinc ions in the interlayer space and stabilizes crystal structure. Here we report the results of the experimental studies on the synthesis, structure, and electrochemical properties of vanadium oxides pre-intercalated with metal ions (Na + , Co2+) as cathode materials for zinc-ion batteries. The structure, composition, and morphology of the materials have been studied using X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy. The electrochemical properties of the obtained pre-intercalated vanadium oxides (Co xV 2 O 5, Na xV 2 O 5) were studied in CR2032 cells with zinc anode, aqueous 3 mol dm−3 ZnSO 4 electrolyte, and Whatman GF/A glass fiber separators by cyclic voltammetry and galvanostatic charge-discharge methods. Among these, the best specific capacity values were obtained for Co xV 2 O 5 electrodes, which provided up to 380 mA h g−1 at a current density of 0.1 A g−1, while the specific capacitance values for Na xV 2 O 5 reached 299 mA h g−1. The authors would like to thank the Centre for X-ray Diffraction Studies, the Interdisciplinary Resource Centre for Nanotechnology, the Centre for Physical Methods of Surface Investigation of the Research Park of Saint Petersburg State University. The work was funded by RFBR and NSFC (grant № 21-53- 53012).

AB - The past decade has seen the rapid development of aqueous zinc-ion batteries (AZIB), which show promise due to their low cost, environmental safety, high specific capacity and rate capability. The layered structure of vanadium oxide (V2 O5 ) and the possibility of multielectron redox processes with formation of V5+, V4+, and V3+ species provide high theoretical capacity of 586 mA h g−1 via mixed intercalation of zinc ions and protons. However, repetitive intercalation along with incorporation of water molecules into the interlayer space causes the gradual degradation of the crystal structure of V2 O5 with weakly bound layers, and amorphization of the material occurs, negatively affecting cycling stability. One strategy to improve the functional properties of vanadium oxide cathodes is to tune the interlayer space of the host material by doping it with guest metal ions. This approach of incorporating strongly bound species that expand and stabilize the layered structures is known as pillaring. In such structures, only the reversible increase of the linear dimensions of the crystal perpendicular to the layers occurs upon recharging. The expansion of layers via pillaring both improves diffusion of zinc ions in the interlayer space and stabilizes crystal structure. Here we report the results of the experimental studies on the synthesis, structure, and electrochemical properties of vanadium oxides pre-intercalated with metal ions (Na + , Co2+) as cathode materials for zinc-ion batteries. The structure, composition, and morphology of the materials have been studied using X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy. The electrochemical properties of the obtained pre-intercalated vanadium oxides (Co xV 2 O 5, Na xV 2 O 5) were studied in CR2032 cells with zinc anode, aqueous 3 mol dm−3 ZnSO 4 electrolyte, and Whatman GF/A glass fiber separators by cyclic voltammetry and galvanostatic charge-discharge methods. Among these, the best specific capacity values were obtained for Co xV 2 O 5 electrodes, which provided up to 380 mA h g−1 at a current density of 0.1 A g−1, while the specific capacitance values for Na xV 2 O 5 reached 299 mA h g−1. The authors would like to thank the Centre for X-ray Diffraction Studies, the Interdisciplinary Resource Centre for Nanotechnology, the Centre for Physical Methods of Surface Investigation of the Research Park of Saint Petersburg State University. The work was funded by RFBR and NSFC (grant № 21-53- 53012).

M3 - тезисы в сборнике материалов конференции

SP - 156

EP - 157

BT - Тезисы XVII международной конференции «Актуальные проблемы преобразования энергии в литиевых электрохимических системах»

T2 - XVII международная конференция "Актуальные проблемы преобразования энергии в литиевых электрохимических системах"

Y2 - 14 November 2022 through 18 November 2022

ER -