Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ca$^{2+}$ pre-intercalated bilayered vanadium oxide for high-performance aqueous Mg-ion batteries
https://orcid.org/0000-0002-2507-5477
https://orcid.org/0000-0002-7828-183X
https://orcid.org/0000-0002-5134-7130
https://orcid.org/0000-0001-9295-2110
The “oxygen-rich” Ca$^{2+}$ pre-intercalated bilayered vanadium oxide (CaVOnH) was synthesized via hydrothermal method and determined as a monoclinic structure with reasonable lattice parameters. CaVOnH achieves a first discharge capacity of 273 mAh g$^{-1}$ with capacity retention of 91% at 50 mA g$^{-1}$ in 0.8 m Mg(TFSI)2–85%PEG-15%H$_2$O (polyethylene glycol, PEG), but limited rate capability due to the low ionic conductivity of electrolyte. Dimethyl sulfoxide (DMSO) is used as a co-solvent to tune the physical-chemical properties of aqueous Mg-ion electrolyte (AME), resulting in the reorganization of Mg$^{2+}$ solvation and hydrogen bond network. The AME containing DMSO shows improved ionic conductivity, low viscosity, and high Mg$^{2+}$ diffusion coefficient and allows CaVOnH and V$_2$O$_5$ to achieve a much-improved rate capability and capacity. Moreover, the reaction mechanism and reversibility of CaVOnH are elucidated by combining in operando and ex situ techniques. The results demonstrate that CaVOnH undergoes 2-phase reaction and solid solution, the variation of oxidation state and the local environment of vanadium, and reversible formation/decomposition of MgF$_2$ cathode electrolyte interface during Mg$^{2+}$ (de)intercalation, where MgF$_2$ originated from the decomposition of TFSI$^−$.
Ca$^{2+}$ pre-intercalated bilayered vanadium oxide for high-performance aqueous Mg-ion batteries
https://orcid.org/0000-0002-2507-5477
https://orcid.org/0000-0002-7828-183X
https://orcid.org/0000-0002-5134-7130
https://orcid.org/0000-0001-9295-2110
The “oxygen-rich” Ca$^{2+}$ pre-intercalated bilayered vanadium oxide (CaVOnH) was synthesized via hydrothermal method and determined as a monoclinic structure with reasonable lattice parameters. CaVOnH achieves a first discharge capacity of 273 mAh g$^{-1}$ with capacity retention of 91% at 50 mA g$^{-1}$ in 0.8 m Mg(TFSI)2–85%PEG-15%H$_2$O (polyethylene glycol, PEG), but limited rate capability due to the low ionic conductivity of electrolyte. Dimethyl sulfoxide (DMSO) is used as a co-solvent to tune the physical-chemical properties of aqueous Mg-ion electrolyte (AME), resulting in the reorganization of Mg$^{2+}$ solvation and hydrogen bond network. The AME containing DMSO shows improved ionic conductivity, low viscosity, and high Mg$^{2+}$ diffusion coefficient and allows CaVOnH and V$_2$O$_5$ to achieve a much-improved rate capability and capacity. Moreover, the reaction mechanism and reversibility of CaVOnH are elucidated by combining in operando and ex situ techniques. The results demonstrate that CaVOnH undergoes 2-phase reaction and solid solution, the variation of oxidation state and the local environment of vanadium, and reversible formation/decomposition of MgF$_2$ cathode electrolyte interface during Mg$^{2+}$ (de)intercalation, where MgF$_2$ originated from the decomposition of TFSI$^−$.
Ca$^{2+}$ pre-intercalated bilayered vanadium oxide for high-performance aqueous Mg-ion batteries
https://orcid.org/0000-0002-2507-5477
https://orcid.org/0000-0002-7828-183X
https://orcid.org/0000-0002-5134-7130
https://orcid.org/0000-0001-9295-2110
The “oxygen-rich” Ca$^{2+}$ pre-intercalated bilayered vanadium oxide (CaVOnH) was synthesized via hydrothermal method and determined as a monoclinic structure with reasonable lattice parameters. CaVOnH achieves a first discharge capacity of 273 mAh g$^{-1}$ with capacity retention of 91% at 50 mA g$^{-1}$ in 0.8 m Mg(TFSI)2–85%PEG-15%H$_2$O (polyethylene glycol, PEG), but limited rate capability due to the low ionic conductivity of electrolyte. Dimethyl sulfoxide (DMSO) is used as a co-solvent to tune the physical-chemical properties of aqueous Mg-ion electrolyte (AME), resulting in the reorganization of Mg$^{2+}$ solvation and hydrogen bond network. The AME containing DMSO shows improved ionic conductivity, low viscosity, and high Mg$^{2+}$ diffusion coefficient and allows CaVOnH and V$_2$O$_5$ to achieve a much-improved rate capability and capacity. Moreover, the reaction mechanism and reversibility of CaVOnH are elucidated by combining in operando and ex situ techniques. The results demonstrate that CaVOnH undergoes 2-phase reaction and solid solution, the variation of oxidation state and the local environment of vanadium, and reversible formation/decomposition of MgF$_2$ cathode electrolyte interface during Mg$^{2+}$ (de)intercalation, where MgF$_2$ originated from the decomposition of TFSI$^−$.
Ca$^{2+}$ pre-intercalated bilayered vanadium oxide for high-performance aqueous Mg-ion batteries
Fu, Qiang (Autor:in, ) / Wu, Xiaoyu (Autor:in) / Luo, Xianlin (Autor:in) / Ding, Ziming (Autor:in) / Indris, Sylvio (Autor:in) / Sarapulova, Angelina (Autor:in) / Meng, Zhen (Autor:in) / Desmau, Morgane (Autor:in) / Wang, Zhengqi (Autor:in) / Hua, Weibo (Autor:in)
01.01.2024
103212 pages
Energy storage materials 66, 103212 (2024). doi:10.1016/j.ensm.2024.103212
Sonstige
Elektronische Ressource
Englisch
Vanadium oxide nanowires for Li-ion batteries
| British Library Online Contents | 2011
| British Library Online Contents | 2007
Magnetomechanical response of bilayered magnetic elastomers
| British Library Online Contents | 2014
BiFeO3/Zn1-xMnxO bilayered thin films
| British Library Online Contents | 2011
Ferroelastic interactions in bilayered ferroelectric thin films
| British Library Online Contents | 2009