Preparation and application methods of hydrous ferrovanadium oxide as aqueous magnesium ion battery cathode material

Abstract

The invention provides preparation and application methods of hydrous ferrovanadium oxide as an aqueous magnesium ion battery cathode material. The preparation method comprises the following steps: dropwise adding an ammonium metavanadate solution into a ferric salt solution, stirring the mixed solution at room temperature for 2h; transferring the mixed solution into a reaction vessel and carrying out a hydrothermal reaction, and filtering, washing and drying sediment to obtain linear hydrous ferrovanadium oxide; mixing at the mass ratio of acetylene black to polyvinylidene fluoride to linear hydrous ferrovanadium oxide being 10%: 10%: 80% to prepare an electrode paste, and coating carbon cloth with the paste and drying at 80-100 DEG C to obtain an aqueous magnesium ion battery cathode pole piece. Cheap transition metal salt is used as a raw material, the cost is low, and sources are wide. By using rich reserves of water resources and cheap magnesium salt as an electrolyte, cost is greatly reduced, and the defect that an organic electrolyte is flammable and combustible and pollutes the environment is avoided. The green and environmental-protection requirement is achieved, and safety factor during the production and application process is raised.

Description

technical field [0001] The invention relates to a preparation method of hydrated iron vanadium oxide. The invention also relates to an application method of the hydrated iron vanadium oxide as the negative electrode of the aqueous magnesium ion battery. Background technique [0002] Aqueous batteries have attracted widespread attention due to their abundant water resources, low cost of inorganic salts, high safety, and environmental protection. At the same time, aqueous batteries have high ion conductivity, thick electrode sheets, and are easy to process. It has a good application prospect. In the aqueous battery system, the first research is the high-energy-density aqueous lithium-ion battery. However, lithium resources are limited and expensive, and it is difficult to achieve large-scale production; subsequently, people have developed aqueous sodium-ion batteries. Sodium salt is used as the electrolyte, but the radius of the sodium ion is relatively large, which leads to...

AI Technical Summary

Problems solved by technology

In the aqueous battery system, the first research is the high-energy-density aqueous lithium-ion battery. However, lithium resources are limited and expensive, and it is difficult to achieve large-scale production; subsequently, people have developed aqueous sodium-ion batteries. Sodium salt is used as the electrolyte, but the radius of the sodium ion is relatively large, which leads to poor cycle performance of the battery; therefore, the aqueous magnesium ion battery came into being, the radius of magnesium ion and lithium ion are similar, the electrochemical performance is similar, and the magnesium salt is more reserve Abundant, low cost, great application prospects

At present, VO has been researched and can be applied to the anode materials of aqueous batteries. 2 、LiV 3 o 8 、Na 3 V 2 (PO 4 ) 3 However, the research on negative electrode materials for aqueous magnesium ion batteries is even more limited, and there are very few negative electrodes suitable for magnesium ion deintercalation.

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