Preparation method of vanadium compound electrode material and application of vanadium compound electrode material in aqueous zinc ion battery

A zinc-ion battery and electrode material technology, applied in the field of electrochemical materials, can solve problems such as insufficient loading capacity and insufficient battery performance, and achieve the effects of increasing the loading capacity per unit area, improving electrochemical performance, and avoiding peeling

Inactive Publication Date: 2020-09-08
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0004] In view of the above problems, the present invention studies and designs a preparation method of a vanadium compound electrode material and its application in an aqueous zinc-ion battery to solve the problem of insufficient loading per unit area of ​​the positive active material of the traditional aqueous zinc-ion battery. Disadvantages of insufficient battery performance

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  • Preparation method of vanadium compound electrode material and application of vanadium compound electrode material in aqueous zinc ion battery
  • Preparation method of vanadium compound electrode material and application of vanadium compound electrode material in aqueous zinc ion battery
  • Preparation method of vanadium compound electrode material and application of vanadium compound electrode material in aqueous zinc ion battery

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preparation example Construction

[0024] A preparation method of a vanadium compound electrode material and its application in an aqueous zinc-ion battery, comprising the following steps:

[0025] S1. Preparation of active materials: Dissolve the vanadium compound with solvent water, seal the mixed solution in an autoclave, and then keep it at 100-200°C for 2-120 hours, after cooling to room temperature, wash the product with deionized water Once, after drying (freeze drying, blast drying and natural drying, etc.), the desired vanadium compound active material is obtained.

[0026] S2. Preparation of high-loaded vanadium-based compound electrode sheets: the obtained vanadium-based compound, conductive carbon and conductive binder are used in a specific weight ratio (6:3:1 or 7:2:1 or 8:1:1) Mix to form a uniform slurry, immerse the three-dimensional current collector in the slurry, then take it out to dry, repeat the above immersion and drying process several times, until the vanadium compound electrode sheet ...

Embodiment 1

[0030] Preparation of vanadium dioxide active material: Take vanadium pentoxide solid and add it to distilled water, add a certain amount of oxalic acid, stir in a water bath at 80°C for 1 hour, the mixed solution will turn into a dark blue solution, and then seal the mixed solution in an autoclave , and then kept at 180°C for 4 hours. After cooling to room temperature, the product was washed several times with deionized water to obtain vanadium dioxide nanorods.

[0031] Preparation of vanadium dioxide positive electrode on three-dimensional current collector: 3 mg·mL -1 The vanadium dioxide was mixed with conductive carbon and conductive binder in a weight ratio of 7:2:1 to form a homogeneous slurry. Immerse a piece of carbon felt with a diameter of 10mm as a three-dimensional current collector into the slurry, then take it out to dry, repeat this process 10-30 times, and obtain a mass load of 3-15mg / cm 2 electrode pads.

[0032] Assembly of water-based zinc-ion battery: ...

Embodiment 2

[0034] Preparation of vanadium pentoxide active material: Add solid ammonium vanadate to distilled water, add a certain amount of hydrochloric acid, the mixed solution will turn into a brown solution, then seal the mixed solution in an autoclave, and then keep it at 120°C for 24 hours. After cooling to room temperature, the product was washed several times with deionized water to obtain vanadium pentoxide material.

[0035] Preparation of vanadium pentoxide cathode on a three-dimensional current collector: 3 mg·mL -1 The vanadium pentoxide was mixed with conductive carbon and conductive binder in a weight ratio of 7:2:1 to form a homogeneous slurry. A piece of carbon felt with a diameter of 10 mm was immersed in the slurry as a three-dimensional current collector, and then taken out to dry. This process was repeated 10-30 times until an electrode sheet with the desired mass load was obtained.

[0036] Assembly of water-based zinc-ion battery: The prepared electrode sheet, fil...

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Abstract

The invention discloses a preparation method of a vanadium compound electrode material and application of the vanadium compound electrode material in an aqueous zinc ion battery. The method comprisesthe following steps: dispersing a vanadium compound into a water solvent; performing maintaining for 2 to 120 hours at a temperature of 100 to 200 DEG C; performing cooling to room temperature, performing washing and drying to obtain a vanadium compound active material; mixing the obtained vanadium compound active material with a conductive adhesive according to a mass ratio of (6-9): (4-1) to prepare a slurry, immersing a current collector into the slurry, taking out the current collector, performing drying, and repeating the immersing and drying processes for 10-30 times to obtain a vanadiumcompound electrode material; and taking the obtained vanadium compound electrode material as a positive electrode material, taking a Zn foil as a negative electrode, and preparing the aqueous zinc ion battery from the vanadium compound electrode material and a battery electrolyte. By utilizing the conductive adhesive and the three-dimensional current collector, the conductivity of the electrode is improved, the unit area loading capacity of an active material on the electrode is improved, and the electrochemical performance of the aqueous zinc ion battery is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, and in particular relates to a preparation method of a vanadium compound electrode material and its application in an aqueous zinc-ion battery. Background technique [0002] With the development and progress of society, the demand for energy in people's life is gradually increasing. However, non-renewable energy sources such as coal, oil, and natural gas are gradually exhausted, and their use produces a large amount of pollution, which makes the ecological environment continue to deteriorate. In order to solve these problems, it is necessary to develop new clean energy sources, such as wind energy, solar tidal energy, etc. But these energies are intermittent and cannot be used directly, so devices that can store these energies on a large scale are needed. Lithium-ion battery is the most widely used secondary battery in our daily life. It can be recycled and has the advantages of small s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/70H01M4/04H01M10/36
CPCH01M4/362H01M4/48H01M4/621H01M4/622H01M4/624H01M4/70H01M4/0416H01M10/36Y02E60/10
Inventor 王昕宇麻力文孙俊才
Owner DALIAN MARITIME UNIVERSITY
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