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Preparation method of positive electrode material, water-based zinc ion battery positive electrode and application

A positive electrode material and dual-ion technology, applied in the field of aqueous zinc-ion batteries, can solve problems such as poor ion diffusion kinetics, poor cycle performance and rate capability, unstable structure, etc., and achieve low price, good cycle performance and rate performance, The effect of low doping

Pending Publication Date: 2022-01-28
XI AN JIAOTONG UNIV
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  • Description
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Problems solved by technology

[0004] In the above system, vanadium-based compounds represented by vanadium pentoxide exhibit high capacity and high rate capability, however, their unstable structure and poor ion diffusion kinetics lead to poor cycle performance and rate capability.

Method used

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  • Preparation method of positive electrode material, water-based zinc ion battery positive electrode and application
  • Preparation method of positive electrode material, water-based zinc ion battery positive electrode and application
  • Preparation method of positive electrode material, water-based zinc ion battery positive electrode and application

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preparation example Construction

[0044] A method for preparing a dual-ion co-doped vanadium pentoxide positive electrode material of the present invention comprises the following steps:

[0045] S1, put V 2 o 5 Powder, two soluble doping metal salts are mixed and then added H 2 o 2 solution and stirred until the end of the reaction;

[0046] will V 2 o 5 The concentration of the mixed solution is controlled to be 0.05~0.09mol / L, and the molar ratio of the two kinds of soluble doping metal salts is 1:(1~5); the two kinds of soluble doping metal salts and V 2 o 5 The molar ratio of feeding is 1:(8~12).

[0047] Preferably, the stirring time of the mixed solution is controlled within 40-60 minutes.

[0048] The soluble doping metal salt is one or more of nickel acetate, zinc acetate, manganese acetate, magnesium acetate, lithium acetate, sodium acetate and calcium acetate.

[0049] S2. Transfer the mixed liquid to a hydrothermal kettle for hydrothermal reaction, keep it warm at 180-220°C for 46-50 hours...

Embodiment 1

[0057] 1. Weigh the raw material 3mmol V 2 o 5 The powder was dissolved in 24mL of deionized water, and the raw material 0.25mmol Mg(CH 3 COO) 2 4H 2 O crystals and 0.25mmol Zn(CH 3 COO) 2 2H 2 O crystals were respectively dissolved in 10 mL of deionized water, placed on a magnetic stirrer and stirred for 1 h;

[0058] 2. In the well-stirred V 2 o 5 Add dropwise 6mL mass fraction of 30% hydrogen peroxide solution in the aqueous solution, continue to stir on the magnetic stirrer for 40min, after that the Mg(CH 3 COO) 2 4H 2 O crystals and Zn(CH 3 COO) 2 2H 2 The O crystal mixed solution is added dropwise to obtain a precursor solution;

[0059] 3. Add the obtained solution into a hydrothermal kettle, put the hydrothermal kettle into an oven and heat it to 180°C for 48 hours. After the hydrothermal reaction is completed, cool it down to room temperature naturally, collect the product in the hydrothermal kettle, filter, and centrifuge and wash 3 times , vacuum dryi...

Embodiment 2

[0061] 1. Weigh the raw material 2.75mmol V 2 o 5 Dissolve the powder in 24mL of deionized water, weigh 0.25mmol CH 3 COOLi·2H 2 O crystals and 0.50 mmol Mg(CH 3 COO) 2 4H 2 O crystals were respectively dissolved in 10 mL of deionized water, placed on a magnetic stirrer and stirred for 1 h;

[0062] 2. In the well-stirred V 2 o 5 Add dropwise 6mL mass fraction of 30% hydrogen peroxide solution in the aqueous solution, continue to stir on the magnetic stirrer for 40min, after that the Mg(CH 3 COO) 2 4H 2 O crystals and CH 3 COOLi·2H 2 The O crystal mixed solution is added dropwise to obtain a precursor solution;

[0063] 3. Add the obtained solution into a hydrothermal kettle, put the hydrothermal kettle into an oven and heat it to 200°C for 48 hours. After the hydrothermal reaction is completed, cool it down to room temperature naturally, collect the product in the hydrothermal kettle, filter it, and wash it twice by centrifugation , vacuum drying at 90° C. for 8 ...

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Abstract

The invention discloses a preparation method of a positive electrode material, a water-based zinc ion battery positive electrode and application. The preparation method comprises the following steps: dissolving soluble doped metal salt in water, and uniformly stirring; meanwhile, uniformly stirring with a V2O5 aqueous solution added with an H2O2 solution, carrying out heat preservation treatment on the stirred liquid, cooling to room temperature, and then centrifugally washing and drying; and mixing a dried solid with a conductive agent and a binder to form positive electrode slurry, coating the positive electrode slurry to form a pole piece, drying the pole piece, and finally assembling high-purity zinc foil, 3mol L <-1 > Zn (CF3SO3) 2 or ZnSO4 aqueous electrolyte and a glass microfiber diaphragm or chemical analysis filter paper into the water-based zinc ion battery. The positive electrode material prepared on the basis of the preparation method shows excellent stability and relatively high reversible capacity in an electrochemical testing process, and has relatively great application potential.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion batteries, and in particular relates to a preparation method of a positive electrode material, a positive electrode of a water-based zinc-ion battery and an application thereof. Background technique [0002] Among various energy storage systems, lithium-ion batteries with high energy density and long cycle life dominate the commercial rechargeable battery market and have achieved great success in portable electronics and electric vehicles. However, their development has been greatly hampered by the limited lithium resources, environmental impact, and safety concerns arising from flammable organic electrolytes for large-scale deployment. Therefore, some aqueous metal-ion batteries with abundant element reserves and low cost have aroused the interest of researchers, among which the research enthusiasm of aqueous zinc-ion batteries has been increasing in recent years. Contrary to the to...

Claims

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Application Information

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IPC IPC(8): C01G31/02H01M4/48H01M10/36
CPCC01G31/02H01M4/48H01M10/36C01P2002/52C01P2002/72C01P2004/03C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 徐晨亮王鹏飞韩晓刚
Owner XI AN JIAOTONG UNIV
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