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Polyaniline in-situ polymerization intercalated vanadium pentoxide and preparation method and application thereof

A vanadium pentoxide, in-situ polymerization technology, applied in the direction of vanadium oxide, hybrid capacitor electrodes, electrical components, etc., can solve the problems of decreased cycle stability, hindered ion diffusion, unstable structure, etc., to increase the interlayer distance and Effects of internal surface area, enhanced diffusion rate, and easy control of reaction conditions

Pending Publication Date: 2020-10-30
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when vanadium pentoxide is used as the positive electrode material of the secondary battery, the interlayer is still too small and the structure is unstable during the cycle, which hinders ion diffusion, resulting in serious capacity fading and decreased cycle stability.

Method used

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  • Polyaniline in-situ polymerization intercalated vanadium pentoxide and preparation method and application thereof
  • Polyaniline in-situ polymerization intercalated vanadium pentoxide and preparation method and application thereof
  • Polyaniline in-situ polymerization intercalated vanadium pentoxide and preparation method and application thereof

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preparation example Construction

[0026] The invention provides a method for preparing polyaniline in-situ polymerization intercalation vanadium pentoxide, comprising the following steps:

[0027] 1) mixing vanadium pentoxide powder, water and hydrogen peroxide to obtain solution a;

[0028] 2) After mixing the aniline monomer and water, use an acid solution to adjust the pH value to obtain solution b;

[0029] 3) react after mixing solution a and solution b to obtain polyaniline in-situ polymerization intercalation vanadium pentoxide.

[0030] The ratio of vanadium pentoxide powder, water and hydrogen peroxide in step 1) of the present invention is preferably 1-20mmol: 1-200mL: 1-20mL, more preferably 5-15mmol: 50-150mL: 5-15mL, more preferably 10~12mmol: 100~120mL: 10~12mL.

[0031] The mixing time in step 1) of the present invention is preferably 1-24 hours, more preferably 10-20 hours, more preferably 15-18 hours; the mass fraction of the hydrogen peroxide is preferably 20-40%, more preferably 30%; The ...

Embodiment 1

[0045]Add 10 mmol of vanadium pentoxide powder with a particle size of 10 μm into 120 mL of deionized water, then add 10 mL of 30% hydrogen peroxide and stir for 2 hours to obtain a uniform solution a. Dissolve 1 mmol of aniline monomer into 200 mL of deionized water, and adjust the pH value to 4 with 0.8 mol / L hydrochloric acid to obtain a homogeneous solution b. The homogeneous solution a was heated to 160°C under the condition of an oil bath and mixed with the homogeneous solution b, and the reaction was continued for 3 hours at 160°C under the condition of an oil bath. After the reaction, cool to room temperature, centrifuge the cooled product, wash it, freeze-dry it at -53°C for 72 hours, and store it in a vacuum oven at 120°C with a vacuum of 3KPa for 2h to obtain polyaniline with a mass fraction of 10%. 1. Polyaniline in-situ polymerized and intercalated vanadium pentoxide with a thickness of 50nm.

[0046] PVDF binder, conductive carbon black and active material (poly...

Embodiment 2

[0050] Add 15 mmol of vanadium pentoxide powder with a particle size of 50 μm into 160 mL of deionized water, then add 15 mL of hydrogen peroxide with a mass fraction of 30% and stir for 15 hours to obtain a homogeneous solution a. Dissolve 0.4 mmol of aniline monomer into 300 mL of deionized water, and adjust the pH value to 1 with 8 mol / L hydrochloric acid to obtain a homogeneous solution b. After heating the homogeneous solution a to 100°C under the oil bath condition, mix it with the homogeneous solution b, and continue to react at 100°C under the oil bath condition for 15 hours. After the reaction, cool to room temperature, centrifuge the cooled product, wash it, freeze-dry it at -55°C for 48 hours, and store it in a vacuum oven at 220°C with a vacuum of 4KPa for 1 hour to obtain polyaniline with a mass fraction of 35%. 1. Polyaniline in-situ polymerized and intercalated vanadium pentoxide with a thickness of 400nm.

[0051] PVDF binder, conductive carbon black and activ...

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Abstract

The invention belongs to the technical field of electrode materials, and provides a preparation method of polyaniline in-situ polymerization intercalated vanadium pentoxide. The preparation method comprises the following steps of: mixing vanadium pentoxide powder, water and hydrogen peroxide to obtain a solution a; mixing an aniline monomer with water, and adjusting the pH value with an acid solution to obtain a solution b; and mixing the solution a and the solution b, and reacting to obtain polyaniline in-situ polymerization intercalated vanadium pentoxide. Vanadium pentoxide powder is used as a vanadium source, aniline monomer in-situ polymerization is used as intercalation molecules, and hydrogen peroxide is used as a cosolvent to prepare polyaniline in-situ polymerization intercalatedvanadium pentoxide with high specific capacity, excellent cycling stability and excellent rate capability. The first specific discharge capacities of the electrode material disclosed by the inventionare respectively 330-390mAh. g <-1> and 120-180mAh. g <-1> under the current densities of 1A. g <-1 > and 5A. g <-1>.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a polyaniline in-situ polymerized intercalation vanadium pentoxide and a preparation method and application thereof. Background technique [0002] Rechargeable secondary batteries have been widely used in wearable devices, electric vehicles and other fields. With the development of society, people's demand for high specific capacity batteries is becoming more and more urgent. However, the current commercial cathode material lithium iron phosphate and ternary cathode materials have a theoretical capacity of 160-220mAh g -1 Left and right, it is difficult to meet people's needs. Therefore, it is urgent to find cathode materials with high specific capacity to meet the market demand. The vanadium-based oxide has a higher theoretical capacity (300-400mAh g -1 ), is a potential high specific capacity cathode material, and its large interlayer spacing It can provide a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y40/00H01M4/48H01G11/46
CPCC01G31/02B82Y40/00H01M4/483H01G11/46C01P2004/03C01P2004/04C01P2006/40C01P2004/20Y02E60/10
Inventor 王明珊张俊李星
Owner SOUTHWEST PETROLEUM UNIV
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