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Vanadate hydrate electrode material, preparation method thereof and application of vanadate hydrate electrode material

A technology of electrode materials and hydrates, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of low ion diffusion coefficient, unusable high ion conductivity of electrolyte, and poor performance, so as to achieve simple preparation and improve ion diffusion ability , the effect of excellent performance

Inactive Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, aqueous Zn-ion batteries also have significant disadvantages
First of all, zinc ions carry two charges, and compared with monovalent lithium ions, they are subjected to stronger electrostatic interactions during the process of inserting and extracting from the lattice of the active material, resulting in a lower ion diffusion coefficient.
Because of this intrinsic defect, the performance of traditional electrode materials is poor, and the high ionic conductivity of the electrolyte cannot be utilized.

Method used

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  • Vanadate hydrate electrode material, preparation method thereof and application of vanadate hydrate electrode material
  • Vanadate hydrate electrode material, preparation method thereof and application of vanadate hydrate electrode material
  • Vanadate hydrate electrode material, preparation method thereof and application of vanadate hydrate electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Weigh 5.0mmol V 2 o 5 Add to 65ml of deionized water, heat at 60°C and stir. Then weigh an appropriate amount of Ni (CH 3 COO) 2 4H 2 O and (CH 3 COO) 2 Mg·4H 2 O, CH 3 Add COOK to it, continue heating and stirring for 60 min to obtain a homogeneous solution. Then 2ml of ethanol and 3ml of acetone were added.

[0040] (2) Transfer the solution of step (1) to an 85ml hydrothermal reaction kettle, and carry out hydrothermal reaction at 200°C for 24 hours. After the reaction, the reaction kettle is naturally cooled at room temperature, and the resulting product is filtered and washed with deionized water. and ethanol were washed three times, and dried to obtain Ni 0.25 V 2 o 5 ·H 2 O, Mg 0.25 V 2 o 5 ·H 2 O and K 0.5 V 2 o 5 ·H 2 O samples.

[0041] The phases of the nickel vanadate, magnesium vanadate and potassium vanadate obtained in this example were determined by X-ray diffraction pattern (XRD), and their microscopic morphology was determined...

Embodiment 2

[0044] (1) Weigh 5.0mmol V 2 o 5 Add to 65ml of deionized water, heat at 60°C and stir. Then weigh an appropriate amount of Ni (CH 3 COO) 2 4H 2 O, (CH 3 COO) 2 Mg·4H 2 O and CH 3 Add COOK to it, continue heating and stirring for 60 min to obtain a homogeneous solution. Then 2 ml of ethanol was added to the solution.

[0045] (2) Transfer the solution of step (1) to an 85ml hydrothermal reaction kettle, and carry out hydrothermal reaction at 200°C for 24 hours. After the reaction, the reaction kettle is naturally cooled at room temperature, and the resulting product is filtered and washed with deionized water. and ethanol were washed three times, and dried to obtain the product.

[0046] Compared with Example 1, due to not adding acetone, the pressure in the reactor is small, and the obtained Ni 0.25 V 2 o 5 ·H 2 O, Mg 0.25 V 2 o 5 ·H 2 O and K 0.5 V 2 o 5 ·H 2 O has poor crystallinity or a small amount of impurities. The XRD pattern compares the Ni prep...

Embodiment 3

[0048] (1) Weigh 5.0mmol V 2 o 5 Add to 65ml of deionized water, heat at 60°C and stir. Then weigh an appropriate amount of Ni (CH 3 COO) 2 4H 2 O, (CH 3 COO) 2 Mg·4H 2 O and CH 3 Add COOK to it, continue heating and stirring for 60 min to obtain a homogeneous solution. Then 2 ml of ethanol and 5 ml of acetone were added to the solution.

[0049] (2) Transfer the solution of step (1) to an 85ml hydrothermal reaction kettle, and carry out hydrothermal reaction at 200°C for 24 hours. After the reaction, the reaction kettle is naturally cooled at room temperature, and the resulting product is filtered and washed with deionized water. and ethanol were washed three times, and dried to obtain the product.

[0050] Compared with Example 1, due to adding more acetone, the pressure in the reactor is larger, and high crystallinity Ni is also obtained. 0.25 V 2 o 5 ·H 2 O, Mg 0.25 V 2 o 5 ·H 2 O and K 0.5 V 2 o 5 ·H 2 O samples, the electrochemical performance is no...

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Abstract

The invention belongs to the technical field of nano materials and electrochemistry, and discloses a vanadate hydrate electrode material, a preparation method thereof and the application of the vanadate hydrate electrode material. The chemical formula of the vanadate hydrate electrode material is Ni <0.25>V<2>O<5>.H<2> O, Mg <0.25>V< 2 >O<5>.H <2> O or K<0.5>V<2>O<5>.H<2>O. According to the preparation method, a vanadium source compound is weighed and added into deionized water, so that a vanadium source solution is obtained; a nickel source compound, a magnesium source compound or a potassiumsource compound is added; heating and stirring are performed to obtain a uniform solution; a reducing agent ethanol is added, so that hydrothermal reaction can be carried out; and a product is separated, so that the vanadate hydrate electrode material can be obtained. As an active material of a novel zinc ion positive electrode, the material is excellent in electrochemical performance, relativelyhigh in specific capacity, good in cycling stability and excellent in rate capability. In addition, the method is simple in process and low in cost, and has universality for synthesizing vanadium bronze hydrates.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and in particular relates to a vanadate hydrate electrode material and a preparation method and application thereof. Background technique [0002] In recent years, the shortage of energy resources caused by the excessive use of fossil fuels and the environmental problems on a global scale have become increasingly prominent. Efficient use of renewable energy has become an inevitable trend of sustainable development. However, renewable energy systems such as wind energy, solar energy, and tidal energy are unevenly distributed and energy conversion is unstable and discontinuous. Electric energy storage can store these scattered energies and provide stable and continuous output when needed. In addition, new energy vehicles based on electric energy storage are gradually trying to replace fossil fuel-burning vehicles in various countries in order to reduce the use of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/62H01M10/36B82Y40/00
CPCB82Y40/00H01M4/362H01M4/485H01M4/5825H01M4/628H01M10/36H01M2004/021H01M2004/028Y02E60/10
Inventor 赵彦明俸靖杰
Owner SOUTH CHINA UNIV OF TECH
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