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Prussian blue nanoflower electrode material and its preparation method and application

A technology of Prussian blue and electrode materials, which is applied in the field of preparation of Prussian blue 6]3) nano-flower electrode materials, can solve problems such as huge volume effects, and achieve the effects of alleviating volume effects, high power, and long cycle life

Active Publication Date: 2022-03-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the larger size of potassium ions leads to a huge volume effect during battery charging and discharging, which has higher requirements on the stability and conductivity of electrode materials.

Method used

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  • Prussian blue nanoflower electrode material and its preparation method and application
  • Prussian blue nanoflower electrode material and its preparation method and application
  • Prussian blue nanoflower electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) First take 10mL 36% HCl, 10mL deionized water and 50mL DMF, stir and mix evenly at room temperature to obtain a clear and transparent solution A;

[0025] 2) Take 1mmol K 3 Fe(CN) 6 Dissolve in the above solution A, stir at room temperature for 10 minutes to obtain a light yellow clear and transparent solution;

[0026] 3) Transfer the solution to a 100mL polytetrafluoroethylene liner and put it into a reaction kettle, heat it in water at 70°C for 48 hours, take it out, and wait for it to cool naturally to room temperature;

[0027] 4) The product was collected by centrifugation, washed three times with deionized water and absolute ethanol, and dried under vacuum at 80°C.

[0028] The Prussian blue obtained above (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure electrode material as the application of potassium ion battery cathode material.

[0029] With this example product Prussian blue (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure electrode material ...

Embodiment 2

[0034] 1) First, take 10mL 36% HCl, 10mL deionized water and 50mL DMF, stir and mix evenly at room temperature to prepare a clear and transparent solution A;

[0035] 2) Take 2mmol K 3 Fe(CN) 6 Dissolve in the above solution A, stir at room temperature for 10 minutes to obtain a light yellow clear and transparent solution;

[0036] 3) Transfer the solution to a 100mL polytetrafluoroethylene liner and put it into a reaction kettle, heat it in water at 70°C for 48 hours, take it out, and wait for it to cool naturally to room temperature;

[0037] 4) The product was collected by centrifugation, washed three times with deionized water and absolute ethanol, and dried under vacuum at 80°C.

[0038] The Prussian blue obtained above (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure electrode material as the application of potassium ion battery cathode material.

[0039] With the Prussian blue (K) obtained in this embodiment 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure elect...

Embodiment 3

[0041] 1) First take 10mL 36% HCl, 10mL deionized water and 50mL DMF, stir and mix evenly at room temperature to prepare a clear and transparent solution A;

[0042] 2) Take 3mmol K 3 Fe(CN) 6 Dissolve in the above solution A, stir at room temperature for 10 minutes to obtain a light yellow clear and transparent solution;

[0043] 3) Transfer the solution to a 100mL polytetrafluoroethylene liner and put it into a reaction kettle, heat it in water at 70°C for 48 hours, take it out, and wait for it to cool naturally to room temperature;

[0044] 4) The product was collected by centrifugation, washed three times with deionized water and absolute ethanol, and dried under vacuum at 80°C.

[0045] The Prussian blue obtained above (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure electrode material as the application of potassium ion battery cathode material.

[0046] With the Prussian blue (K) obtained in this embodiment 1.4 Fe 4 [Fe(CN) 6 ] 3 ) nanoflower structure electr...

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Abstract

The invention relates to a method for preparing an electrode material of Prussian blue nanoflowers assembled by ultrathin nanosheets, the chemical formula of which is K 1.4 Fe 4 [Fe(CN) 6 ] 3 , consisting of ultra-thin nanosheets with a thickness of 5-10nm, the diameter of the Prussian blue nanoflowers is 400-600nm, and its specific surface area is 111.8m 2 g ‑1 . Beneficial effects of the present invention: the Prussian blue compound is dissolved and recrystallized under acidic conditions, thereby obtaining a surface self-assembled Prussian blue nanoflower structure electrode material, which exhibits high power and stable cycle when used as a positive electrode active material for a potassium ion battery Second, the raw materials used in the present invention are cheap, the process is simple, the reaction conditions are mild and can be used for mass production; finally, the present invention is highly feasible, easy to scale up, and meets the requirements of green chemistry, which is conducive to market promotion .

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a Prussian blue (K 1.4 Fe 4 [Fe(CN) 6 ] 3 ) The preparation method of the nano flower electrode material, the material can be used as the positive electrode active material of the novel potassium ion battery. Background technique [0002] Although lithium-ion batteries have been widely used due to their advantages such as high energy density and low self-discharge rate. However, considering the cost increase caused by the shortage of lithium resources and the uneven distribution of lithium resources, the development of new energy storage systems is becoming increasingly urgent. Sodium and potassium resources have more abundant natural reserves, so they have received extensive attention. In contrast, potassium ions exhibit better ionic conductivity and ion transport kinetics due to their smaller hydrated ion radius, while potassium ions have a lower...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCY02E60/10
Inventor 李琪覃明盛麦立强王选朋
Owner WUHAN UNIV OF TECH