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Iodine-doped graphene-coated graded-hole Prussian blue nanospheres and preparation method and application of hierarchical pore Prussian blue nanosphere

A graphene-wrapped, Prussian blue technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of cycle instability, low charge and discharge capacity, poor conductivity, etc. Good chemical properties, good rate performance, small size effect

Inactive Publication Date: 2020-01-31
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hierarchically porous Prussian blue nanosphere based on iodine-doped graphene wrapping and its preparation method and application, aiming to solve the poor conductivity, low charge and discharge capacity and cycle instability of lithium batteries in the prior art technical issues

Method used

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  • Iodine-doped graphene-coated graded-hole Prussian blue nanospheres and preparation method and application of hierarchical pore Prussian blue nanosphere
  • Iodine-doped graphene-coated graded-hole Prussian blue nanospheres and preparation method and application of hierarchical pore Prussian blue nanosphere
  • Iodine-doped graphene-coated graded-hole Prussian blue nanospheres and preparation method and application of hierarchical pore Prussian blue nanosphere

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Embodiment 1

[0041] A preparation method based on iodine-doped graphene-wrapped hierarchical hole Prussian blue nanospheres, comprising the following steps:

[0042] (1) put K 3 [Fe(CN) 6 ] (0.1g) was dissolved in deionized water, added surfactant PVP (3.0g), ultrasonically stirred to clear liquid, then added 0.5 M HCl solution, after stirring for 60 min, a light yellow solution was formed and transferred to a 100 mL flask . Then put it into a water bath and raise the temperature to 80° C. under magnetic stirring, react for 24 hours, and then cool down to room temperature. The precipitate was collected by centrifugation, washed several times with distilled water and ethanol, and dried under vacuum at 60 °C for 12 h to obtain solid FeFe(CN) 6 Nanosphere precursors.

[0043] (2) the solid FeFe(CN) prepared by step (1) 6 Nanosphere precursor (0.15g) and surfactant PVP (0.45g) were added to 1.0 M HCl solution, stirred evenly, placed in a sealed stainless steel autoclave, and heated to 115...

Embodiment 2

[0046] A preparation method based on iodine-doped graphene-wrapped hierarchical hole Prussian blue nanospheres, comprising the following steps:

[0047] (1) put K 3 [Fe(CN) 6 ] (0.1g) was dissolved in deionized water, added surfactant PVP (3.0g), ultrasonically stirred to clear liquid, then added 0.5 M HCl solution, after stirring for 60 min, a light yellow solution was formed and transferred to a 100 mL flask . Then put it into a water bath and raise the temperature to 80° C. under magnetic stirring, react for 24 hours, and then cool down to room temperature. The precipitate was collected by centrifugation, washed several times with distilled water and ethanol, and dried under vacuum at 60 °C for 12 h to obtain solid FeFe(CN) 6 Nanosphere precursors.

[0048] (2) the solid FeFe(CN) prepared by step (1) 6 Nanosphere precursor (0.15g) and surfactant PVP (0.45g) were added to 1.0 M HCl solution, stirred evenly, placed in a sealed stainless steel autoclave, and heated to 115...

Embodiment 3

[0051] A preparation method based on iodine-doped graphene-wrapped hierarchical hole Prussian blue nanospheres, comprising the following steps:

[0052] (1) put K 3 [Fe(CN) 6 ] (0.1g) was dissolved in deionized water, added surfactant PVP (3.0g), ultrasonically stirred to clear liquid, then added 0.5 M HCl solution, after stirring for 60 min, a light yellow solution was formed and transferred to a 100 mL flask . Then it was put into a water bath and heated to 70° C. under magnetic stirring, reacted for 22 hours, and then cooled to room temperature. The precipitate was collected by centrifugation, washed several times with distilled water and ethanol, and dried under vacuum at 50 °C for 10 h to obtain solid FeFe(CN) 6 Nanosphere precursors.

[0053] (2) the solid FeFe(CN) prepared by step (1) 6 Nanosphere precursor (0.15g) and surfactant PVP (0.60g) were added to 1.5 M HCl solution, stirred evenly, placed in a sealed stainless steel autoclave, and heated to 120°C at a rate...

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Abstract

The invention provides iodine-doped graphene-coated graded-hole Prussian blue nanospheres and a preparation method and application thereof. Inorganic acids are added to FeFe (CN) 6 nanosphere precursors at different temperatures for etching reaction to prepare FeFe (CN) 6 nanospheres with hollow graded-hole structures, and iodine-doped graphene is added for uniform and compact coating through an ultrasonic and freeze composite drying process to obtain the doped graphene-coated graded-hole Prussian blue nanospheres (namely FeFe (CN) 6 @ IG). According to the preparation method, the conductivityof the hollow graded hole FeFe (CN) 6 nanospheres can be further increased, and better performance can be maintained after multiple charging and discharging. A lithium ion battery negative electrodematerial prepared from the material has good capacity, good stability and recyclability, and the capacity maintenance rate is as high as more than 90%, and the preparation method is simple in process,convenient to operate, and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of battery applications, in particular to a Prussian blue nanosphere with hierarchical pores wrapped by iodine-doped graphene, a preparation method and application thereof. Background technique [0002] With the rapid development of intelligent robots and new energy electric vehicles, lithium-ion batteries (LIBs) are widely used as primary energy storage devices. Existing lithium-ion batteries mostly use graphite as the negative electrode material, due to the relatively low theoretical capacity of graphite (LiC 6 372 mAh g -1 ) limit its application in real life, especially in new energy electric vehicles. Therefore, it is imminent to develop a new generation of lithium battery electrode materials. [0003] As the first synthetic polymer, Prussian blue (Fe 4 [Fe(CN) 6 ] 3 14H 2 O, PrussianBlue, referred to as PB), has excellent electrochemical reversibility, high stability, easy preparation, etc., so it has grea...

Claims

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Application Information

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IPC IPC(8): C01C3/12C01B32/194H01M4/36H01M4/38H01M4/62B82Y30/00
CPCB82Y30/00C01B32/194C01C3/12C01P2004/62C01P2004/80C01P2006/40H01M4/364H01M4/388H01M4/625Y02E60/10
Inventor 刘丹张新民王严杰
Owner DONGGUAN UNIV OF TECH
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