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Laminated Na3V2(PO4)3@rGo nanocomposite and preparation method and application therefor

A nanocomposite material, NH4H2PO4 technology, applied in the field of nanomaterials and electrochemistry, to achieve the effect of shortening the diffusion distance, improving electrochemical performance, excellent cycle stability and high rate characteristics

Active Publication Date: 2016-03-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But changing Na by hydrothermal method 3 V 2 (PO 4 ) 3 The surface charge and electrical properties of the precursor interact with the graphene oxide hydrogel interface group to form a uniformly dispersed and long-term stable mixed gel dispersion system, and then maintain the internal structure of the precursor through freeze-drying technology, and finally through post-heat treatment Synthesis of a layered Na 3 V 2 (PO 4 ) 3 @rGO nanocomposites remain unreported

Method used

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  • Laminated Na3V2(PO4)3@rGo nanocomposite and preparation method and application therefor
  • Laminated Na3V2(PO4)3@rGo nanocomposite and preparation method and application therefor
  • Laminated Na3V2(PO4)3@rGo nanocomposite and preparation method and application therefor

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Experimental program
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Effect test

Embodiment 1

[0038] Layered Na 3 V 2 (PO 4 ) 3 The preparation method of @rGO nanocomposite material, it comprises the following steps:

[0039] 1) Add 0.75mmolNa 2 CO 3 , 1mmolV(C 5 h 7 o 2 ) 3 , 1.5mmolNH 4 h 2 PO 4 Dissolve in 40mL deionized water;

[0040] 2) ultrasonically treat the solution obtained in step 1) for 60 minutes, and then stir for 120 minutes in a water bath at 80°C;

[0041] 3) Transfer the light blue precursor mixture obtained in step 2) to a 50mL reactor, heat it with water at 180°C for 8 hours, and cool it down to room temperature naturally;

[0042] 4) Add 10 mg of graphene oxide to the green jelly-like gel obtained in step 3) and stir until uniformly dispersed;

[0043] 5) The uniformly mixed gel dispersion obtained in step 4) is dried by freeze-drying technology;

[0044] 6) After grinding the dried product obtained in step 5), in 750°C Ar / H 2 Calcined under the atmosphere for 6 hours, the heating rate was 2 °C / min, and the layered Na 3 V 2 (PO ...

Embodiment 2

[0050] Layered Na 3 V 2 (PO 4 ) 3 @rGO nanocomposite preparation method, which includes the following steps:

[0051] 1) Add 0.75mmolNa 2 CO 3 , 1mmolV(C 5 h 7 o 2) 3 , 1.5mmolNH 4 h 2 PO 4 Dissolve in 40mL deionized water;

[0052] 2) ultrasonically treat the solution obtained in step 1) for 30 minutes, and then stir for 60 minutes in a water bath at 90°C;

[0053] 3) Transfer the light blue precursor mixture obtained in step 2) to a 50mL reactor, heat it with water at 180°C for 10 hours, and cool it down to room temperature naturally;

[0054] 4) Add 20 mg of graphene oxide to the green jelly-like gel obtained in step 3) and stir until evenly dispersed;

[0055] 5) The uniformly mixed gel dispersion obtained in step 4) is dried by freeze-drying technology;

[0056] 6) After grinding the dried product obtained in step 5), in 750°C Ar / H 2 Calcined under the atmosphere for 6 hours, the heating rate was 2 °C / min, and the layered Na 3 V 2 (PO 4 ) 3 @rGO nanoco...

Embodiment 3

[0059] Layered Na 3 V 2 (PO 4 ) 3 @rGO nanocomposite preparation method, which includes the following steps:

[0060] 1) Add 1.5mmolNa 2 CO 3 , 2mmolV(C 5 h 7 o 2 ) 3 , 3mmolNH 4 h 2 PO 4 Dissolve in 70mL deionized water;

[0061] 2) After ultrasonically treating the solution obtained in step 1) for 60 minutes, stir it in a water bath at 80°C for 60 minutes;

[0062] 3) Transfer the light blue precursor mixture obtained in step 2) to a 100mL reactor, heat it with water at 180°C for 8 hours, and cool it down to room temperature naturally;

[0063] 4) Add 30 mg of graphene oxide to the green jelly-like gel obtained in step 3) and stir until uniformly dispersed;

[0064] 5) The uniformly mixed gel dispersion obtained in step 4) is dried by freeze-drying technology;

[0065] 6) After grinding the dried product obtained in step 5), in 700°C Ar / H 2 Calcined under the atmosphere for 8 hours, the heating rate was 2 °C / min, and the layered Na 3 V 2 (PO 4 ) 3 @rGO na...

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Abstract

The invention relates to a laminated Na3V2(PO4)3@rGo nanocomposite and an preparation method and an application therefor. The nanocomposite can be used as a sodium ion battery positive electrode active material with high rate capability and long service life; and the nanocomposite is formed by a sheet structure and rGO nano-sheets in a layer-to-layer overlapping manner, wherein the sheet structure is formed by nanoscale sub-unit Na3V2(PO4)3 particles. When the laminated Na3V2(PO4)3@rGo nanocomposite is used as the sodium ion battery positive electrode active material, the material is excellent in cycling stability and high in rate capability, so that the laminated Na3V2(PO4)3@rGo nanocomposite is the potential application material for the sodium ion batteries with high rate capability and long service life; and in addition, the preparation method is simple in process, capable of meeting the green chemistry demand, low in equipment requirement and good for the marketization promotion.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a layered Na 3 V 2 (PO 4 ) 3 @rGO nanocomposite material and its preparation method, the material can be used as a high-rate, long-life anode active material for sodium-ion batteries. Background technique [0002] Energy storage plays an important role in today's society. Just like electric vehicles, mobile phones, and notebook computers, electric devices and electronic products are constantly being updated, which has an urgent requirement for energy storage devices with high power and high energy density. In order to meet these demands, lithium battery, as an energy storage and functional device, is a better choice because of its advantages of high energy density, long cycle life and relative environmental protection. However, limited lithium resources will inevitably face a shortage problem. Lithium is expensive and has a small content in the ear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/483H01M4/5825H01M10/054Y02E60/10
Inventor 安琴友徐亚楠麦立强魏湫龙盛进之
Owner WUHAN UNIV OF TECH
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