NVP/GO/CNT flexible integrated membrane electrode and preparation method thereof

A membrane electrode and flexible technology, applied in the field of flexible integrated NVP/GO/CNT membrane electrode and its preparation, can solve problems such as reduction

Active Publication Date: 2021-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method provided by the present invention is simple to operate. NVP, GO, and CNT are made into a solution, and then the three are mixed, and after vacuum filtration and drying, a fl

Method used

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  • NVP/GO/CNT flexible integrated membrane electrode and preparation method thereof
  • NVP/GO/CNT flexible integrated membrane electrode and preparation method thereof
  • NVP/GO/CNT flexible integrated membrane electrode and preparation method thereof

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preparation example Construction

[0021] The invention provides a method for preparing a flexible integrated NVP / GO / CNT membrane electrode, comprising the following steps:

[0022] (1) Configure NVP, GO, and CNT materials as solutions respectively;

[0023] (2) mixing the three solutions obtained in the step (1) to obtain a mixed solution;

[0024] (3) The mixed solution was vacuum filtered and dried to obtain the NVP / GO / CNT membrane electrode.

[0025] In the present invention, the NVP material is preferably prepared by a sol-gel method or a solid-phase method, more preferably by a sol-gel method. The NVP particles prepared by the sol-gel method are more uniform and nanoscale.

[0026] In the present invention, the GO is prepared by chemical method, preferably modified Hummer's method, Brodie method or Staudenmaier method, more preferably modified Hummer's method.

[0027] In the present invention, there is no special regulation on the source of the CNT material, and the CNT well-known to those skilled in ...

Embodiment 1

[0035] Add 80mg of NVP into 20mL of deionized water, sonicate for 60min, then stir for 40min to prepare NVP dispersion; add 10mg of GO to 10mL of deionized water, sonicate for 120min, then stir for 30min to prepare GO dispersion; add 10mg of CNT into 20mL of deionized water , sonicated for 160 min, and then stirred for 50 min to prepare the CNT dispersion; under the condition of GO stirring, use a disposable dropper to sequentially add the NVP and CNT dispersion into the GO dispersion, and stir at 400 r / min for 60 min. , using a disposable dropper to draw 3mL of the mixed solution dropwise onto the Celgard membrane for vacuum filtration, after peeling off at room temperature, put it in a vacuum oven at 110°C, and dry for 12h to obtain NVP / GO / CNT flexible integrated composite membrane electrode .

[0036] The obtained NVP / GO / CNT flexible integrated composite membrane electrode was scanned with an electron microscope, and the results are as follows: figure 1 shown; from figure...

Embodiment 2

[0050] Add 28mg of NVP into 10mL of deionized water, sonicate for 60min, then stir for 40min to prepare NVP dispersion; add 4mg of GO to 4mL of deionized water, sonicate for 150min, then stir for 60min to prepare GO dispersion; add 8mg of CNT into 16mL of deionized water , sonicated for 120min, and then stirred for 50min to prepare the CNT dispersion; under the condition of GO stirring, use a disposable dropper to sequentially add the NVP and CNT dispersion to the GO dispersion, and stir at 400r / min for 60min. , use a disposable dropper to draw 2mL of the mixed solution dropwise onto the Celgard membrane for vacuum filtration. After peeling off at room temperature, put it in a vacuum oven at 110°C and dry for 12h to obtain NVP / GO / CNT flexible integrated composite membrane electrode .

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Abstract

The invention relates to the technical field of sodium ion batteries, and provides a preparation method of an NVP/GO/CNT flexible integrated membrane electrode, which comprises the following steps: dispersing NVP, GO and CNT into a solvent, then sequentially dropwise adding NVP and CNT into a GO solution, uniformly mixing, performing vacuum filtration to form a membrane, and drying to obtain the NVP/GO/CNT membrane electrode. The NVP/GO/CNT flexible integrated membrane electrode is prepared through a simple vacuum filtration method, in the obtained material, NVP serves as an active material, GO serves as a binder and CNT serves as a conductive agent, the NVP, the GO and the CNT are evenly mixed, the CNT constructs an interconnected conductive network, and efficient conduction of charges is facilitated; and the NVP and the CNT are uniformly dispersed among the GO sheet layers, so that the agglomeration of the GO sheet layers is reduced, and the permeation and transmission of the electrolyte are accelerated. The sodium ion battery obtained by taking the NVP/GO/CNT membrane electrode obtained by the preparation method provided by the invention as a positive electrode material of the sodium ion battery has high sodium storage capacity and excellent rate and cycle performance.

Description

technical field [0001] The invention relates to the technical field of sodium ion battery materials, in particular to a flexible integrated NVP / GO / CNT membrane electrode and a preparation method thereof. Background technique [0002] Na-ion batteries have shown bright prospects in the field of large-scale energy storage applications due to their abundant resources, low cost, and good safety. Electrode materials are an important part of batteries. At present, the positive electrode materials of sodium-ion batteries mainly include transition metal oxides, polyanionic compounds, Prussian blue, etc. Among them, the polyanionic compound Na 3 V 2 (PO 4 ) 3 (NVP) is the most promising cathode material for Na-ion batteries due to its fast sodium ion conductor structure and good thermal stability, but its rate performance is limited by poor electronic conductivity and needs to be modified. Combining it with materials with good conductivity, such as graphene, carbon nanotubes (CNT...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/66H01M10/054H01M4/133H01M4/1393
CPCH01M4/0404H01M4/667H01M10/054H01M4/133H01M4/1393Y02E60/10
Inventor 徐斌常夏青朱奇珍
Owner BEIJING UNIV OF CHEM TECH
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