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Flexible self-supporting MoO2@C nanofiber thin film material, preparation method and applications thereof

A technology of nanofiber and film materials, applied in the field of preparation of self-supporting flexible films, can solve the problems of not meeting the requirements of flexibility and weakening electron transmission, etc., and achieve excellent cycle stability, simple and easy-to-control preparation method, and low energy consumption Effect

Inactive Publication Date: 2020-04-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the above two methods are all powder materials, which need to add a large amount of conductive additives (such as 10-20 wt% conductive carbon black) and binder coating to obtain electrodes, which not only weakens the electron transport, but also cannot meet the requirements of flexibility. sexual demands

Method used

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  • Flexible self-supporting MoO2@C nanofiber thin film material, preparation method and applications thereof
  • Flexible self-supporting MoO2@C nanofiber thin film material, preparation method and applications thereof
  • Flexible self-supporting MoO2@C nanofiber thin film material, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Take 0.45 g of (NH 4 ) 6 Mo 7 o 24 4H 2 Dissolve O in a mixture of deionized water and 10 mL of ethylene glycol at a volume ratio of 2:1, heat and stir at 80°C and 600 r / min to completely dissolve to obtain solution A;

[0041] (2) Take 1.3 g of PVP with an average molecular weight of 1,300,000 and add it to solution A, stir it under a magnetic stirrer to dissolve it completely, and stir for 12 hours to obtain solution B;

[0042](3) The solution B was electrospun with a positive voltage of 15 kV, a negative voltage of -5 kV, a receiving distance of 15 cm, and a spinning temperature of 40 °C. , get MoO 2 @C fiber precursor;

[0043] (4) Dry the obtained molybdenum dioxide@carbon fiber precursor in an oven at 60 °C for 24 h;

[0044] (5) The dried precursor was pre-oxidized in a muffle furnace. The pre-oxidation temperature was 240 °C, the heating rate was 1 °C / min, and the pre-oxidation time was 3 h. get MoO 2 @C nanofiber film precursor;

[0045] (6) MoO ...

Embodiment 2

[0047] (1) Take 0.4 g of (NH 4 ) 6 Mo 7 o 24 4H 2 Dissolve O in a 10mL mixture of deionized water and ethylene glycol at a volume ratio of 1:1, heat and stir at 80°C and 600 r / min to completely dissolve to obtain solution A;

[0048] (2) Take 1.3 g of PVP with an average molecular weight of 1,300,000 and add it to solution A, stir it under a magnetic stirrer to dissolve it completely, and stir for 12 hours to obtain solution B;

[0049] (3) The solution B was electrospun with a positive voltage of 15 kV, a negative voltage of -5 kV, a receiving distance of 15 cm, and a spinning temperature of 40 °C. , get MoO 2 @C fiber precursor;

[0050] (4) will get MoO 2 The @C fiber precursor was dried in an oven at 60 °C for 24 h;

[0051] (5) The dried precursor was pre-oxidized in a muffle furnace. The pre-oxidation temperature was 250 °C, the heating rate was 1 °C / min, and the pre-oxidation time was 4 h. get MoO 2 @C nanofiber film precursor;

[0052] (6) MoO obtained in st...

Embodiment 3

[0054] (1) Take 0.45 g of Na 2 MoO 4 2H 2 Dissolve O in a mixture of deionized water and 10 mL of ethylene glycol at a volume ratio of 2:1, heat and stir at 80°C and 600 r / min to completely dissolve to obtain solution A;

[0055] (2) Take 1.3 g of PVP with an average molecular weight of 1,300,000 and add it to solution A, stir it under a magnetic stirrer to dissolve it completely, and stir for 12 hours to obtain solution B;

[0056] (3) The solution B was electrospun with a positive voltage of 15 kV, a negative voltage of -5 kV, a receiving distance of 15 cm, and a spinning temperature of 40 °C. , get MoO 2 @C fiber precursor;

[0057] (4) will get MoO 2 Dry the @C fiber precursor in an oven at 60°C for 24 hours;

[0058] (5) The dried precursor was pre-oxidized in a muffle furnace. The pre-oxidation temperature was 240 °C, the heating rate was 1 °C / min, and the pre-oxidation time was 3 h. get MoO 2 @C nanofiber film precursor;

[0059] (6) MoO obtained in step (5) 2...

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Abstract

The invention belongs to the technical field of preparation of self-supporting flexible films, and particularly relates to a method for synthesizing a MoO2@C nanofiber flexible film material through an electrostatic spinning technology. The method comprises the following steps: dissolving a molybdenum source in a mixed solution of deionized water and ethylene glycol to obtain a solution A; addingpolyvinylpyrrolidone (PVP) into the solution A, and dissolving to obtain a solution B; and carrying out electrostatic spinning, drying and pre-oxidation on the solution B, and sintering under an inertatmosphere condition to obtain the MoO2@C nanofiber flexible film material. The preparation method disclosed by the invention is simple, convenient and easy to control, low in energy consumption andless in pollution, and the thickness of the MoO2@C nanofiber film prepared by the method is controllable, so that a new method is provided for preparing a flexible self-supporting film material.

Description

technical field [0001] The invention belongs to the technical field of preparation of self-supporting flexible films, in particular to an electrospinning technology to synthesize MoO 2 @C nanofiber flexible film material and its preparation method and application. Background technique [0002] With the continuous progress of social life, there is an increasing demand for batteries with high reversible capacity, high stable cycle and ultra-long cycle life, and transition metal oxide-based anode materials have been extensively studied due to their ability to store more ions. Among various transition metal oxides, molybdenum dioxide (MoO 2 ) due to good electrical conductivity and high theoretical capacity (838mAh g -1 ) has received extensive attention. However, bulk MoO 2 The poor kinetics due to its slow ion migration hinders the capacity release, resulting in poor cycle performance and rate capability. To improve MoO 2 For the electrochemical performance, researchers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D71/02B01D69/12B01D67/00
CPCB01D71/024B01D71/64B01D69/12B01D67/0079
Inventor 原长洲王世超刘洋侯林瑞
Owner UNIV OF JINAN
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