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Mo2C/C nano composite material as well as preparation method thereof and lithium carbon dioxide battery cathode comprising Mo2C/C nano composite material as well as reparation method thereof

A technology of nanocomposite materials and mixtures, which is applied in the field of electrochemical energy, can solve the problems of unfavorable practical application, high cost of precious metal ruthenium, and insignificant positive polarization effect of carbon material catalysts, etc., and achieves lower charging voltage platform, simple preparation method, The catalytic effect is remarkable

Inactive Publication Date: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high cost of the noble metal ruthenium, it is not conducive to practical application, and the effect of carbon material catalysts on reducing the polarization of the positive electrode is not significant

Method used

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  • Mo2C/C nano composite material as well as preparation method thereof and lithium carbon dioxide battery cathode comprising Mo2C/C nano composite material as well as reparation method thereof
  • Mo2C/C nano composite material as well as preparation method thereof and lithium carbon dioxide battery cathode comprising Mo2C/C nano composite material as well as reparation method thereof
  • Mo2C/C nano composite material as well as preparation method thereof and lithium carbon dioxide battery cathode comprising Mo2C/C nano composite material as well as reparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] (1) ammonium molybdate, citric acid and sodium chloride are dissolved in deionized water, and magnetically stirred to obtain a uniform aqueous solution, wherein the mass ratio of ammonium molybdate and citric acid is 1:1;

[0037] (2) freeze-drying the aqueous solution obtained in step (1) to obtain a mixture;

[0038] (3) The mixture obtained in step (2) is reduced in a mixed atmosphere of argon and hydrogen, wherein the volume ratio of hydrogen and argon in the argon-hydrogen mixture is 5:95, and the heating rate of the reduction process is 3° C. / min, The target temperature for reduction is 800°C and kept for 3 hours;

[0039] (4) Wash and dry the reduced mixture of step (3) with deionized water to obtain Mo 2 C / C nanocomposites.

Embodiment 2

[0041] (1) Ammonium molybdate, citric acid and sodium chloride are dissolved in deionized water, and magnetically stirred to obtain a uniform aqueous solution, wherein the mass ratio of ammonium molybdate and citric acid is 1:1.2;

[0042] (2) freeze-drying the aqueous solution obtained in step (1) to obtain a mixture;

[0043] (3) The mixture obtained in step (2) is reduced in a mixed atmosphere of argon and hydrogen, wherein the volume ratio of hydrogen and argon in the argon-hydrogen mixture is 5:95, and the heating rate of the reduction process is 5° C. / min, The target temperature for reduction is 750°C and kept for 3 hours;

[0044] (4) Wash and dry the reduced mixture of step (3) with deionized water to obtain Mo 2 C / C nanocomposites.

Embodiment 3

[0046] (1) Ammonium molybdate, citric acid and sodium chloride are dissolved in deionized water, and magnetically stirred to obtain a uniform aqueous solution, wherein the mass ratio of ammonium molybdate and citric acid is 1:1.5;

[0047] (2) freeze-drying the aqueous solution obtained in step (1) to obtain a mixture;

[0048](3) The mixture obtained in step (2) is reduced in a mixed atmosphere of argon and hydrogen, wherein the volume ratio of hydrogen and argon in the argon-hydrogen mixture is 5:95, and the heating rate of the reduction process is 5° C. / min, The target temperature for reduction is 900°C and kept for 3 hours;

[0049] (4) Wash and dry the reduced mixture of step (3) with deionized water to obtain Mo 2 C / C nanocomposites.

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Abstract

The invention relates to a Mo2C / C nano composite material as well as a preparation method thereof and a lithium carbon dioxide battery cathode comprising the Mo2C / C nano composite material as well asa preparation method thereof, and belongs to the technical field of electrochemical energy. Ammonium molybdate is taken as a molybdenum source, and citric acid is taken as a carbon source to prepare the Mo2C / C nano composite material by utilizing reducing characteristics of hydrogen gas. A lithium carbon dioxide battery cathode plate is prepared through a coating method, the Mo2C / C nano compositematerial and PVDF are mixed as coating slurry for being coated on a current collector, so as to obtain the lithium carbon dioxide battery cathode containing the Mo2C / C nano composite material. The lithium carbon dioxide battery cathode containing the Mo2C / C nano composite material effectively relieves the battery cathode polarization problem, and reduces the charging over-potential of a lithium carbon dioxide battery, so that the lithium carbon dioxide battery can stably and efficiently operate.

Description

technical field [0001] The present invention relates to a Mo 2 The invention relates to a C / C nanocomposite material and a preparation method thereof, a positive electrode of a lithium carbon dioxide battery containing the material and a preparation method thereof, and belongs to the technical field of electrochemical energy. Background technique [0002] With the rapid development of human society and the burning of tens of thousands of tons of fossil fuels (coal, natural gas and petroleum products) every year, the emission of carbon dioxide in the atmosphere is increasing year by year. Carbon dioxide is the main greenhouse gas, and the increase in carbon dioxide concentration has caused severe climate change, and there is an urgent need to reduce carbon dioxide emissions into the atmosphere. However, since the carbon atoms in CO2 are in the highest oxidation state, converting CO2 into other chemical substances requires a lot of energy, which will inevitably lead to additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08B82Y30/00
CPCB82Y30/00H01M4/9083H01M12/08Y02E60/10
Inventor 徐静李硕高秀丽杨广武白鹏刘振王钊李彦鹏邢伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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