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A lithium-air battery based on graphene oxide-carbon paper gas catalytic electrode

A gas catalytic electrode and air battery technology, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problem of electrode conductivity damage, oxygen transmission channel blockage, and charging failure. and other problems, to achieve the effect of large discharge capacity, improved stability, and reduced ohmic voltage drop

Inactive Publication Date: 2016-08-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant evidence shows that the discharge product Li 2 o 2 or Li 2 O is insoluble in the non-aqueous electrolyte. After a discharge, a large number of discharge products accumulate disorderly on the air side of the electrode, while there are basically no discharge products on the side of the diaphragm, resulting in blockage of the oxygen transmission channel and termination of the discharge.
Moreover, solid Li 2 o 2 or Li 2 O ion crystals are almost insulators, once generated and piled up disorderly, the conductivity of the electrode will be destroyed, making charging impossible

Method used

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  • A lithium-air battery based on graphene oxide-carbon paper gas catalytic electrode
  • A lithium-air battery based on graphene oxide-carbon paper gas catalytic electrode
  • A lithium-air battery based on graphene oxide-carbon paper gas catalytic electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Graphene oxide at 1.0mg / cm 3 The concentration of ultrasonic dispersion in double distilled water, adding KH 2 PO 4 and K 2 HPO 4 , prepared into a phosphate buffer solution with pH 9.0, and continued to ultrasonically disperse for 6 hours to make it into a uniformly dispersed suspension. The electrophoresis-electrolytic cell is assembled with a platinum electrode as the negative electrode and carbon paper as the positive electrode. The voltage of the electrolytic cell is controlled at 20V by the stabilized power supply, and the temperature of the electrolyte is controlled at 45°C. The surface is evenly attached and deposited, using a uniform stirring device, the stirring rate is 2000r / min, and the electrolysis reaction time is 5min. The carbon paper electrode loaded with graphene oxide was cleaned with twice distilled water, and its Raman spectrum is shown in the attached Figure 6 . The cleaned carbon paper electrodes loaded with graphene oxide were baked in a v...

Embodiment 2

[0035] Graphene oxide at 2.0mg / cm 3 The concentration of ultrasonic dispersion in double distilled water, adding KH 2 PO 4 and K 2 HPO 4 , prepared into a phosphate buffer solution with a pH of 8.0, and continued ultrasonic dispersion for 6 hours to form a uniformly dispersed suspension. The electrophoresis-electrolytic cell is assembled with a platinum electrode as the negative electrode and carbon paper as the positive electrode. The voltage of the electrolytic cell is controlled at 15V by the stabilized power supply, and the temperature of the electrolyte is controlled at 35°C. During the electrolysis process, in order to make the graphene oxide on the carbon paper The surface is uniformly attached and deposited, using a uniform stirring device, the stirring rate is 3000r / min, and the electrolysis reaction time is 15min. The carbon paper electrode loaded with graphene oxide was cleaned with double distilled water, and the cleaned carbon paper electrode loaded with graph...

Embodiment 3

[0038] Graphene oxide at 3.0mg / cm 3 The concentration of ultrasonic dispersion in double distilled water, adding KH 2 PO 4 and K 2 HPO 4 , prepared into a phosphate buffer solution with pH 7.0, and continued to ultrasonically disperse for 6 hours to make it into a uniformly dispersed suspension. The electrophoresis-electrolytic cell is assembled with a platinum electrode as the negative electrode and carbon paper as the positive electrode. The voltage of the electrolytic cell is controlled at 8V by the stabilized power supply, and the temperature of the electrolyte is controlled at 25°C. During the electrolysis process, in order to make the graphene oxide on the carbon paper The surface is uniformly attached and deposited, using a uniform stirring device, the stirring rate is 4000r / min, and the electrolysis reaction time is 25min. The carbon paper electrode loaded with graphene oxide was cleaned with double distilled water, and the cleaned carbon paper electrode loaded wit...

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Abstract

The invention provides a lithium-air battery based on a graphene oxide-carbon paper gas catalytic electrode, the positive electrode of the battery is a graphene oxide catalytic electrode supported by carbon paper prepared by the following method, and the preparation method is as follows: graphite oxide The alkene is ultrasonically dispersed in a phosphate buffer solution into a suspension state to prepare an electrolyte; then, the carbon paper is used as the positive electrode and the platinum electrode is used as the negative electrode, and the voltage of the electrolytic cell is controlled at 5-20V. 5 to 30 minutes, after the electrolytic deposition is completed, the graphene oxide is loaded on the carbon paper; the carbon paper is washed with twice distilled water, then vacuum-dried, and finally the graphene oxide loading on the carbon paper is weighed and measured with an analytical balance. The invention has simple preparation steps, easy control of operating parameters, stable and reproducible electrode performance, the first discharge capacity reaches 11553mAh / g at a current density of 0.1mA / cm2, and the performance of the cycle battery is stable after 520 hours of operation.

Description

technical field [0001] The invention provides a lithium-air battery, in particular to a lithium-air battery based on a graphene oxide-carbon paper gas catalytic electrode, which belongs to the lithium-air battery and its preparation technology. Background technique [0002] A lithium-air battery is a secondary battery that uses metallic lithium as the negative electrode and air as the positive electrode. It has a completely different design from lithium-ion batteries, and its theoretical specific energy is 11140Wh / kg (excluding oxygen mass), which is close to the theoretical specific energy value of gasoline of 13000Wh / kg. Even considering the quality of oxygen, its specific energy is ten times that of ordinary lithium-ion batteries (5210Wh / kg). In 1996, Dr. Abraham of EIC Laboratory in Massachusetts reported for the first time the lithium-air battery of this new polymer electrolyte system, which obtained a discharge specific capacity of 1400Ah / kg, which is close to the act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/08H01M4/96
CPCH01M4/8853H01M4/96H01M12/08Y02E60/10
Inventor 张萍章晶李雅静陈翔宇洪建和傅凤英何岗
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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