Lithium-air battery based on oxidized graphene-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: 2014-12-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
View PDF4 Cites 13 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium-air battery based on oxidized graphene-carbon paper gas catalytic electrode
  • Lithium-air battery based on oxidized graphene-carbon paper gas catalytic electrode
  • Lithium-air battery based on oxidized graphene-carbon paper gas catalytic electrode

Examples

Experimental program
Comparison scheme
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 Image 6 . The cleaned carbon paper electrodes loaded with graphene oxide were baked in a va...

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a lithium-air battery based on an oxidized graphene-carbon paper gas catalytic electrode. The positive electrode of the battery is an oxidized graphene catalytic electrode which is prepared by the following method and is supported by carbon paper. A preparation method comprises the steps of performing ultrasonic dispersion on oxidized graphene in a phosphate buffering solution to form a suspension state so as to prepare electrolyte; then the carbon paper is used as positive electrode, and a platinum electrode is used as a negative electrode; the voltage of an electrolytic battery is controlled to be 5-20V; under a proper stirring speed and proper temperature, electrophoresis-electrolysis is performed for 5-30 minutes; after electrolytic deposition is ended, oxidized graphene is loaded on the carbon paper; the carbon paper is washed by secondary distilled water and is dried under vacuum; finally a load of the oxidized graphene on the carbon paper is weighed and metered by an analysis balance. The preparation steps are simple; operation parameters are easy to control; the performance of the electrodes is stable, and reproduction is realized; under the current density of 0.1mA / cm<2>, the first discharge capacity is 11,553mAh / g; after the circulating battery runs for 520 hours, the performance is stable.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap