Lithium-air battery positive electrode employing hydroxyl cobalt oxide as catalyst and preparation method of positive electrode

A technology for cobalt oxyhydroxide and lithium-air batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor battery cycle stability, high charging potential, poor cycle performance, etc., to promote electron transfer and reduce charging voltage. platform, the effect of reducing polarization

Inactive Publication Date: 2016-08-17
SICHUAN UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During charging (OER), lithium peroxide (Li 2 o 2 ) is decomposed into oxygen and metal lithium, but the reaction is difficult to occur, the charging potential is high, and the decomposition is incomplete, resulting

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 positive electrode employing hydroxyl cobalt oxide as catalyst and preparation method of positive electrode
  • Lithium-air battery positive electrode employing hydroxyl cobalt oxide as catalyst and preparation method of positive electrode
  • Lithium-air battery positive electrode employing hydroxyl cobalt oxide as catalyst and preparation method of positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] Preparation of positive electrode for lithium-air battery:

[0027] Weigh CoOOH, polyvinylidene fluoride and conductive carbon black (SP) according to the percentages of 30%, 20%, and 50%, and mix and grind CoOOH and SP in an agate mortar for 20 minutes to obtain a mixture. The polyvinylidene fluoride Dissolved in N-methylpyrrolidone, and added dropwise to the mixture to obtain a slurry. The amount of N-methylpyrrolidone can completely dissolve the polyvinylidene fluoride, and make the SP in the mixture and Cobalt oxyhydroxide is uniformly dispersed to obtain a slurry. The slurry is ultrasonically dispersed for 30 minutes, and then the ultrasonically dispersed slurry is coated on the nickel foam, and vacuum-dried at 120°C for 12 hours. After cooling to room temperature, use a hydraulic press at a pressure of 12MPa Press down to form an electrode sheet to obtain a lithium-air battery positive electrode with CoOOH as a catalyst. The carbon material content ...

Example Embodiment

[0035] Example 2

[0036] Preparation of positive electrode for lithium-air battery:

[0037] Weigh CoOOH, polyvinylidene fluoride and conductive carbon black (SP) according to the percentages of 15%, 25%, and 60%, and mix and grind CoOOH and SP in an agate mortar for 20 minutes to obtain a mixture. The polyvinylidene fluoride Dissolve in N-methylpyrrolidone and add it dropwise to the mixture to obtain a slurry. The amount of N-methylpyrrolidone can completely dissolve the polyvinylidene fluoride and make the SP and hydroxyl in the mixture Cobalt oxide is uniformly dispersed to obtain a slurry. The slurry is ultrasonically dispersed for 30 minutes, and then the uniformly ultrasonically dispersed slurry is coated on carbon paper, and vacuum-dried at 120°C for 12 hours. After cooling to room temperature, it is compressed with a hydraulic press at a pressure of 12MPa The electrode sheet is formed to obtain the positive electrode of the lithium air battery with CoOOH as the catalyst. ...

Example Embodiment

[0040] Example 3

[0041] Preparation of lithium-air battery cathode:

[0042] Weigh CoOOH, polyvinylidene fluoride and porous carbon according to the percentages of 15%, 25%, and 60%, and mix and grind CoOOH and porous carbon in an agate mortar for 20 minutes to obtain a mixture. Dissolve polyvinylidene fluoride in N -Methyl pyrrolidone, and added dropwise to the mixture to obtain a slurry. The amount of N-methyl pyrrolidone completely dissolves the polyvinylidene fluoride and makes the porous carbon and cobalt oxyhydroxide in the mixture Disperse the slurry uniformly to obtain the slurry, disperse the slurry ultrasonically for 30 minutes, and then coat the uniformly ultrasonically dispersed slurry on the foamed nickel, and dry it in vacuum at 120°C for 12 hours. After cooling to room temperature, press it into an electrode with a hydraulic press at a pressure of 12MPa The positive electrode of the lithium-air battery with CoOOH as the catalyst is obtained, and the carbon materia...

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

No PUM Login to view more

Abstract

The invention provides a lithium-air battery positive electrode employing hydroxyl cobalt oxide as a catalyst. The positive electrode comprises a positive electrode base material and a positive electrode material coating coated on the positive electrode base material; the positive electrode material coating is prepared from the following components in percentage by mass: 5%-40% of hydroxyl cobalt oxide as a catalyst component, 50%-90% of a carbon material and the balance of an adhesive. The invention further provides a method for preparing the positive electrode of the lithium-air battery. The method comprises the following steps: mixing and grinding a formula amount of hydroxyl cobalt oxide and carbon material, and dissolving the adhesive into a solvent to obtain an adhesive solution; mixing the fully mixed and ground mixture and the adhesive solution to from uniformly dispersed slurry; and coating the positive electrode base material with the uniformly dispersed slurry, and carrying out drying and pressing to obtain a positive plate of the lithium-air battery. The discharge capacity of the lithium-air battery can be improved; battery polarization is reduced; and the cycle times of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of metal-air batteries, in particular to a positive electrode of a lithium-air battery using cobalt oxyhydroxide as a catalyst and a preparation method thereof Background technique [0002] Cobalt oxyhydroxide (CoOOH) is often used as the preparation of Co 3 o 4 The precursor of Co can be directly sintered to prepare Co 3 o 4 , Lithium cobaltate can be prepared when mixed with lithium carbonate and sintered. At present, CoOOH is used in nickel-metal hydride batteries to improve the conductivity of nickel hydroxide, and can also be directly used as anode materials for lithium-ion batteries and electrode materials for supercapacitors. However, there is no report on its catalytic performance in lithium-air batteries. [0003] Li-air batteries have up to 11428Wh kg -1 The theoretical energy is not only much higher than all kinds of commonly used or conceptual batteries, but also very close to the theoretic...

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
IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 陈云贵蔡生容朱丁黄利武王晓飞母仕佳张开放
Owner SICHUAN UNIV
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