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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
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  • 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 in poor cycle stability of the battery
In order to truly realize the practical application of lithium-air batteries, it is necessary to solve the problems of low capacity, large polarization, and poor cycle performance.

Method used

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  • 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

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Experimental program
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Effect test

Embodiment 1

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

[0027] Weigh CoOOH, polyvinylidene fluoride, and conductive carbon black (SP) according to the percentages of 30%, 20%, and 50%, respectively, mix and grind CoOOH and SP in an agate mortar for 20 minutes to obtain a mixture, and 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 polyvinylidene fluoride, and make the SP and The cobalt oxyhydroxide is uniformly dispersed to obtain a slurry, and the obtained 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, cooled to room temperature, and then used in 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 c...

Embodiment 2

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

[0037]Weigh CoOOH, polyvinylidene fluoride, and conductive carbon black (SP) according to the percentages of 15%, 25%, and 60%, respectively, mix and grind CoOOH and SP in an agate mortar for 20 minutes to obtain a mixture, and 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 polyvinylidene fluoride, and make the SP and hydroxyl in the mixture Cobalt oxide is uniformly dispersed to obtain a slurry, and the slurry is ultrasonically dispersed for 30 minutes, and then the ultrasonically dispersed slurry is coated on carbon paper, and vacuum-dried at 120°C for 12 hours, cooled to room temperature, and pressed with a hydraulic press at a pressure of 12MPa Form an electrode sheet to obtain a lithium-air battery positive electrode with CoOOH as a catalyst, and the carbon material content on ...

Embodiment 3

[0041] Preparation of positive electrode for lithium air battery:

[0042] Weigh CoOOH, polyvinylidene fluoride, and porous carbon according to the percentages of 15%, 25%, and 60%, respectively, mix and grind CoOOH and porous carbon in an agate mortar for 20 minutes to obtain a mixture, and dissolve polyvinylidene fluoride in N -Methylpyrrolidone, and added dropwise to the mixture to obtain a slurry, the amount of N-methylpyrrolidone completely dissolves polyvinylidene fluoride, and makes the porous carbon and cobalt oxyhydroxide in the mixture Uniformly disperse the slurry, disperse the slurry ultrasonically for 30 minutes, then coat the uniformly dispersed slurry on the nickel foam, and dry it in vacuum at 120°C for 12h, cool to room temperature and press it with a hydraulic press at a pressure of 12MPa to form an electrode sheet, to obtain a lithium-air battery positive electrode with CoOOH as a catalyst, and the carbon material content on the electrode sheet is 0.8mg / cm ...

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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

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Application Information

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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
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