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Carbon-supported noble metal oxide bifunctional catalyst and preparation method and application thereof

A technology of noble metal oxides and bifunctional catalysts, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, electrical components, battery electrodes, etc. good, poor rate performance, etc., to achieve the effect of improved bifunctional catalytic activity, stable cycle performance, and promotion of formation and decomposition

Active Publication Date: 2019-05-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as low cycle efficiency, poor rate performance, and poor cycle performance restrict the commercial application of lithium-oxygen batteries.

Method used

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  • Carbon-supported noble metal oxide bifunctional catalyst and preparation method and application thereof
  • Carbon-supported noble metal oxide bifunctional catalyst and preparation method and application thereof
  • Carbon-supported noble metal oxide bifunctional catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a carbon-supported noble metal oxide bifunctional catalyst, comprising the steps of:

[0039] (1) ultrasonically disperse 25 mg of carbon nanotubes (CNT) in 40 mL of deionized water;

[0040] (2) at room temperature, add 1mmol KMnO to the material obtained in step (1) 4 and 1 mmol CoSO 4 , after fully stirring, put it in a 50mL polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at 120°C for 5h;

[0041] (3) After naturally cooling the material obtained in step (2), carry out 9000rpm centrifugal washing to separate CoMnO x @CNT, then vacuum dried at 80°C for 10 hours to remove moisture;

[0042] (4) 30mg RuCl 3 Dissolve in 40mL deionized water, then add 100mg of the material obtained in step (3), and carry out ultrasonic dispersion for 30min;

[0043] (5) Add 1mol / L NaOH aqueous solution dropwise to the material obtained in step (4) to pH = 11, then stir at room temperature, and then place it in a 50mL polytetrafluo...

Embodiment 2

[0046]The carbon-supported noble metal oxide bifunctional catalyst prepared in Example 1, conductive acetylene black and binder LA132 (5000cp, 14.9%) were mixed in a mass ratio of 8:1:1, and then mixed with water and isopropanol. The homogeneous slurry was evenly coated on carbon cloth, and vacuum-dried at 90° C. for 12 hours to obtain a lithium-oxygen battery cathode sheet. The prepared lithium-oxygen battery cathode pole piece was assembled with a Li metal anode in an Ar-protected glove box to form a 2025 button battery, and the electrochemical performance was tested.

[0047] The lithium-oxygen battery prepared in this example is an experimental battery, which is used for the performance test of the following effect examples:

[0048] At a current density of 50mA g -1 , with a cut-off capacity of 500mAh g -1 The charge-discharge cycle curve below.

[0049] At a current density of 200mA g -1 , with a cut-off capacity of 500mAh g -1 The charge-discharge cycle curve below...

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Abstract

The invention discloses a carbon-supported noble metal oxide bifunctional catalyst and a preparation method and application thereof. The chemical expression of the carbon-supported noble metal oxide bifunctional catalyst is RuO<2> / CoMnO<x>@CNT; wherein Co is present in the form of Co<3>O<4>, Mn is present in the form of MnO<2>, and the content of Ru therein is 12 to 14% by weight. Through the invention, the problem that the cycle life of the lithium-oxygen battery is low caused by the unicity of the structural function of the cathode catalyst of the lithium-oxygen battery and the problems of poor charging and discharging efficiency, severe electrode polarization and bad cycle performance caused by incomplete deposition and decomposition of lithium peroxide in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-oxygen batteries, and in particular relates to a carbon-supported noble metal oxide bifunctional catalyst and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have been increasingly used in portable mobile devices and electric vehicles, as well as other energy storage systems. However, in order to realize the popularization of electric vehicles, the energy density of lithium-ion batteries is far from meeting the requirements. Compared with other new rechargeable batteries, the non-aqueous lithium-oxygen battery has the highest theoretical specific energy (3505Whkg -1 ), a single charge can supply an electric vehicle to travel more than 550km, so it has important research significance and broad development prospects. However, problems such as low cycle efficiency, poor rate performance, and poor cycle performance all restrict the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08
CPCY02E60/10
Inventor 孙世刚盛文佳黄令陈丽斌李君涛
Owner XIAMEN UNIV
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