Graphene-platinum nano-composite catalyst for lithium air battery, and preparation method thereof

An empty battery and catalyst technology, applied in the field of electrochemistry, can solve problems such as large overvoltage, poor cycle performance, and obstacles to the application of lithium-air batteries

Inactive Publication Date: 2012-04-25
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, too much overvoltage, poor cycle performance, and poor high-current charge and discharge performance have become three major problems hindering the application of lithium-air batteries.

Method used

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  • Graphene-platinum nano-composite catalyst for lithium air battery, and preparation method thereof
  • Graphene-platinum nano-composite catalyst for lithium air battery, and preparation method thereof
  • Graphene-platinum nano-composite catalyst for lithium air battery, and preparation method thereof

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Embodiment

[0016] Example: When the graphene-platinum (RGO-Pt) nanocomposite catalyst is prepared by the liquid phase pulsed laser ablation technology (LP-PLA), the solid metal material platinum (Pt) is used as the laser ablation target, and the 355nm laser is powered by Nd : YAG (DCR-150, Spectra Physics) generated 1064nm base frequency after triple frequency, repetition frequency 10Hz, pulse width 10ns, energy density is about 3J / cm 2 , The ablation time is 15-60min. The dispersed graphene colloid was used as the liquid phase medium and placed in a 5 mL beaker. Fix the target in the beaker, perpendicular to the light path. The laser is focused on the target at the liquid surface, and the graphene dispersion colloid is stirred with a magnet during laser ablation.

[0017] HRTEM measurement shows the material structure of graphene-platinum (RGO-Pt) nanocomposite catalyst material (attached figure 1 ).

[0018] AFM measurement shows the surface morphology of the graphene-platinum (RGO-Pt) na...

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Abstract

The present invention belongs to the technical field of electrochemistry, specifically relates to a graphene-platinum (RGO-Pt) nano-composite catalyst for a lithium air battery, and a preparation method thereof. The nano-composite catalyst material is prepared by a liquid phase pulsed laser ablation technology (LP-PLA). With adopting the membrane electrode prepared by the composite catalyst for the lithium air battery anode material, the lithium air battery has good charge-discharge cycle reversibility, the charge-discharge over voltage is significantly decreased, and the reversible specific capacity under the current density of 100 mA/g is more than 4000 mAh/g. The membrane anode material based on the graphene-platinum (RGO-Pt) nano-composite catalyst has characteristics of good chemical stability, high specific capacity, excellent cycle performance and simple preparation method, and is applicable for the lithium air battery.

Description

Technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a graphene-platinum (RGO-Pt) nanocomposite catalyst material for lithium-air batteries and a preparation method thereof. Background technique [0002] Due to its very high energy density, lithium-air batteries have great potential to become a new generation of energy storage power sources in the future. A typical non-aqueous lithium-air battery includes a metal lithium negative electrode, an electrolyte formed by dissolving a lithium salt in an organic solvent, and a carbon material with a high specific surface area, a catalyst and a binder composed of O 2 Breathing electrode (positive). However, too much overvoltage, poor cycle performance, and poor high-current charge and discharge performance have become the three major problems that hinder the application of lithium-air batteries. Therefore, the design of cathode materials is of decisive significance for the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J37/34H01M4/92
CPCY02E60/50
Inventor 杨银李越生傅正文
Owner FUDAN UNIV
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