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Composite catalyst of air electrode of lithium-air cell

A composite catalyst, lithium-air battery technology, applied in battery electrodes, fuel cell-type half-cells, primary battery-type half-cells, circuits, etc., can solve problems such as poor stability, poor stability performance, and large voltage polarization Achieve low charge-discharge polarization and cycle stability, improve dispersion and stability, and improve overall performance.

Active Publication Date: 2015-03-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems such as large polarization of charging and discharging voltage of actual lithium-air battery reaction, low cycle efficiency and poor stability, and the shortcomings of noble metal catalysts such as high catalytic activity but large dosage, high cost and poor stability, the first purpose of the present invention is to Obtain a catalyst for air electrodes that can greatly improve the performance of lithium-air batteries

Method used

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  • Composite catalyst of air electrode of lithium-air cell
  • Composite catalyst of air electrode of lithium-air cell
  • Composite catalyst of air electrode of lithium-air cell

Examples

Experimental program
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Embodiment 1

[0098] with HAuCl 4 As a precursor, the CeO obtained in Comparative Example 3 2 Nanocrystalline (diameter 4nm, specific surface area 180m 2 / g) dispersed in water to form a sol, adjust the pH to 10, so that Au can be loaded on CeO in situ 2 On nanocrystals, a composite catalyst (Au / CeO 2 ). Among them, Au is the metal catalyst, and CeO 2 Nanocrystals are the support. figure 1 Be the support body CeO of comparative example 3 2 And the metal catalyst Au of the present embodiment is on the support body CeO 2 Composite catalyst Au / CeO obtained after in situ loading 2 The X-ray diffraction pattern, see figure 1 It can be seen that Au has been loaded to CeO 2 on nanocrystals. figure 2 The support body CeO obtained for Comparative Example 3 2 And the composite catalyst Au / CeO in the present embodiment 2 The transmission electron microscope pictures, see figure 2 It can be seen that the morphology of Au is about 3nm particles, and the loading amount is 3wt%. image 3 F...

Embodiment 2

[0100] with HAuCl 4 For the precursor, the Y obtained in Comparative Example 4 2 o 3 Nanocrystalline (diameter 6nm, specific surface area 70m 2 / g) is dispersed in the sol formed by water, and the pH is adjusted to 10, so that Au can be loaded on Y in situ 2 o 3 On the nanocrystal, the composite catalyst (Au / Y 2 o 3 ). where Au is the metal catalyst, and Y 2 o 3 Nanocrystals are the support. The morphology of Au is about 5nm particles, and the loading amount is 2.5wt%. in Au / Y 2 o 3 As a catalyst, acetylene black and polyvinylidene fluoride (PVDF) are in a mass ratio of 19:11:15, in the method of Comparative Example 1, and the battery assembly and test conditions are the same as those of Comparative Example 1. The measurement results are shown in Table 1. As can be seen from the data in Table 1, compared with Comparative Example 1, Comparative Example 2 and Comparative Example 4, containing the composite catalyst Au / Y 2 o 3 The air electrode (Au accounts for 1.0...

Embodiment 3

[0102] with HAuCl 4 As a precursor, the TiO obtained in Comparative Example 5 2 (Degussa P25, diameter 25nm, specific surface area 55m 2 / g) in the dispersion solution, adjust the pH to 9, so that Au can be loaded on TiO in situ 2 On (Au / TiO 2 ). Among them, Au is the metal catalyst, and TiO 2 Nanocrystals are the support. The morphology of Au is about 4nm particles, and the loading amount is 1.5wt%. With Au / TiO 2 As a catalyst, acetylene black and polyvinylidene fluoride (PVDF) are in a mass ratio of 19:11:15, in the method of Comparative Example 1, and the battery assembly and test conditions are the same as those of Comparative Example 1. The measurement results are shown in Table 1. As can be seen from the data in Table 1, compared with Comparative Example 1, Comparative Example 2 and Comparative Example 5, containing the composite catalyst Au / TiO 2 The air electrode (Au accounts for 0.63wt% of the total) makes the lithium-air battery have a non-catalytic electrod...

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Abstract

The invention relates to a composite catalyst of an air electrode of a lithium-air cell. The composite catalyst comprises a metal catalyst, and a support for performing synergic catalysis with the metal catalyst. The metal catalyst is uniformly distributed on the surface of the support via in-situ loading. The metal catalyst accounts for 0.01 wt%-99.9 wt% of the composite catalyst, preferably 0.1 wt%-60 wt%, and more preferably 0.5 wt%-5 wt%. By utilizing the metal catalyst and the support with synergic effect on the metal catalyst, the composite catalyst of the air electrode is formed, the dispersibility and the stability of the original metal catalyst are improved, and also the catalytic activity not owned or unreached by the single metal catalyst is induced to generate.

Description

Technical field [0001] The invention relates to a type of catalyst that can be used for air electrodes of lithium-air batteries, and belongs to the field of chemical power sources. Background technique [0002] Regardless of the development of portable electronic products or electric vehicles, there is an urgent need for an energy storage battery that is thinner and lighter than the existing battery system and has higher energy density to support it. Currently used lithium-ion batteries have low specific capacity due to their structural limitations, and there is limited room for further improvement. Therefore, new battery systems must be found as alternatives. Lithium-air batteries are a strong candidate. The positive active material is oxygen, which does not need to be stored in the battery. It is directly provided by the air in the environment during the discharge process, reducing the total mass of the battery system and thus increasing the energy density. Its theoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041H01M12/06
Inventor 温兆银崔言明沈忱鹿燕靳俊吴相伟张敬超
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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