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Lithium-air battery cathode bifunctional catalyst and application thereof

A bifunctional catalyst and lithium-air battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large electrode polarization, poor kinetic performance, and low battery charge and discharge efficiency, and achieve long cycle life and low cost. low effect

Inactive Publication Date: 2013-08-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem in the use of lithium-air batteries with organic electrolyte systems is: the Li generated during the discharge process 2 o 2 or Li 2 O oxides will be deposited on the surface of the catalyst so that oxygen can no longer directly contact the catalyst, resulting in the slowing down or even termination of the oxygen reduction reaction; Li 2 o 2 or Li 2 The conductivity of O oxide is relatively poor, and the electrode polarization is large; the kinetics of the oxygen reduction reaction during discharge and the oxygen evolution reaction during charging are poor, and the battery charge and discharge efficiency is low; the cycle performance is poor, etc.
[0006] The Yang Shao-Horn research group of MIT has done a lot of work in this area and developed a PtAu alloy dual-functional catalytic system. The research shows that Au exhibits high catalytic activity for oxygen reduction reaction, while Pt has relatively high catalytic activity for oxygen evolution reaction. High sensitivity; although noble metals such as Pt and Au have shown excellent catalytic effects, due to their high price and scarce resources, it is difficult to apply them on a large scale in the commercial field

Method used

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  • Lithium-air battery cathode bifunctional catalyst and application thereof
  • Lithium-air battery cathode bifunctional catalyst and application thereof
  • Lithium-air battery cathode bifunctional catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: solid-phase synthesis method prepares Ba 0.9 co 0.7 Fe 0.2 Nb 0.1 o 3 (BCFN)

[0031] Weigh 0.1800mol BaCO according to the stoichiometric ratio 3 , 0.0467mol Co 3 o 4 , 0.0200mol Fe 2 o 3 and 0.0100mol Nb 2 o 5 Put it in an agate spheroidal ink tank, mill it in a planetary ball mill for 24 hours, then press it into a tablet, and then put it in a box furnace at 1000 ° C for 24 hours, and then crush it to obtain Ba 0.9 co 0.7 Fe 0.2 Nb 0.1 o 3 .

[0032] Ba 0.9 co 0.7 Fe 0.2 Nb0.1 o 3 The powder needs to be milled by a planetary ball mill for 48 hours and passed through a 100-mesh sieve before making electrode slurry.

[0033] attached figure 2 for the above Ba 0.9 co 0.7 Fe 0.2 Nb 0.1 o 3 Catalytic activity diagram of the catalyst for the oxygen reduction reaction. It can be seen from the diagram that Ba 0.9 co 0.7 Fe 0.2 Nb 0.1 o 3 The limiting diffusion current density for the oxygen reduction reaction can reach 5.80 mA cm...

Embodiment 2

[0037] Embodiment 2: Sol-gel method prepares Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 (BSCF)

[0038] Weigh 0.05mol Ba(NO 3 ) 2 , 0.05 mol Sr(NO 3 ) 2 , 0.08 mol Co(NO 3 ) 2 ·6H 2 O and 0.02mol Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water, and 1 mol / L of EDTA-NH 3 Buffer solution, stirred magnetically for 2 hours at room temperature to fully coordinate EDTA and metal ions, then added citric acid with 1.5 times the total molar number of metal ions as a gelling agent, stirred vigorously, and adjusted the pH of the solution to about 6.0 with ammonia water. The above solution was evaporated in a water bath at 80° C. until a sol was formed, and the obtained sol was dried at 200° C. for 24 hours to obtain a dark brown xerogel. The xerogel was calcined at 800 °C for 4 h to obtain black Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 powder.

[0039] attached Image 6 To utilize the above Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 Catalytic activity diagram of the catalyst for the oxyge...

Embodiment 3

[0041] Embodiment 3: Glycine nitrate combustion method prepares La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3

[0042] Weigh 0.06mol La(NO 3 ) 3 9H 2 O, 0.04mol Sr(NO 3 ) 2 , 0.02mol Co(NO 3 ) 3 ·6H 2 O and 0.08mol Fe(NO 3 ) 3 9H 2 O was dissolved in 500ml of deionized water, and then 0.24mol of glycine was added. After the glycine and metal ions fully formed complexes, the mixture was rapidly heated and concentrated until it burned violently to obtain a powdery precursor. After fully grinding the precursor, it was calcined at 800 °C for 4 h to obtain La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 .

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Abstract

The invention discloses a lithium-air battery cathode bifunctional catalyst and application thereof. The catalyst is a compound with a perovskite crystal structure and particularly is Ba0.9Co0.7Fe0.2Nb0.1O3, La0.6Sr0.4Co0.2Fe0.8O3, Pr0.4Sr0.6Co0.2Fe0.7Nb0.1O3 or Ba0.5Sr0.5Co0.8Fe0.2O3. The lithium-air battery cathode bifunctional catalyst can be used for obviously reducing the charge / discharge polarization of a battery and achieving high charge / discharge capacity, has excellent charge / discharge multiplying power and long cycle life, can be used for obviously reducing the production cost, and has excellent catalytic efficiency. A lithium-air battery containing the catalyst has the advantage of high energy density and is applicable to the fields of various mobile electronic equipment and electric batteries.

Description

technical field [0001] The invention relates to a battery material, in particular to a lithium-air battery cathode dual-function catalyst, which belongs to the field of high-performance chemical power source electrocatalysts. Background technique [0002] Due to the rapid development of space technology, mobile communications, missiles, aerospace and other fields, as well as modern people's concern about energy crisis and environmental protection, the research and development of high energy storage batteries have attracted widespread attention. Since lithium has the smallest mass and the lowest electrode potential among all metal elements, batteries composed of lithium have the characteristics of high open circuit voltage and large mass specific capacity. In recent years, they have rapidly replaced nickel-cadmium and nickel-hydrogen batteries and become the most popular high-energy battery. Battery. [0003] Lithium-air battery is a battery that uses oxygen as the positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 金超杨瑞枝卞伟勇
Owner SUZHOU UNIV
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