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Hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium air battery

A lithium-air battery and composite oxide technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problem of not being able to meet the requirements of industrialization of high-performance ether-based lithium-air batteries and unfavorable mass transfer of catalytically active air electrodes , Ether lithium-air battery performance degradation and other issues, to achieve superior cycle life, improve unit active area and life, and high practical value

Inactive Publication Date: 2015-04-08
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to realize its application, a series of problems need to be solved, such as low electrolyte stability, poor rate performance, poor cycle stability, etc., and the catalysts used in lithium-air batteries directly affect these properties
[0003]Currently reported catalysts with catalytic activity in ether electrolytes mainly include noble metals, pyrochlore oxides and Co3O4, etc., but these catalysts are all in the form of particles The like form is accumulated in the air electrode, which is not conducive to its catalytic activity and the mass transfer of the air electrode in the battery reaction, resulting in a decrease in the performance of the ether lithium-air battery.
Among them, noble metal catalysts also have the disadvantage of high cost
Therefore, the above-mentioned existing catalysts cannot meet the requirements of industrialization of high-performance ether-based lithium-air batteries.

Method used

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  • Hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium air battery
  • Hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium air battery
  • Hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium air battery

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Embodiment 1

[0029] A hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium-air battery, including the following steps:

[0030] A. Weigh the lanthanum salt and the nickel salt in a stoichiometric ratio of 2:1, dissolve them in 60 mL of deionized water, stir to form a mixed solution, and control the nickel salt concentration in the mixed solution to 0.0005 mol / L;

[0031] B. Add 0.002mol glycine dropwise to the mixed solution of step A;

[0032] C. Add a pH adjuster to the mixed solution with glycine added dropwise in step B and stir to adjust the pH to 7.6;

[0033] D. Airtightly heat the mixed solution of step C at 175°C for 14 hours to obtain a product;

[0034] E. Wash and dry the product of step D;

[0035] F. The product after the treatment in step E is sintered at a high temperature in an oxygen-rich atmosphere, and the temperature is raised to 600°C at a heating rate of 2°C / min, and then kept for 4 hours to obtain a lanthanum nickel composite oxide catalyst ...

Embodiment 2

[0046] A hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium-air battery, including the following steps:

[0047] A. Weigh lanthanum salt and nickel salt according to a stoichiometric ratio of 2:1, dissolve them in 70 mL of deionized water, stir to form a mixed solution, and control the concentration of nickel salt in the mixed solution to 0.001 mol / L;

[0048] B. Add 0.003mol glycine dropwise to the mixed solution of step A;

[0049] C. Add a pH adjuster to the mixed solution with glycine added dropwise in step B and stir to adjust the pH to 7.7;

[0050] D. Airtightly heat the mixed solution of step C at 180°C for 12 hours to obtain a product;

[0051] E. Wash and dry the product of step D;

[0052] F. The product processed in step E is sintered at a high temperature in an oxygen-rich atmosphere, and the temperature is raised to 650°C at a heating rate of 3°C / min, and then kept for 3 hours to obtain a lanthanum nickel composite oxide catalyst for li...

Embodiment 3

[0063] A hydrothermal preparation method of lanthanum-nickel composite oxide catalyst for lithium-air battery, including the following steps:

[0064] A. Weigh lanthanum salt and nickel salt according to a stoichiometric ratio of 2:1, dissolve them in 70 mL of deionized water, stir to form a mixed solution, and control the concentration of nickel salt in the mixed solution to 0.0011 mol / L;

[0065] B. Add 0.003mol glycine dropwise to the mixed solution of step A;

[0066] C. Add a pH adjuster to the mixed solution with glycine added dropwise in step B and stir to adjust the pH to 7.8;

[0067] D. Airtightly heat the mixed solution of step C at 179°C for 13 hours to obtain a product;

[0068] E. Wash and dry the product of step D;

[0069] F. The product processed in step E is sintered at a high temperature in an oxygen-rich atmosphere, and the temperature is raised to 680°C at a temperature increase rate of 3°C / min, and then kept for 3 hours to obtain a lanthanum nickel composite oxide c...

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Abstract

The invention relates to the technical field of catalysts for lithium air batteries, and particularly relates to a hydrothermal preparation method of a lanthanum-nickel composite oxide catalyst for a lithium air battery. The hydrothermal preparation method comprises the following steps: weighing lanthanum salt and nickel salt at the stoichiometric ratio of 2 to 1, and dissolving the lanthanum salt and the nickel salt into deionized water; dropwise adding 0.002-0.004 mol of glycine, adding a pH modifier and stirring; heating in an airtight way for 10-14h at temperature of 175-185 DEG C to obtain a product, washing the product and drying the obtained product; and sintering at high temperature in an oxygen-enriched atmosphere, so as to obtain the lanthanum-nickel composite oxide catalyst for the lithium air battery. The catalyst prepared by adopting the method is a La2NiO4 material with a cubic lattice structure, the size is uniform, the relative supporting property of the cubic lattice structure is high, and is not prone to lose, so that the unit active area of the catalyst is increased, and the service life of the catalyst is prolonged; the electrochemical testing also shows that the cycle life of the catalyst is excellent, the catalyst has the relatively high practical value, and can meet industrial requirements on high-performance ether-base lithium air batteries.

Description

technical field [0001] The invention relates to the technical field of catalysts for lithium-air batteries, in particular to a hydrothermal preparation method for a lanthanum-nickel composite oxide catalyst for lithium-air batteries. Background technique [0002] Lithium-air batteries have attracted extensive attention due to their high theoretical energy density. The advantage of the battery is that the active material oxygen of the positive electrode comes directly from the air and does not need to be stored inside the battery, which not only reduces the cost but also reduces the weight of the battery. However, in order to realize its application, a series of problems need to be solved, such as low electrolyte stability, poor rate performance, poor cycle stability, etc., and the catalysts used in lithium-air batteries directly affect these properties. [0003] The currently reported catalysts with catalytic activity in ether electrolytes mainly include noble metals, pyroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9016H01M2004/8689Y02E60/50
Inventor 魏中山屈德扬董一鸣张新河李中延郑新宇
Owner MCNAIR TECH