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Porous carbon material for lithium-air battery positive electrode

A technology of porous carbon materials and air batteries, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problem of not being able to fully utilize the space of the pores and the central part of the large pores. To improve the space utilization rate, increase the energy density and power density, and shorten the diffusion distance

Active Publication Date: 2014-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the discharge process of carbon materials composed entirely of macropore sizes, due to the poor conductivity of lithium oxide, the accumulation thickness of discharge products on the pore walls is limited, and the central part of the macropores cannot be utilized, nor can the pores be fully exploited. use of space

Method used

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  • Porous carbon material for lithium-air battery positive electrode
  • Porous carbon material for lithium-air battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with activation method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; add 9.08g of formaldehyde solution and 0.808g of ferric nitrate to the stirring solution, stir and mix evenly, and continue to stir in an environment of 20°C until The reaction forms a gel; transfer the gel to a vacuum drying oven for 3 days of vacuum drying and aging treatment at 70°C, take it out and grind it to obtain a solid powder; put the solid powder in N 2 Treat at 850°C for 2 hours, wash off the iron oxide with an appropriate amount of 2M hydrochloric acid, and filter and dry to obtain the carbon material.

[0035] The positive electrode material structure prepared in Example 1 has a large number of deposition pores with a diameter of 10 to 40 nanometers, and graded pores with mass transfer pores of 0.1 to 0.5 microns. The distance between the mass transfe...

Embodiment 2

[0040] Porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with activation method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; add 9.08g of formaldehyde solution to the above stirring solution, stir and mix evenly, and continue stirring at 20°C until the reaction forms a gel; Transfer the gel to a vacuum drying oven for 3 days of vacuum drying and aging treatment at 70°C, take it out and grind it to obtain a solid powder; put the solid powder in N 2 After being treated at 850°C for 2 hours, it was purged to room temperature, and then the carbon material was activated by water vapor. The activation temperature was 800°C, the activation time was controlled at 30 minutes, and the water vapor intake flow rate was controlled at 20ml / min; that is, the hierarchical pore structure is porous. carbon material.

Embodiment 3

[0042] Porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with activation method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; add dropwise 9.08g of formaldehyde solution to the stirring solution, stir and mix evenly, and continue stirring at 20°C until the reaction forms a gel ; transfer the gel to a vacuum drying oven for 4 days of vacuum drying and aging treatment at 70 ° C, take it out and grind it to obtain a solid powder; put the solid powder in N 2 Treat at 800℃ for 2h, change CO 2 Purge at 800°C for 1h, then change to N 2 Purge to room temperature, that is, a porous carbon material with hierarchical pore structure.

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Abstract

The present invention relates to an application of a graded pore structure porous carbon material in a lithium-air battery. The porous carbon material is characterized in that the porous carbon material has interconnected graded pore structure distribution, wherein the interconnected graded pore structure distribution comprises a mesopore structure for discharge product deposition and a macropore structure for oxygen and electrolyte transmission. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the discharge specific capacity, the voltage platform and the rate discharge capability of the battery can be effectively increased so as to increase the energy density and the power density of the lithium-air battery; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the metal / metal oxide doping can be concurrently and easily achieved.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, and in particular relates to a positive electrode material for lithium-air batteries. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. A lithium-air battery is a secondary battery that uses metallic lithium as the negative electrode and an air electrode as the positive electrode. Metal lithium as the negative electrode material has the lowest theoretical voltage, and its theoretical specific capacity is as high as 3,862mAh / g, while oxygen as the positive electrode active material can be obtained directly from the air. Therefore, lithium-air batteries have extremely high specific capacity and specific capacity. energy. Taking lithium as the standard, its theoretical specific energy density can reach 11,140Wh / Kg, and its actual specific energy is much higher t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/8605H01M4/861H01M4/96H01M12/08
Inventor 张华民李婧张益宁王美日聂红娇周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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