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Nitrogen-doped porous carbon material for lithium-air battery positive electrode

A technology of porous carbon materials and air batteries, which is applied in the direction of battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the unfavorable large-scale commercial preparation and application, and cannot meet the needs of lithium-air batteries. Requirements, high experimental conditions and other issues, to achieve the effect of promoting commercial applications, improving space utilization, and wide control range

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

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Problems solved by technology

However, the above-mentioned materials are not conducive to large-scale commercial preparation and application due to their complicated preparation methods, high cost, and high experimental conditions, and still cannot meet the material requirements of lithium-air batteries.

Method used

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  • Nitrogen-doped porous carbon material for lithium-air battery positive electrode
  • Nitrogen-doped porous carbon material for lithium-air battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with catalytic activation method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; add 0.29g of nickel nitrate hexahydrate to the above transparent solution, mix and dissolve evenly to obtain a solution; add dropwise 9.08g of formaldehyde to the above stirring solution The solution was further stirred and mixed evenly, and continuously stirred in an environment of 20°C until the reaction formed a gel; the gel was transferred to a vacuum drying oven for 7 days of vacuum drying and aging treatment at 70°C, and then crushed and ground to obtain a solid powder; the solid Powder in NH 3 Carbonize at 900°C for 3 hours, wash off the nickel oxide with an appropriate amount of 1M HCl, and filter and dry to obtain the carbon material.

[0036] The positive electrode material structure prepared in Example 1 has a large number of d...

Embodiment 2

[0041] Nitrogen-doped 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 0.808g of ferric nitrate to the above-mentioned transparent solution, mix and dissolve to obtain a uniform solution; add 9.08g of formaldehyde solution dropwise to the above-mentioned 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, crush and grind to obtain a solid powder; put the solid powder in NH 3 Carbonize at 1000°C for 5 hours, wash away the iron oxide with an appropriate amount of 1M HCl, filter and dry to obtain the carbon material.

Embodiment 3

[0043] Nitrogen-doped 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 0.2716g of cobalt nitrate hexahydrate to the above transparent solution, mix and dissolve to obtain a solution; add dropwise 9.08g of formaldehyde to the above stirring solution The solution was further stirred and mixed evenly, and continuously stirred in an environment of 20°C until the reaction formed a gel; the gel was transferred to a vacuum drying oven for 7 days of vacuum drying and aging treatment at 70°C, and then crushed and ground to obtain a solid powder; the solid Powder in NH 3 Carbonize at 900°C for 3 hours, wash off cobalt oxide with an appropriate amount of 1M HCl, and filter and dry to obtain the carbon material.

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Abstract

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. 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 energy density and the power density of the lithium-air battery can be effectively increased; 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 nitrogen doping manner is easily achieved.

Description

technical field [0001] The invention belongs to the field of energy storage batteries, and in particular relates to a carbon material doped with nitrogen and having hierarchical pore distribution, which is applied to the positive electrode of a lithium-air battery and has high energy density and power density. Background technique [0002] The rapid development of electric vehicles and mobile electronic devices urgently requires the development of batteries with higher energy density. At present, although the laboratory specific energy of lithium-ion batteries has reached 250Wh / kg, it is difficult to increase the specific energy due to the limitation of the further improvement of the specific capacity of the positive electrode material, and the way to increase the specific energy by increasing the charging voltage will be Aggravating the safety problem, it is imperative to develop a new electrochemical energy storage system. In the new energy storage system, the lithium-air...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCH01M4/8605H01M4/861H01M4/96H01M12/08H01M2004/8689
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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