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

A porous carbon material, air battery technology, applied in battery electrodes, fuel cell type half cells and secondary battery type half cells, circuits, etc. requirements, experimental conditions and other issues, to achieve the effect of promoting commercial application, improving space utilization, and shortening 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, 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
  • Nitrogen-doped porous carbon material for lithium-air battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared using nano-magnesium carbonate powder as a template. Accurately weigh 5g of glucose, add 15ml of water and stir until completely dissolved, then add 8g of citric acid and 5g of magnesium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in a vacuum at 80°C after the water is completely evaporated Dry for 24h. Then put the dried product into high temperature tube furnace for carbonization, the atmosphere is NH 3 , the gas flow rate is controlled at 20ml / min. After carbonization at 800°C for 2 hours, the nanoparticle / carbon composite was obtained, and an appropriate amount of 2M dilute hydrochloric acid was added to remove nano-magnesium carbonate. After filtration, vacuum drying at 80°C for 24 hours was obtained to obtain the nitrogen-doped carbon material.

[0034] The positive electrode material structure prepared in Example 1 ...

Embodiment 2

[0039] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared using nano-calcium carbonate as a template. Accurately weigh 5g of sucrose, add 2g of ethylenediamine into 10ml of water and stir until completely dispersed, then add 5g of calcium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in a vacuum at 80°C after the water is completely evaporated Dry for 24h. Then put the dried product into high temperature tube furnace for carbonization, N 2 Treat at 850℃ for 3h, change CO 2 Purging at 850°C for 1 hour to obtain the nanoparticle / carbon composite, then removing calcium carbonate with an appropriate amount of 2M dilute hydrochloric acid, filtering and drying in vacuum at 80°C for 24 hours to obtain the carbon material.

Embodiment 3

[0041] Commercialized SiO 2 Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared using sol as a template. Accurately weigh 5g of glucose, 1g of citric acid, add 15ml of water and stir until completely dissolved, then add 5g of SiO 2 The sol was mechanically stirred to completely disperse it, heated and mechanically stirred in a water bath at 80°C, and dried under vacuum at 80°C for 24 hours after the water was completely evaporated. Then put the dried product into a high-temperature tube furnace for carbonization, the atmosphere is ammonia, and the gas flow is controlled at 30ml / min. Nano-SiO was obtained by carbonization at 900°C for 3 hours 2 / carbon composite, plus an appropriate amount of 1M HF to remove SiO 2 , after filtration and vacuum drying at 80°C for 24 hours, the carbon material was obtained.

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Abstract

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode, wherein 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 specifically relates to a carbon material. The carbon material is doped with nitrogen and has hierarchical pore distribution. It is used in the positive electrode of lithium-air batteries 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. Although the current laboratory specific energy of lithium-ion batteries has reached 250Wh / kg, it is difficult to further increase the specific energy due to the further increase in the specific capacity of the cathode material. Moreover, the specific energy can be increased by increasing the charging voltage. Aggravating safety issues, it is imperative to develop new electrochemical energy storage systems. In the new energy storage system, lithium-air battery is a secondary batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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