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Nitrogen-doped porous carbon material used for anode of lithium-air cell

A porous carbon material and air battery technology, which is applied in battery electrodes, fuel cell-type 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 a wide range of choices

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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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with template method. Dissolve 6.16g resorcinol in 10mL deionized water to form a transparent solution; take 1g SiO 2 Add the sol to the above transparent solution, mix and dissolve evenly to obtain a solution; add dropwise 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; the gel Transfer to a vacuum drying oven, vacuum dry and age at 70°C for 7 days, take it out, crush and grind to obtain a solid powder; put the solid powder in NH 3 Treat at 850°C for 3 hours in the atmosphere, wash off SiO with 1M HF solution 2 , after filtering and drying, the carbon material is obtained.

[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 1 to 2 micron-sc...

Embodiment 2

[0040] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with template method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; add 2g of nickel hydroxide powder to the above transparent solution, mix and dissolve to obtain a uniform 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 Treat at 900℃ for 3h, 1M HNO 3 The solution is washed to remove nickel oxide, filtered and dried to obtain the carbon material.

Embodiment 3

[0042] Nitrogen-doped porous carbon materials with hierarchical pore structure were prepared by sol-gel method combined with template method. Dissolve 6.16g of resorcinol in 10mL of deionized water to form a transparent solution; take 4g of aluminum oxide powder and add it to the above transparent solution, mix and dissolve evenly to obtain a solution; add dropwise 9.08g of For the formaldehyde solution, stir and mix evenly, and continue to stir at 20°C until the reaction forms a gel; transfer the gel to a vacuum drying oven for 7 days of vacuum drying and aging treatment at 70°C, take it out, crush and grind it, and obtain a solid powder; Solid powder in NH 3 Treat at 800° C. for 5 hours, wash off Al2O3 with 2M HCl solution, and filter and dry to obtain the carbon material.

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Abstract

The invention relates to a nitrogen-doped porous carbon material used for anode of a lithium-air cell, which has a mutually communicated graded pore structure, N is uniformly doped in a C frame, wherein N accounts for 0.2-15% of carbon material, the graded pore comprises a mass transfer pore and a deposition pore, the pore volume of the deposition pore accounts for 40-95% of total pore volume, and the pore volume of the mass transfer pore accounts for 4-55% of total pore volume. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, so that lithium-air cell energy density and power density can be effectively increased. The nitrogen-doped porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the nitrogen doping mode is easy to realize.

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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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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