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Porous carbon material used for lithium-air cell anode

A porous carbon material, air battery technology, applied in battery electrodes, fuel cell type half cells and secondary battery type half cells, circuits, etc. Utilize the problems of space and the limited stacking thickness of discharge products to achieve the effect of improving space utilization, improving energy density and power density, 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, 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 used for lithium-air cell anode
  • Porous carbon material used for lithium-air cell anode
  • Porous carbon material used for lithium-air cell anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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 3g 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 dry at 80°C after the water is completely evaporated 24h. Then put the dried product into a high-temperature tube furnace for carbonization, the atmosphere is nitrogen, and the gas flow is controlled at 30ml / 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, it was vacuum-dried at 80°C for 24 hours, and a porous carbon material with a hierarchical pore structure was obtained.

[0045] The positive electrode material structure prepared in Example 1 has a lar...

Embodiment 2

[0050] SiO 2 The sol is used as a template to prepare porous carbon materials with hierarchical pore structure. Accurately weigh 5g of glucose, 0.2716g of cobalt nitrate hexahydrate, 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 nitrogen, 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 And the generated cobalt oxide is filtered and then vacuum-dried at 80°C for 24 hours to obtain a porous carbon material with a hierarchical pore structure.

Embodiment 3

[0052] Porous carbon materials with hierarchical pore structure were prepared using nano-calcium carbonate powder as a template. Accurately weigh 5g of glucose and 2g of nickel hydroxide, add 10ml of water and stir until completely dispersed, then add 3g 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 a high-temperature tube furnace for carbonization, the atmosphere is nitrogen, and the gas flow is controlled at 20ml / min. After carbonization at 900°C for 2 hours, the nanoparticle / carbon composite was obtained, and then the nano-calcium carbonate and nickel oxide were removed with an appropriate amount of 2M dilute hydrochloric acid. After filtration, it was vacuum-dried at 80°C for 24 hours to obtain a porous carbon material with a hierarchical pore structure.

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Abstract

The invention relates to an application of a porous carbon material with a grading pore structure in a lithium-air cell anode, and is characterized in that the carbon material has mutually communicated grading pore structure distribution which has a mesoporous structure for depositing the discharge products and a macroporous structure suitable for transmission of oxygen and an electrolyte. When the carbon material is taken as a material of the lithium-air cell anode, the space utilization rate of carbon material can be increased at maximum limitation during a charge and discharge process, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that the energy density and power density of the lithium-air cell can be increased. The porous carbon material has the advantages that the preparation technology is simple, the material source is wide, the grading pore carbon material pore structure enables regulation and control, the regulation and control modes are various, and the doping of metal / metal oxide can be easily and simultaneously realized.

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): H01M4/96H01M4/88C01B31/02C01B32/15C01B32/336C01B32/342C01B32/348
CPCY02E60/50C01B32/05H01M4/861H01M4/96H01M12/08H01M2004/8689
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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