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Porous carbon materials for positive electrodes of lithium-air batteries

A porous carbon material, air battery technology, applied in battery electrodes, circuits, fuel cell type half cells and secondary battery type half cells, 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: 2016-07-13
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 materials for positive electrodes of lithium-air batteries
  • Porous carbon materials for positive electrodes of lithium-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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 2g of commercial 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 and grind to obtain a solid powder; put the solid powder in N 2 Treated at 900℃ for 3h, N 2 Purge to room temperature, 1M HF solution to wash away SiO 2 , that is, porous carbon materials with hierarchical pore structure.

[0030]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 ...

Embodiment 2

[0035] 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 and subjected to vacuum drying and aging treatment at 70°C for 5 days, and after taking it out, it was pulverized and ground to obtain a solid powder; the solid The powder was treated in Ar at 850°C for 3h, 1M HNO 3 The solution is washed to remove nickel oxide, filtered and dried to obtain the carbon material.

Embodiment 3

[0037] 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 in an environment of 20°C until the reaction forms a gel; transfer the gel to a vacuum drying oven for 2 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 N 2 Treat at 800° C. for 5 hours, wash away aluminum oxide with 2M HCl solution, and filter and dry to obtain the carbon material.

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Abstract

The invention relates to an application of a porous carbon material in a lithium-air cell, which is characterized in that the carbon material has a mutually communicated graded pore structure distribution, and the pore structure is a mesopore structure suitable for depositing discharge products and a macropore structure suitable for transmission of oxygen and an electrolyte. 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, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that lithium-air cell energy density and power density can be effectively increased. The 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 doping of metal and metal oxide is easy to realize.

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 Patents(China)
IPC IPC(8): H01M4/96C01B31/02C01B32/00C01B32/05
CPCC01B32/05H01M4/861H01M4/96H01M12/08
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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