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
CN103855366AActive Publication Date: 2014-06-11DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2014-06-11

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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.
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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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