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Nano carbon fiber membrane and preparation thereof, and application of nano carbon fiber membrane in positive electrode of lithium-air battery

A nano-carbon fiber and carbon fiber technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as insufficient space utilization of carbon powder, unreasonable pore size distribution, side reactions of binders, etc., to avoid electrode preparation process, easy The effect of large-scale production and high discharge platform voltage

Active Publication Date: 2016-02-10
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

Using commercialized KB-600 carbon powder as the positive electrode material of lithium-air batteries, its specific capacity can reach 3500mAh.g -1 However, due to its unreasonable pore size distribution, the space utilization of the carbon powder is insufficient, and the mesopores are completely blocked during the cycle, resulting in poor cycle performance
In addition, the use of binders during electrode preparation can cause side reactions that adversely affect stability.

Method used

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  • Nano carbon fiber membrane and preparation thereof, and application of nano carbon fiber membrane in positive electrode of lithium-air battery
  • Nano carbon fiber membrane and preparation thereof, and application of nano carbon fiber membrane in positive electrode of lithium-air battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Select polyacrylonitrile as the carbon source, dissolve a certain mass of polyacrylonitrile powder in N,N-dimethylformamide solution, wherein the mass fraction of polyacrylonitrile is 10%, stir at 70°C for 24h to fully Dissolved to obtain a clear and transparent solution. Then, 5 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and 10% relative humidity, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 300°C for 2h, then sintered at 1200°C for 2h under an argon atmosphere, and dried. Such as figure 1 The SEM image of the carbon nanofiber membrane material shown shows that it is made of interlaced carbon nanofibers, in which the diameter of the carbon nanofibers is about 200nm, and a rich macroporous structure is formed between the carbon fibers (the specific surface area is 200㎡.g -1 , with a...

Embodiment 2

[0032] Select polymethyl methacrylate as the carbon source, dissolve a certain mass of polymethyl methacrylate powder in N,N-dimethylformamide solution, wherein the mass fraction of polymethyl methacrylate is 15%, Stir at 50°C for 24h to fully dissolve to obtain a clear and transparent solution. Then, 10 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 15KV voltage, 25° C., and a relative humidity of 20%, and the distance between the needle tip of the syringe and the receiving plate was 5 cm. The obtained polymer fiber membrane was pre-oxidized in air at 250°C for 2h, then sintered at 1000°C for 1h under argon atmosphere, and dried. The diameter of carbon nanofibers in the obtained carbon nanofiber membrane is about 100nm, and abundant macroporous structures are formed between carbon fibers (the specific surface area is 400㎡.g -1 , with a total pore volume of 0.8cm 3 .g -1 ) figure 2 The lithium-air battery positive el...

Embodiment 3

[0034] Polylactic acid was selected as the carbon source, and a certain mass of polylactic acid powder was dissolved in anhydrous ethanolamine solution, wherein the mass fraction of polylactic acid was 20%, and stirred at 55°C for 12 hours to fully dissolve to obtain a clear and transparent solution. Then 15 mL of the above solution was placed in a syringe, and spinning was carried out under the conditions of 10KV voltage, 25° C., and a relative humidity of 15%, and the distance between the needle tip of the syringe and the receiving plate was 10 cm. The obtained polymer fiber membrane was pre-oxidized in air at 300°C for 3h, then sintered at 800°C for 2h under argon atmosphere, and dried. The diameter of carbon nanofibers in the obtained carbon nanofiber membrane is about 80nm, and abundant macroporous structures are formed between carbon fibers (the specific surface area is 500㎡.g -1 , with a total pore volume of 1.2cm 3 .g -1 ).

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Abstract

The invention discloses a nano carbon fiber membrane and a preparation thereof, and an application of the nano carbon fiber membrane in a positive electrode of a lithium-air battery. The nano carbon fiber membrane is prepared from a high-molecular polymer as a carbon source through an electrostatic spinning method; the diameter of a carbon fiber is 100 nm to 1,000 nm; the specific surface area is 30-1,000 m<2>*g<-1>; and the total pore volume is 0.2-2 cm<3>*g<-1>. A nano carbon fiber membrane material prepared by the preparation method has high discharge platform voltage and specific discharge capacity when applied to a positive active material of the lithium-air battery; the cycle performance of the nano carbon fiber membrane material is greatly superior to that of various commercialized carbon materials; and the nano carbon fiber membrane has the advantages of excellent preparation performance, simplicity in process, good process repeatability, low cost, environment-friendliness and the like.

Description

technical field [0001] The invention relates to a preparation method of a carbon material and its application, in particular to a nano-carbon fiber membrane material and its application on a positive electrode of a lithium-air battery. Background technique [0002] Energy and the environment are two major issues facing mankind in the 21st century. With the continuous development of economy and society, the human demand for energy is increasing day by day. It is estimated that by 2050, human demand for energy will double and triple by the end of this century. On the one hand, traditional fossil energy reserves are limited and cannot meet the needs of social development. On the other hand, excessive consumption of fossil energy has brought serious environmental problems. In order to solve the dual problems of energy shortage and environmental pollution, the development of renewable clean energy is very important. Among them, lithium-ion batteries lead the development of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96H01M4/88C01B31/02
CPCY02E60/50
Inventor 张华民聂红娇刘涛许驰张益宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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