Porous carbon material for lithium-sulfur battery and preparation method and application thereof

A porous carbon material and lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems that cannot meet the 500km battery life of electric vehicles, improve the sulfur fixation effect, and reduce particle size , The effect of excellent rate performance

Active Publication Date: 2017-03-29
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

[0002] Among commercialized secondary batteries, lithium-ion batteries are currently the secondary batteries with the highest energy density, but the theoretical specific capacity of lithium-ion batteries

Method used

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  • Porous carbon material for lithium-sulfur battery and preparation method and application thereof
  • Porous carbon material for lithium-sulfur battery and preparation method and application thereof
  • Porous carbon material for lithium-sulfur battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh 3g of carbon nanofibers (D=100-300nm) and place them in 300mL of concentrated nitric acid, stir and reflux at 120°C for 4h, cool, and wash until neutral to obtain acidified carbon nanofibers; weigh 0.2g of acidified carbon nanofibers and add to 160mL 1M H 2 SO 4 In the solution, ultrasonic 20 ~ 60min, after fully dispersed, add 146μL aniline and 234.3mg (NH 4 ) 2 S 2 o 8 , stirred in an ice-water bath for 24 hours to obtain carbon nanofiber materials with polyaniline arrays grown on the surface; weigh 110 mg of carbon nanofiber materials with polyaniline arrays grown on the surface and place them in a mixed solution of 160 mL of ethanol and 16 mL of water, under stirring conditions , add 2mL ammonia water and 1.36mL tetraethyl orthosilicate (TEOS) solution, stir for 24h, then add 0.8mL TEOS and 0.53mL octadecyltrimethylsilane (C 18 TMS) mixed solution, stirred for 24h, suction filtered, washed, and dried to obtain carbon nanofiber materials with polyaniline a...

Embodiment 2

[0059] The carbon nanofibers in Example 1 were changed to carbon nanotubes, and other steps were the same as in Example 1.

[0060] Under the discharge rate of 0.1C, the specific capacity of the first cycle discharge is 1133mA h g -1 , when the discharge rate is increased to 5C, the reversible discharge specific capacity remains 724mA h g -1 , when the discharge rate is adjusted to 0.5C, the specific capacity can be recovered to 822mA h g -1 , at 2C rate, after 100 cycles, the specific capacity is 688mA h g -1 , the capacity retention rate was 70.9%.

Embodiment 3

[0062] Weigh 3g of carbon nanotubes (D=100-300nm) and place them in 300mL of concentrated nitric acid, stir and reflux at 120°C for 4h, cool, and wash until neutral to obtain acidified carbon nanotubes; weigh 0.2g of acidified carbon nanotubes and add them to 160mL 1M H 2 SO 4 In the solution, ultrasonic 20 ~ 60min, after fully dispersed, add 146μL aniline and 234.3mg (NH 4 ) 2 S 2 o 8 , stirred in an ice-water bath for 24 hours to obtain carbon nanotubes with polyaniline arrays grown on the surface; weigh 300 mg of carbon nanotubes with polyaniline arrays grown on the surface and place them in 300 mL deionized water for ultrasonication for 1 hour, add 100 mg Tris, and then add 180 mg Dopamine, stirred for 24h, then added 200mg of sucrose, stirred for 24h. In an ultrasonically mixed solution,

[0063] Under the discharge rate of 0.1C, the specific capacity of the first cycle discharge is 1181mA h g -1 , at a discharge rate of 0.1C, the specific capacity of the first cyc...

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Abstract

The invention relates to a porous carbon material for a lithium-sulfur battery and a preparation method and application thereof. The preparation method of the porous carbon material comprises forming carbon bosses on the surface of a one-dimensional carbon material as a matrix in situ so that a carbon array is formed, and coating the carbon array with a porous carbon layer. The carbon array lap joint pipe-in-pipe structure utilizes sufficient porous carbon raw materials. The preparation method has eco-friendly processes. The porous carbon material has controllable sizes and adjustable pore size, pore distribution and porosity. The porous carbon material as a lithium-sulfur battery positive pole material has great advantages in a raw material utilization rate, conductivity and sulfur resistance, and has a good application prospect.

Description

technical field [0001] The invention relates to a carbon material for lithium-sulfur battery and its preparation and application. Background technique [0002] Among commercialized secondary batteries, lithium-ion batteries are currently the secondary batteries with the highest energy density, but the theoretical specific capacity of lithium-ion batteries based on the "deintercalation" theory is currently less than 300mAh g -1 , the actual energy density is less than 200Wh kg -1 , It is far from meeting people's demand for 500km battery life of electric vehicles. Lithium-sulfur battery, as a new electrochemical energy storage secondary battery, is different from the traditional lithium ion "deintercalation" material. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, which can release a high specific capacity. (1675mAh g -1 ), the theoretical specific energy is also as high as 2600Wh kg -1 , At the same time, the active substance sulf...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/052
CPCH01M4/663H01M10/052Y02E60/10
Inventor 张华民杨晓飞张洪章李先锋王美日晏娜周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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