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A kind of porous carbon material for lithium-sulfur battery and its preparation and application

A porous carbon material and lithium-sulfur battery technology, which is applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems that cannot meet the needs of electric vehicle battery life, achieve improved sulfur fixation effects, improve overall performance, and improve The effect of conductivity

Active Publication Date: 2019-04-09
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 based on the "deintercalation" theory is currently less than 300mAh g -1 , the actual energy density is less than 200Whkg -1 , far from meeting people's demand for 500km battery life of electric vehicles

Method used

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  • A kind of porous carbon material for lithium-sulfur battery and its preparation and application
  • A kind of porous carbon material for lithium-sulfur battery and its preparation and application
  • A kind of porous carbon material for lithium-sulfur battery and its preparation and application

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 lithium-sulfur batteries and its preparation and application. The one-dimensional carbon material is used as a matrix, and carbon protrusions are grown in situ on the surface of the matrix, and carbon arrays are formed by the carbon protrusions on the surface of the matrix, and then the carbon arrays are formed. The exterior is covered with a porous carbon layer. This kind of "carbon array overlapping tube-in-tube structure" porous carbon material has sufficient raw materials, environmentally friendly process, controllable carbon material size, adjustable pore size, pore distribution, and porosity. As a cathode material for lithium-sulfur batteries, it has great advantages in terms of raw material utilization, 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 200Whkg -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 sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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