Sulfur-asphalt based/graphene composite material and preparation method and application thereof

A composite material and graphene technology, applied in the field of electrochemical energy storage, can solve problems such as restricting development, low product added value, and short battery cycle life

Active Publication Date: 2018-01-19
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, despite the high energy density of lithium-sulfur batteries, it cannot be ignored that there are many problems in lithium-sulfur secondary batteries: the growth of lithium dendrites, the dissolution of polysulfides, and the volume expansion during charging and discharging, which lead to battery Many problems, such as short cycle life and poor rate performance, restrict its further development.
my country is mainly rich in coal tar pitch and shale pitch resources, but the deep processing technology is relatively backward, the added value of the product is low, and the maximum value of the product cannot be achieved

Method used

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  • Sulfur-asphalt based/graphene composite material and preparation method and application thereof
  • Sulfur-asphalt based/graphene composite material and preparation method and application thereof
  • Sulfur-asphalt based/graphene composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0063] The specific experimental process is as follows: (1) Industrial solid asphalt was vacuum-dried at 120°C for 3 hours, and then 50.0 g of agate balls with a diameter of 1-1.3 cm were put into an agate ball mill jar containing 50 g of treated asphalt, and then The ball mill jar was placed on a planetary ball mill and ball milled at a speed of 650 rpm for 5 hours. Take out the agate ball with tweezers, and dry the solid sample at 70 °C for 48 hours; (2) Mix and impregnate the above-mentioned asphalt powder with KOH for 60 hours at 40 °C, and then The mixed sample was blown and dried for 48 hours at a temperature of 110 degrees Celsius; (3) The obtained solid material was activated in an argon atmosphere at 700 degrees Celsius for 8 hours, and then washed with 10% hydrochloric acid aqueous solution and deionized water to neutrality, Use a polypropylene bag (pore size 20 microns) to separate the solid from the liquid, and dry the resulting solid at 120 degrees Celsius for 6 h...

Embodiment 2

[0066] The specific experimental process is as follows: (1) The industrial solid asphalt was vacuum-dried at 120 degrees Celsius for 3 hours, and then 200g of zirconia balls with a diameter of 3-8mm and 40g of asphalt were sealed in a zirconia ball mill jar under the protection of argon. Then the ball mill jar was placed on a planetary ball mill and ball milled at a speed of 600 rpm for 4 hours. Take out the zirconia ball with tweezers, sieve the milled sample with an ultrasonic vibrating sieve, take a 20-mesh sample and dry it at 100 °C for 24 hours; (2) Mix 20 g of treated pitch with 5 g of graphene and solid 40 g Na 2 CO 3Stir after ultrasonic mixing. The ultrasonic frequency is 20 kHz, the power density is 800w, the time is 8 hours, the temperature is 40 degrees Celsius, and the stirring time is 24 hours. Polystyrene membrane (pore size 2 microns) is used to achieve solid-liquid separation, the solid remains in the bag, and the liquid is thrown out, pressed out, extrude...

Embodiment 3

[0070] The specific experimental process is as follows: (1) Take 100 g of liquid industrial pitch and dissolve it in N-N dimethylformamide, add the surfactant cetyltrimethylammonium chloride during the stirring process, and ultrasonicate for 5 hours at a frequency of 2000 Hz , with a power density of 800 watts, then mechanically stirred for 24 hours, and used a polystyrene membrane (pore size of 5 microns) for solid-liquid separation, and the obtained solid was dried at 120 degrees Celsius for 4 hours; (2) 50 g of the above-mentioned asphalt was mixed with 10 g of nitrogen-doped graphene was mixed, and dissolved in 300 milliliters of 80% by mass ZnCl in aqueous solution for high-speed shear mixing. The time is 2 hours, the temperature is 60 degrees Celsius, and the rotation speed is 2000 rpm. Polypropylene bag (pore size 5 microns) is used for solid-liquid separation. The solid remains in the bag and the liquid is thrown out; (3) The above solid is separated at 800 Activate wi...

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Abstract

The invention discloses a sulfur-asphalt based / graphene composite material and a preparation method and an application thereof. The preparation method is as follows: performing a series of modification and activation treatment on an asphalt based / graphene composite material for pore forming, and then filling sulfur to an inside of the asphalt based / graphene composite material and loading on a surface of the asphalt based / graphene composite material, a sulfur content being 30-80%, to obtain a lithium-sulfur battery material that still can keep long-time circulatory stability, high specific capacity and very low coulombic efficiency loss under high-current density charging and discharging. According to the sulfur-asphalt based / graphene composite material, the overall weight of the battery can be alleviated, and the specific capacitance and the mass specific energy of the battery are improved; and meanwhile, through a special pore structure distribution, while the sulfur loading amount isimproved, the influence of volume expansion in charging and discharging processes on the battery is reduced; the material disclosed by the invention not only has simple preparation and low cost, butalso has a carbon conversion rate up to 80% and completely can implement scale production; and moreover, the used raw materials basically are industrial wastes, so the purpose of resource regenerationis implemented, and the sulfur-asphalt based / graphene composite material is safe and environment-friendly.

Description

technical field [0001] The invention relates to a sulfur-pitch-based / graphene composite material and its preparation method and application, belonging to the technical field of electrochemical energy storage. Background technique [0002] Today, the available natural resources can no longer sustain the needs of the living industry for a long time, and the excessive exploitation and use of fossil fuels such as oil and coal have also caused increasing environmental pollution. The development of efficient and clean new energy storage materials has become a research focus. The development and utilization of clean energy such as solar energy, wind energy, and tidal energy have developed accordingly. However, these new energy sources cannot be widely used in people's daily lives, and must be converted through electrochemical energy storage systems. In a series of rechargeable battery applications, lithium-sulfur batteries are expected to become the next generation of new energy s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 王俊中成苗
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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