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Sulfur-activated carbon/graphene composite material and application thereof

A composite material and graphene technology, applied in the field of electrochemical energy storage, can solve problems affecting battery cycle life, active material dissolution, etc.

Inactive Publication Date: 2017-03-22
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

Although the good conductivity of graphene can effectively improve the utilization rate of elemental sulfur, its large specific surface area leads to direct contact between sulfur and electrolyte, resulting in the dissolution of active substances.
Thus, the shuttle effect will affect the cycle life of the battery

Method used

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  • Sulfur-activated carbon/graphene composite material and application thereof
  • Sulfur-activated carbon/graphene composite material and application thereof
  • Sulfur-activated carbon/graphene composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] Example 1: (1) Dry the rice husks naturally for 14 days, then 50.0 g of agate balls with a diameter of 1-1.3 cm are ground, and 100 g of rice husks are sealed in an agate ball mill jar under the protection of argon, and then the ball mill jars Place it on a planetary ball mill and ball mill it at a speed of 580 rpm for 2 hours. The agate ball was taken out with tweezers, the ball-milled sample was sieved with a three-dimensional vibrating sieve, and the 20-mesh sample was washed three times with 5% sulfuric acid aqueous solution and deionized water respectively. Polyethylene membrane (0.2 microns in pore size) was used for solid-liquid separation, and the obtained solid was air-dried at 70 °C for 96 hours; (2) 20 g of treated rice husk, 100 g of graphene in 50 ml of 10% by mass KOH aqueous solution was stirred to mix. The time of magnetic stirring is 5 hours, and the temperature is 20 degrees Celsius. A polypropylene bag (pore size 0.2 microns) is used to achieve soli...

Embodiment 2

[0147] Example 2: (1) Date stones were dried naturally for 3 days, then 1500.0 g of zirconia balls with a diameter of 3-8 mm were milled, and 200 g of date stones were sealed in a zirconia ball mill jar under nitrogen protection, and then ball milled The jars were placed on a planetary ball mill and ball milled at 300 rpm for 30 hours. The zirconia balls were taken out with tweezers, the milled samples were sieved with an ultrasonic vibrating sieve, and the 50-mesh samples were washed three times with 5% hydrochloric acid aqueous solution and deionized water respectively. Polypropylene membrane (pore size 1 micron) was used for solid-liquid separation, and the obtained solid was air-dried at 100 °C for 24 hours; (2) 100 g of biomass and 10 g of nitrogen-doped graphene were mixed in 100 ml of 20% K 2 CO 3 Stir in the aqueous solution to mix. The time of mechanical stirring is 20 hours, and the temperature is 40 degrees Celsius. A polyethylene bag (pore size 1 micron) is used...

Embodiment 3

[0148] Example 3: (1) Bamboo powder was dried naturally for 30 days, then 500.0 g of aluminum oxide ball milling balls with a diameter of 8-15 mm, 300 g of bamboo powder were sealed in an agate ball mill jar under air protection, and then the ball mill jar Place on a planetary ball mill and ball mill for 60 hours at a speed of 100 rpm. The alumina balls were taken out with tweezers, the milled samples were sieved with an ultrasonic vibrating sieve, and the 80-mesh samples were washed three times with 30% hydrochloric acid aqueous solution and deionized water respectively. A polystyrene membrane (pore size of 2 microns) was used for solid-liquid separation, and the obtained solid was air-dried at 120 °C for 1 hour; (2) 2 g of biomass and 100 g of phosphorus-doped graphene were mixed in 300 ml of 50% by mass Ultrasonic mixing in aqueous NaOH. The ultrasonic frequency is 20 kilohertz, the power density is 500w, the time is 30 hours, and the temperature is 20 degrees Celsius. A ...

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Abstract

The invention discloses a sulfur-activated carbon / graphene composite material and an application thereof. The composite material is formed by loading sulfur on an activated carbon / graphene composite material or a material; and the sulfur-activated carbon / graphene composite material comprises the following components in percentage by mass: 10%-90% of sulfur and 10%-90% of activated carbon / graphene composite material. The sulfur-activated carbon / graphene composite material is used for a lithium-sulfur battery, so that, on one hand, the weight of the battery can be greatly reduced, the internal resistance of the battery is reduced, the conductivity of an electrode material is improved and the specific capacity and the overall performance of the battery are improved; and on the other hand, the shuttle effect is reduced, the influence of volume expansion of the sulfur on the performance of the battery is reduced to a certain extent and the utilization rate of the active material is improved. Under the same test condition, the overall performance of the lithium-sulfur battery assembled by the composite material as a positive electrode material is obviously superior to that of the lithium-sulfur battery assembled by the similar positive electrode material as the positive electrode material.

Description

technical field [0001] The invention relates to a sulfur-activated carbon / graphene composite material and its application, belonging to the field of electrochemical energy storage. Background technique [0002] With the rapid development of space technology, mobile communications, missiles, aerospace and other fields, as well as the increasing concern of modern people on energy crisis and environmental protection issues, the research and development of lithium secondary batteries with high energy density has aroused widespread interest ( Inorg. Chem. Front., 2015, 2, 1059). Lithium-sulfur batteries are considered to be one of the most promising new multi-electron reaction secondary battery systems. The theoretical specific capacity of elemental sulfur and lithium reaction is 1675 mAh g-1, and the mass specific energy reaches 2600 Wh kg-1, which is much higher than the current traditional lithium-ion secondary battery materials. At the same time, sulfur has the advantages o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M4/36H01M10/052C01B32/182
CPCH01M4/364H01M4/38H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 王俊中刘勇志张会念
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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