Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of graphene/polythiophenes/sulfur composite anode material

A composite material and polythiophene technology, applied in the direction of battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of slow migration speed, deterioration of lithium-sulfur battery performance, and restrictions on the development of lithium-sulfur batteries, so as to improve electronic conductivity The effect of rate and ionic conductivity

Inactive Publication Date: 2016-06-01
钟玲珑
View PDF9 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon, known as the shuttle effect, reduces the availability of sulfur active species
At the same time insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the lithium negative electrode, which further deteriorates the performance of the lithium-sulfur battery; (3) the final product of the reaction, Li 2 S is also an electronic insulator and will be deposited on the sulfur electrode, while lithium ions migrate slowly in solid lithium sulfide, slowing down the electrochemical reaction kinetics; (4) sulfur and the final product Li 2 The density of S is different. When sulfur is lithiated, the volume expands by about 79%, which easily leads to Li 2 Pulverization of S, causing safety problems in lithium-sulfur batteries
The above deficiencies restrict the development of lithium-sulfur batteries, which is also a key issue that needs to be solved in current research on lithium-sulfur batteries.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of graphene/polythiophenes/sulfur composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Grind 10g of sodium sulfide and 50g of elemental sulfur in an agate mortar, then dissolve the mixture in distilled water to obtain an orange solution, add 10ml of TritonX-100 with a mass fraction of 1% to the above solution, and stir for 3 hours, then continuously Add concentrated hydrochloric acid with a mass concentration of 30%, stir for 3 hours, and gradually form a yellow suspension.

[0021] (2) Add 2g of graphite oxide into distilled water and sonicate for 30min to form a 1g / L graphene oxide solution, add the graphene oxide solution to the above yellow suspension, stir in a water bath at 70°C for 1h, centrifuge the obtained suspension, and wash with water. After freeze-drying, dark gray graphene oxysulfide composites were obtained.

[0022] (3) Add 2 L of potassium iodide solution with a concentration of 2 mol / L to the obtained graphene oxysulfide composite material, and then quickly add 0.4 L of hydrochloric acid with a mass concentration of 10%, seal it, an...

Embodiment 2

[0025] (1) Grind 50g of sodium sulfide and 50g of elemental sulfur in an agate mortar, then dissolve the mixture in distilled water to obtain an orange solution, add 1ml of TritonX-100 with a mass fraction of 1% to the above solution, stir for 3 hours, and then continuously add Concentrated hydrochloric acid with a mass concentration of 30% was stirred for 3 hours, and a yellow suspension was gradually formed.

[0026] (2) Add 1 g of graphite oxide into distilled water and sonicate for 30 min to form a 1 g / L graphene oxide solution, add the graphene oxide solution to the above yellow suspension, stir in a 70°C water bath for 1 h, centrifuge the obtained suspension, and wash with water. After freeze-drying, dark gray graphene oxysulfide composites were obtained.

[0027] (3) Add 5 L of potassium iodide solution with a concentration of 2 mol / L to the obtained graphene oxysulfide composite material, then quickly add 0.5 L of hydrochloric acid with a mass concentration of 10%, sea...

Embodiment 3

[0030] (1) Grind 10g of sodium sulfide and 20g of elemental sulfur in an agate mortar, then dissolve the mixture in distilled water to obtain an orange solution, add 1ml of TritonX-100 with a mass fraction of 1% to the above solution, stir for 3 hours, and then continuously add Concentrated hydrochloric acid with a mass concentration of 30% was stirred for 3 hours, and a yellow suspension was gradually formed.

[0031] (2) Add 1 g of graphite oxide into distilled water and sonicate for 30 min to form a 1 g / L graphene oxide solution, add the graphene oxide solution to the above yellow suspension, stir in a 70°C water bath for 1 h, centrifuge the obtained suspension, and wash with water. After freeze-drying, dark gray graphene oxysulfide composites were obtained.

[0032] (3) Add 2L of potassium iodide solution with a concentration of 2mol / L to the obtained graphene oxysulfide composite material, then quickly add 0.3L of hydrochloric acid with a mass concentration of 10%, seal i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical conductivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a graphene / polythiophenes / sulfur composite anode material. The preparation method comprises the following steps: (1) grinding sodium sulfide and elemental sulfur in proportion in an agate mortar, then dissolving the mixture into distilled water to obtain an orange solution, adding Triton X-100 into the solution, and adding concentrated hydrochloric acid to form a yellow suspension liquid; (2) adding graphite oxide into distilled water for ultrasonic treatment to obtain a graphene oxide solution, and adding the yellow suspension liquid to obtain a sulfur and graphene oxide composite material; (3) adding the obtained sulfur and graphene oxide composite material into a potassium iodide solution, and adding dilute hydrochloric acid to obtain a sulfur and graphene composite material; and (4) adding the obtained sulfur and graphene composite material into water for stirring, adding thiophene or derivative monomers thereof, and then adding an initiator to obtain the graphene / polythiophenes / sulfur composite material. Sulfur in the graphene / polythiophenes / sulfur composite material is wrapped by graphene and polythiophenes with flexibility, so that the dissolution of polysulfides in discharge products can be inhibited, and the volume expansion is relieved.

Description

technical field [0001] The invention belongs to the field of nanomaterial synthesis, and relates to a preparation method of a lithium-sulfur battery positive electrode material, in particular to a preparation method of a graphene / polythiophene / sulfur composite positive electrode material. Background technique [0002] A lithium-sulfur battery is a battery system in which metallic lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. Lithium-sulfur batteries have two discharge platforms (about 2.4V and 2.1V), but their electrochemical reaction mechanism is relatively complicated. Lithium-sulfur batteries have the advantages of high specific energy (2600Wh / kg), high specific capacity (1675mAh / g), and low cost, and are considered to be a promising new generation of batteries. However, at present, there are problems such as low utilization of active materials, low cycle life and poor safety, which seriously restrict the development of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/366H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 钟玲珑肖丽芳
Owner 钟玲珑