Preparation method of graphene/poly-anthraquinone thioether/sulphur composite cathode material

A composite cathode material, polyanthraquinone sulfide technology, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve problems such as slow migration speed, safety problems of lithium-sulfur batteries, and deterioration of lithium-sulfur battery performance. The effect of improving electronic conductivity and ionic conductivity

Inactive Publication Date: 2016-06-22
钟玲珑
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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

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  • Preparation method of graphene/poly-anthraquinone thioether/sulphur composite cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (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 fraction of 30%, stir for 3 hours, and gradually form a yellow suspension.

[0019] (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.

[0020] (3) Add 2 L of potassium iodide solution with a concentration of 2 mol / L to the obtained graphene oxysulfide composite material, then quickly add 0.4 L of hydrochloric acid with a mass fraction of 10%, seal it, and move it to a...

Embodiment 2

[0023] (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 The mass fraction is 30% concentrated hydrochloric acid, and after stirring for 3 hours, a yellow suspension is gradually formed.

[0024] (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.

[0025] (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 fraction of 10%, seal it, and ...

Embodiment 3

[0028] (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 The mass fraction is 30% concentrated hydrochloric acid, and after stirring for 3 hours, a yellow suspension is gradually formed.

[0029] (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.

[0030] (3) Add 2 L of potassium iodide solution with a concentration of 2 mol / L to the obtained graphene oxysulfide composite material, then quickly add 0.3 L of hydrochloric acid with a mass fraction of 10%, seal it, and ...

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Abstract

The invention provides a preparation method of a graphene/poly-anthraquinone thioether/sulphur composite cathode material. The preparation method comprises the following steps: (1) dissolving sodium sulfide and elemental sulfur into distilled water to obtain an orange solution, adding Triton X-100, adding concentrated hydrochloric acid and gradually forming a yellow suspension liquid; (2) adding graphite oxide to the distilled water for ultrasonic treatment, obtaining a graphene oxide solution and adding the yellow suspension liquid to obtain dark grey sulfur graphene oxide; (3) adding a potassium iodide solution to the obtained sulfur graphene oxide composite material, and adding diluted hydrochloric acid to obtain a sulfur graphene composite material; and (4) adding the obtained sulfur graphene composite material to N-methylpyrrolidone for stirring, adding 1,5-dichloroanthraquinone for stirring, and then adding anhydrous sodium sulfide to obtain the poly-anthraquinone thioether/graphene/sulphur composite material. The sulphur in the composite material is coated with flexible graphene and poly-anthraquinone thioether, so that dissolution of a discharge product polysulfide can be inhibited; and 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 / polyanthraquinone sulfide / 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 de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/366H01M10/052Y02E60/10
Inventor 钟玲珑肖丽芳
Owner 钟玲珑
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