Lithium-sulfur secondary battery as well as preparation method and application thereof

A technology of lithium-sulfur secondary battery and conductive agent, which is applied in the direction of lithium storage battery, electrolyte storage battery manufacturing, battery electrode, etc. The effect of large-scale industrial production

Active Publication Date: 2020-12-18
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, one aspect of the present invention is to provide a lithium-sulfur secondary battery, which can overcome the problems of poor electrical conductivity and narrow ion transport channels in lithium-sulfur battery sulfur cathode materials.

Method used

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  • Lithium-sulfur secondary battery as well as preparation method and application thereof
  • Lithium-sulfur secondary battery as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0044] Preparation of bentonite / sulfur composite cathode material

[0045]Add 5g of bentonite to 50mL of 1M LiCl aqueous solution, stir at 60°C for 2h, filter, and wash the filter cake repeatedly with deionized water until no chloride ions exist in the washing liquid.

[0046] Add the washed filter cake to 500mL deionized water, stir for 1h to obtain a suspension with a mass fraction of 1wt%; heat the above suspension to 60°C, 3+ The ratio of / g bentonite, slowly add the polymerized hydroxyaluminum ion intercalation agent, stir while adding, continue to add the concentration of 1wt% cetyltrimethylammonium bromide aqueous solution, stirring while adding, after the cetyltrimethylammonium bromide aqueous solution is added, continue to stir at 60°C for 6h, then stand at room temperature for aging After 24 hours, filter, wash the filter cake repeatedly with deionized water until there is no chloride ion in the washing liquid, and dry at 105° C. to obtain bentonite modified by inte...

Embodiment 1

[0051] Take the bentonite / sulfur composite positive electrode material prepared above to obtain a sulfur content of 80%, and conduct it with the conductive agent (Super P conductive carbon black), binder (polyvinylidene fluoride (PVDF)) according to the mass ratio of 8:1:1 Prepare electrode slurry (80 parts of bentonite / sulfur composite material, 10 parts of conductive agent, 10 parts of binder), and then coat it on the aluminum foil current collector to prepare a sulfur loading capacity of 2 mg S / cm 2 the positive plate.

[0052] The battery assembly and testing conditions are as follows: the above-mentioned positive electrode is used as the positive electrode of the lithium-sulfur secondary battery, the lithium metal sheet is used as the negative electrode, and the electrolyte is 1M LiTFSI / DOL:DME (1:1)+2% LiNO 3 , the amount of electrolyte was 15 μL / mg S, and assembled into a CR2025 button cell in an argon-filled glove box.

[0053] Carry out constant current charge and di...

Embodiment 2

[0055] Compared with Example 1, the difference is that the sulfur content of the bentonite / sulfur composite positive electrode material is 85%, the conductive agent is Ketjen black, and the mixing mass ratio of the bentonite / sulfur composite positive electrode material, conductive agent and binder is different ,Specifically:

[0056] Take the bentonite / sulfur composite cathode material prepared above with a sulfur content of 85%, and prepare an electrode with a conductive agent (Ketjen Black) and a binder (polyvinylidene fluoride (PVDF)) in a mass ratio of 7:2:1 Slurry (70 parts of bentonite / sulfur composite material, 20 parts of conductive agent, 10 parts of binder), and then coated on the aluminum foil current collector, the prepared sulfur loading capacity is 2mg S / cm 2 the positive plate.

[0057] The battery assembly and testing conditions are as follows: the above-mentioned positive electrode is used as the positive electrode of the lithium-sulfur secondary battery, the...

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Abstract

The invention discloses a lithium-sulfur secondary battery as well as a preparation method and application thereof. The lithium-sulfur secondary battery is prepared from a bentonite / sulfur composite positive electrode material with an efficient ion channel and a conductive network structure, a conductive agent and a binder. The bentonite / sulfur composite positive electrode material with the efficient ion channel and the conductive network structure remarkably improves the sulfur loading capacity of the positive electrode of the lithium-sulfur secondary battery, promotes the transmission of ions / electrons in the positive electrode of the battery, and strengthens the electrochemical reaction kinetics in the positive electrode; therefore, the specific discharge capacity, the cycling stabilityand the rate capability of the lithium-sulfur secondary battery are effectively improved, and the lithium-sulfur secondary battery can be widely applied to various energy storage power supply systemsand has extremely high practical value.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a lithium-sulfur secondary battery and its preparation method and application. Background technique [0002] As electronic and communication devices are becoming smaller and lighter, the endurance performance requirements of electric vehicles are continuously increasing, and considering environmental issues and the depletion of oil resources, the necessity and demand for high energy density secondary batteries have become highly prominent. As a secondary battery system with extremely high theoretical energy density, lithium-sulfur secondary batteries using sulfur as the positive electrode active material have received great attention. [0003] The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh / kg, and sulfur resources are abundant, cheap, and environmentally friendly, so they are considered to be one of the most potential se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M4/38H01M10/058
CPCH01M4/38H01M4/624H01M4/625H01M10/052H01M10/058H01M2004/021H01M2004/028Y02E60/10Y02P70/50
Inventor 吴炼戴永强余越庞浩麦裕良廖兵
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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