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Sulfur-carbon positive pole material for lithium-sulfur secondary battery and preparation method of sulfur-carbon positive pole material

A lithium-sulfur secondary battery and cathode material technology, which is applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage battery electrodes, etc. Effects of conduction efficiency, bleed suppression, and electrical performance improvement

Active Publication Date: 2016-10-26
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniformity of the sulfur composite material formed by this composite method is very poor. Some sites have serious sulfur agglomeration, and some sites have loose or even no sulfur, and the distribution is very uneven.
Another problem with lithium-sulfur secondary batteries is that the molecule of sulfur is a hydrophobic group, which has poor dispersion in water, and the solvent for dissolving sulfur is not explosive (CS 2 ) is highly toxic (CCl 4 , toluene, benzene), and the dispersibility in absolute ethanol is acceptable, which makes it more difficult to prepare sulfur by chemical synthesis using solvent as the medium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing a sulfur-carbon cathode material for a lithium-sulfur secondary battery, comprising the following steps:

[0040] (1) Add 7.5g of poloxamer to 45g of absolute ethanol and warm to dissolve at 40°C for 30 minutes, then add 7.5g of thermosetting liquid phenolic resin to the transparent solution at room temperature at 20°C and stir to dissolve for 60 minutes to form solution I.

[0041](2) Add 1.05 mmol sodium thiosulfate and 2 mmol sodium sulfide to solution I and stir for 5 minutes according to the stoichiometric ratio, then add 3 mmol of dilute sulfuric acid with a molar concentration of 0.1mol / L and stir for 3 hours to form Sol II .

[0042] (3) Pour Sol II into a petri dish with a thickness of 1mm, place it in an oven at a constant temperature of 20°C for 12 hours, then stand at 90°C for 24 hours, and then bake it in a tube furnace at 500°C under the protection of argon. Coarse particles of sulfur-carbon cathode material are generated.

[0043]...

Embodiment 2

[0045] A method for preparing a sulfur-carbon cathode material for a lithium-sulfur secondary battery, comprising the following steps:

[0046] (1) Add 10 g of poloxamer to 90 g of absolute ethanol and warm to dissolve at 30°C for 60 minutes, then add 10 g of thermosetting liquid phenolic resin to the above transparent solution at room temperature at 30°C and stir to dissolve for 30 minutes to form solution I.

[0047] (2) Add 11 mmol sodium thiosulfate and 20 mmol sodium sulfide to solution I and stir for 5 minutes according to the stoichiometric ratio, then add 30 mmol of dilute sulfuric acid with a molar concentration of 1 mol / L and stir for 2 hours to form Sol II.

[0048] (3) Pour sol II into a petri dish with a thickness of 3mm, place it in an oven at a constant temperature of 30°C for 12 hours, then stand at 120°C for 24 hours, and then bake it in a tube furnace at 750°C under nitrogen protection to form Coarse particles of sulfur carbon cathode material.

[0049] (4) ...

Embodiment 3

[0051] A method for preparing a sulfur-carbon cathode material for a lithium-sulfur secondary battery, comprising the following steps:

[0052] (1) Add 7.2g of poloxamer to 60g of absolute ethanol and warm to dissolve at 40°C for 30 minutes, then add 6g of thermosetting liquid phenolic resin to the transparent solution at room temperature at 20°C and stir to dissolve for 60 minutes to form solution I.

[0053] (2) Add 1.15 mmol sodium thiosulfate and 2 mmol sodium sulfide to solution I and stir for 5 minutes according to the stoichiometric ratio, then add 3 mmol of dilute sulfuric acid with a molar concentration of 0.1mol / L and stir for 3 hours to form Sol II .

[0054] (3) Pour Sol II into a petri dish with a thickness of 1mm, place it in an oven at a constant temperature of 25°C for 12 hours, and then stand at 90°C for 24 hours, then bake it in a tube furnace at 600°C under the protection of argon Coarse particles of sulfur-carbon cathode material are generated.

[0055] (...

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Abstract

The invention discloses a sulfur-carbon positive pole material for a lithium-sulfur secondary battery and a preparation method of the sulfur-carbon positive pole material. The method comprises the following steps: (1) adding poloxamer into anhydrous ethanol, carrying out warm / thermal dissolving, adding thermosetting liquid-state phenol-formaldehyde resin into the transparent solution, and carrying out room-temperature stirred dissolving so as to prepare a solution I; (2) adding sodium thiosulfate and sodium sulfide into the solution I, carrying out stirring for a few minutes, then, adding dilute sulfuric acid, and carrying out a stirred reaction for a period of time so as to prepare sol II; (3) pouring the sol II into a culture dish, putting the culture dish into a baking oven, carrying out constant-temperature standing, and then, carrying out roasting in a tube type furnace so as to produce coarse granules of the sulfur-carbon positive pole material; (4) dispersing the coarse granules into fine granules of the sulfur-carbon positive pole material by a liquid-nitrogen ball milling method. A sulfur positive pole material prepared by a chemical synthesis method is uniformly formed in inside walls of mesoporous carbon, so that the volume expansion of sulfur and the loss of sulfur active substances in an electrolyte are effectively inhibited, the efficiency of electron conduction is increased, and the electric properties are improved.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials for lithium-ion secondary batteries, in particular to a sulfur-carbon cathode material for lithium-sulfur secondary batteries and a preparation method thereof. Background technique [0002] In order to alleviate the problem of energy shortage, sulfur materials have been discovered as one of the energy storage materials. At present, the popular energy storage methods of sulfur materials include sodium-sulfur batteries and lithium-sulfur secondary batteries. [0003] As a new member of the electrochemical energy family, sodium-sulfur batteries make up for the crisis caused by insufficient energy on the one hand, and on the other hand, because they do not emit any harmful substances, they will not cause environmental damage after use or scrap. Secondary pollution is a truly environmentally friendly new energy source. Sodium-sulfur batteries have unique advantages for energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 靳佳杨晓亮徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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