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Novel conductive agent for lithium-sulfur primary battery and preparation method of novel conductive agent

A conductive agent and battery technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of battery energy density reduction and achieve high conductivity, high conductivity, and high conductivity

Inactive Publication Date: 2019-03-26
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of conductive agent for lithium-sulfur primary batteries and its preparation method in view of the problem that the addition of common commercial conductive agents such as conductive carbon black will lead to a decrease in battery energy density

Method used

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  • Novel conductive agent for lithium-sulfur primary battery and preparation method of novel conductive agent
  • Novel conductive agent for lithium-sulfur primary battery and preparation method of novel conductive agent
  • Novel conductive agent for lithium-sulfur primary battery and preparation method of novel conductive agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] First, 1 g of 3,4-dioxyethylthiophene (EDOT) monomer was added to 50 mL of deionized water,

[0029] 3000 rpm, under the condition of stirring at room temperature, then add 0.2g conductive carbon black to obtain a mixed solution, then continue to stir, add 0.2g acetonitrile to the mixed solution after 20 minutes, then add 0.5g ammonium persulfate, ultrasonic 10 minutes, and stirred at 50°C for 10 minutes, and finally collected the black precipitate, washed three times with deionized water, and dried in an oven at 60°C as a conductive agent for lithium-sulfur primary batteries.

[0030] Then, place the sulfur electrode and the conductive agent and binder prepared in this example in a mortar in a mass ratio of 8:1:1, grind and mix to form a slurry, and evenly scrape the slurry on the carbon-containing Dry on aluminum foil at 55° C. for 24 hours, and press into thin sheets using a tablet press under a pressure of 5 MPa to obtain a positive electrode sheet. The sulfur comp...

Embodiment 2

[0033] First, add 1.5g of 3,4-dioxyethylthiophene (EDOT) monomer into 100mL of deionized water, and then add 0.3g of conductive carbon black to obtain a mixed Solution, then continue to stir, after 22 minutes, add 0.3g of acetonitrile to the mixed solution, then add 0.75g of ammonium persulfate, ultrasonic for 10 minutes, and stir at 55°C for 10 minutes, finally collect the black precipitate, wash with deionized water 3 times Finally, it was dried in an oven at 60°C and used as a conductive agent for lithium-sulfur primary batteries.

[0034] Then, place the sulfur electrode and the conductive agent and binder prepared in this example in a mortar in a mass ratio of 8:1:1, grind and mix to form a slurry, and evenly scrape the slurry on the carbon-containing Dry on aluminum foil at 55° C. for 24 hours, and press into thin sheets using a tablet press under a pressure of 5 MPa to obtain a positive electrode sheet. The sulfur composite electrode or sulfur electrode is used as the ...

Embodiment 3

[0037] First, 2g of 3,4-dioxyethylthiophene (EDOT) monomer was added to 150mL of deionized water, and then 0.4g of conductive carbon black was added to obtain a mixed Solution, then continue to stir, after 25 minutes, add 0.4g of acetonitrile to the mixed solution, then add 1g of ammonium persulfate, ultrasonic for 10 minutes, and stir at 50°C for 10 minutes, finally collect the black precipitate, wash with deionized water 3 times , dried in an oven at 60°C, used as a conductive agent for lithium-sulfur primary batteries.

[0038] Then put the sulfur electrode and the conductive agent and binder prepared in this experiment in the mortar according to the mass ratio of 8:1:1, grind and mix to form a slurry, and evenly scrape the slurry on the carbon-containing aluminum foil, Dry at 55° C. for 24 hours, and press into a thin sheet using a tablet press under a pressure of 5 MPa to obtain a positive electrode sheet. The sulfur composite electrode or sulfur electrode is used as the...

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Abstract

The invention belongs to the technical field of lithium-sulfur primary batteries and specifically relates to a novel conductive agent for a lithium-sulfur primary battery and a preparation method of the novel conductive agent. The novel conductive agent for the lithium-sulfur primary battery is prepared by taking polyethylene dioxythiophene as a main body in combination with conductive carbon black. The energy density of the material cannot be reduced under the condition that the good electrical conductivity and high conductivity are kept, so that the problem that the energy density of the material is reduced by using an ordinary commercial conductive agent is favorably solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur primary batteries, and in particular relates to a novel conductive agent for lithium-sulfur primary batteries and a preparation method thereof. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode of the battery, and the theoretical discharge specific capacity of elemental sulfur [0003] It can reach 1675mAh / g, which is much higher than the commercially widely used lithium-ion batteries, so the sulfur cathode active material is currently the cathode material with the highest specific capacity. Lithium has the smallest relative atomic mass and the most negative standard electrode potential among metal elements. Therefore, lithium-sulfur batteries have high theoretical discharge voltage, high theoretical discharge specific capacity, and high theoretical specific energy, which is expected to meet the long-term developm...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M6/14
CPCH01M4/624H01M4/625H01M6/14
Inventor 张永光张俊凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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