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Battery positive electrode, preparation method thereof and application in lithium-sulfur battery

A battery cathode and cathode active material technology, applied in battery electrodes, electrode carriers/collectors, non-aqueous electrolyte battery electrodes, etc., can solve the problem that the utilization rate of active materials and battery cycle characteristics cannot meet commercial applications and limit the size of lithium-sulfur batteries. Large-scale application and other issues, to achieve the effect of high active material sulfur utilization rate, excellent cycle performance, and high conductivity

Active Publication Date: 2016-08-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the existing lithium-sulfur battery cathodes and corresponding lithium-sulfur batteries cannot meet the requirements of commercial applications in terms of active material utilization and battery cycle characteristics, which limits the large-scale application of lithium-sulfur batteries.

Method used

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  • Battery positive electrode, preparation method thereof and application in lithium-sulfur battery
  • Battery positive electrode, preparation method thereof and application in lithium-sulfur battery
  • Battery positive electrode, preparation method thereof and application in lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Put 20 parts by mass of expanded graphite (obtained by treating expandable graphite in a tube furnace under air atmosphere at 800°C for 10 seconds, the same below) into a beaker filled with 100 mL of deionized water, and ultrasonically for 5 hours to obtain carbon Base material dispersion; mix and disperse 80 parts by mass of sulfur and 80 parts by mass of sodium sulfide in 100 mL of deionized water, add 10 mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; Slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, sonicate for 1 h, then add 10 mL of concentrated hydrochloric acid (commercially available concentrated hydrochloric acid), and magnetically stir for 1 h at room temperature to obtain the expanded graphite-polysulfide mixture; In the process, the expanded graphite-polysulfide mixture was stirred in a water bath at 70°C for 1 hour, then vacuum filtered, dried in a vacuum oven at 60°C, and then heat-treated in a vacuum ...

Embodiment 2

[0044] Put 25 parts by mass of expanded graphite into a beaker filled with 100 mL of deionized water, and ultrasonicate for 5 hours to obtain a carbon-based material dispersion; mix and disperse 75 parts by mass of sulfur and 75 parts by mass of sodium sulfide in 100 mL of deionized water, Add 10mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; under ultrasonication, slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, ultrasonicate for 1h, then add 10mL of concentrated hydrochloric acid, Stir magnetically for 1 hour to obtain the expanded graphite-polysulfide mixture; in a fume hood, stir the expanded graphite-polysulfide mixture in a water bath at 70°C for 1 hour, then vacuum filter, dry in a vacuum oven at 60°C, and then Heat treatment in a vacuum oven at 155° C. for 2 hours to obtain an expanded graphite-sulfur composite material.

[0045] The same procedure as described in Example 1 was followed to prepare the positive ele...

Embodiment 3

[0047] Put 33 parts by mass of expanded graphite into a beaker filled with 100 mL of deionized water, and ultrasonicate for 5 hours to obtain a carbon-based material dispersion; mix and disperse 66 parts by mass of sulfur and 66 parts by mass of sodium sulfide in 100 mL of deionized water, Add 10mL of 1% surfactant TX100 to obtain a yellow polysulfide dispersion; under ultrasonication, slowly add the yellow polysulfide dispersion into the expanded graphite dispersion, ultrasonicate for 1h, then add 10mL of concentrated hydrochloric acid, Stir magnetically for 1 hour to obtain the expanded graphite-polysulfide mixture; in a fume hood, stir the expanded graphite-polysulfide mixture in a water bath at 70°C for 1 hour, then vacuum filter, dry in a vacuum oven at 60°C, and then Heat treatment in a vacuum oven at 155° C. for 2 hours to obtain an expanded graphite-sulfur composite material.

[0048] The same procedure as described in Example 1 was followed to prepare the positive ele...

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Abstract

The invention relates to a battery positive-electrode as well as a preparation method and application thereof in lithium-sulfur batteries. The battery positive-electrode is provided with a metal current collector, positive active materials and an adhesive, and the positive active materials coat the current collector through the adhesive and comprise a carbon-based / sulfur composite material and a conductive agent. The preparation method comprises the following steps: putting a carbon-based material in water for ultrasonic treatment to obtain a carbon-based material dispersion liquid; mixing and dispersing sulfur and sodium sulfide in water, and adding TX 100 to obtain yellow polysulphide dispersion liquid; adding the yellow polysulphide dispersion liquid into the carbon-based material dispersion liquid for ultrasonic treatment, and then adding hydrochloric acid to obtain carbon-based-sulfide mixing liquid; carrying out a water bath and vacuum filtration, drying and then heating to obtain the carbon-based / sulfur composite material; mixing the carbon-based / sulfur composite material with the conductive agent, and grinding to obtain positive active material powder; mixing the positive active material powder with the adhesive solution to prepare positive active material powder slurry with an adhesive coating, coating the positive active material powder slurry on the metal current collector, and drying to obtain the battery positive-electrode.

Description

technical field [0001] The invention relates to a positive pole of a battery, in particular to a positive pole of a battery, a preparation method thereof and an application in a lithium-sulfur battery. Background technique [0002] Elemental sulfur has many advantages such as high energy density, abundant natural resources, low price, and environmental friendliness. It is an ideal cathode material for next-generation lithium-ion batteries. This field has always been a research hotspot. Compared with conventional lithium-ion batteries, a lithium-sulfur secondary battery with a theoretical capacity of 1672 mAh / g of sulfur as the positive electrode active material and lithium metal with a theoretical capacity of 3860 mAh / g as the negative electrode active material has a very high energy density, and has the potential to create small, lightweight secondary batteries that are increasingly in demand. Lithium-sulfur (Li-S) secondary batteries using elemental sulfur composite mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/66H01M4/38
CPCH01M4/13H01M4/139H01M4/38H01M4/587H01M4/661H01M10/0525Y02E60/10
Inventor 赵金保张义永
Owner XIAMEN UNIV