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Positive electrode material of polypyrrole lithium sulfur battery and preparation method of positive electrode material

A cathode material, lithium polypyrrole technology, applied in battery electrodes, circuits, electrical components, etc., to achieve high capture capacity, improved energy density and cycle performance, and good reversibility.

Inactive Publication Date: 2015-03-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no report about the synthesis of self-supporting polypyrrole film on the surface of solution by electrochemical cyclic voltammetry as anode material for lithium-sulfur batteries.

Method used

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  • Positive electrode material of polypyrrole lithium sulfur battery and preparation method of positive electrode material
  • Positive electrode material of polypyrrole lithium sulfur battery and preparation method of positive electrode material
  • Positive electrode material of polypyrrole lithium sulfur battery and preparation method of positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Weigh 0.700 g of p-toluenesulfonic acid and dissolve in 30 mL of deionized water. After magnetic stirring for 3 minutes, weigh 0.200 g of sodium dodecylbenzene sulfonate, add sodium dodecylbenzene sulfonate to the above aqueous solution while maintaining magnetic stirring, and continue stirring for 5 minutes. Then add 0.2 mol of the pyrrole monomer that has been distilled twice with a needle, stir it magnetically for 3 minutes, and ultrasonically shake for 5 minutes to obtain the electrolyte required for electrochemical synthesis, pH=1~2, and let the electrolyte stand for 10 minutes for use.

[0041] Pretreatment of working electrode and counter electrode. The tantalum electrode and the stainless steel electrode are treated with hydrochloric acid, ethanol, and acetone in sequence before use. The purpose is to remove organic matter such as grease on the electrode surface. Before using the tantalum electrode, the side facing the stainless steel electrode is pasted with tran...

Embodiment 2

[0050] Weigh 0.700 g of p-toluenesulfonic acid and dissolve in 30 mL of deionized water. After magnetic stirring for 3 minutes, weigh 0.250 g of sodium dodecylbenzene sulfonate, add sodium dodecylbenzene sulfonate to the above aqueous solution while maintaining magnetic stirring, and continue stirring for 5 minutes. Then add 0.2 mol of the pyrrole monomer that has been distilled twice with a needle, magnetically stir for 3 minutes, and ultrasonically shake for 5 minutes to obtain the electrolyte required for electrochemical synthesis, pH=2.0-3.0. The electrolyte is allowed to stand for 10 minutes for use.

[0051] Pretreatment of working electrode and counter electrode. The tantalum electrode and the stainless steel electrode are treated with hydrochloric acid, ethanol, and acetone in sequence before use. The purpose is to remove organic matter such as grease on the electrode surface. Before using the tantalum electrode, the side facing the stainless steel electrode is pasted wi...

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Abstract

The invention discloses a positive electrode material of a polypyrrole lithium sulfur battery and a preparation method of the positive electrode material. The positive electrode material of the polypyrrole lithium sulfur battery is formed by compounding a polypyrrole film the surface on which lotus-leaf-shaped and / or hollow-sphere-shaped and / or particle-shaped polypyrrole bodies grow and elemental sulfur. The preparation method comprises the steps that tantalum is used as a working electrode, stainless steel is a counter electrode, saturated hydrargyri monochloridum is a reference electrode, and electrolyte solution is aqueous solution containing a dopant and pyrrole monomers; polypyrrole is prepared by using an electrochemical three-electrode method and is melted and compounded with the elemental sulfur under a vacuum condition to prepare the positive electrode material of the polypyrrole lithium sulfur battery. The method is simple in steps and convenient to operate; the prepared positive electrode can be used for preparing the lithium sulfur battery with high energy density, high energy retention rate and high circulating performance.

Description

Technical field [0001] The invention relates to a polypyrrole lithium-sulfur battery cathode material and a preparation method thereof, and belongs to the field of lithium-sulfur batteries. Background technique [0002] At present, the continuous development of the automobile industry has put forward more demand for power batteries with higher energy density, longer service life and lower purchase prices. For lithium-ion battery systems, the specific capacity of the positive electrode material has a significant impact on the energy density of the battery. Therefore, people are actively looking for cathode materials that can meet demand. Lithium-sulfur batteries have thus entered people's field of vision. The specific capacity of elemental sulfur is 1675mAh / g. After being assembled with lithium metal to form a lithium-sulfur battery, its theoretical specific energy is 2600wh / kg, which is 7 times the theoretical specific energy (360wh / kg) of the lithium battery estimated by the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60
CPCY02E60/10
Inventor 潘勇李真真成娟娟潘俊安田槟铖刘才超曹欢雷维新
Owner XIANGTAN UNIV
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