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Positive pole for lithium-sulfur cell, its preparation method and lithium-sulfur cell

A lithium-sulfur battery and positive electrode technology, applied in the field of lithium-sulfur battery positive electrode and its manufacture and lithium-sulfur battery, can solve the problems such as the pseudo-boehmite layer is difficult to bend, cannot directly promote the electrochemical reaction, and the capacity increase is small

Inactive Publication Date: 2007-08-08
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this does not directly promote the electrochemical reaction, and the increase in capacity is also small
In addition, the pseudo-boehmite layer is so brittle that it is difficult to bend during battery fabrication.

Method used

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  • Positive pole for lithium-sulfur cell, its preparation method and lithium-sulfur cell
  • Positive pole for lithium-sulfur cell, its preparation method and lithium-sulfur cell
  • Positive pole for lithium-sulfur cell, its preparation method and lithium-sulfur cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 60 wt% elemental sulfur (S 8 ) active material, 20wt% carbon conductive material and 20wt% polyvinylidene fluoride binder are dissolved in dimethylformamide solvent to prepare slurry. The slurry was coated on a carbon-coated aluminum current collector. The coated current collector is dried and pressed. The pressed current collector is coated with a polymer liquid. Polymer liquids were prepared by dissolving polyvinylidene fluoride in methylformamide solvent. The concentration of the polymer liquid was 5 wt%.

[0052] The resulting current collector was dried at room temperature for 2 hours or more, followed by drying at 50° C. for 12 hours or more to prepare a positive electrode.

[0053] A lithium-sulfur battery is fabricated using a positive electrode and a lithium foil negative electrode. As the electrolyte, 1M LiSO in a mixed solvent of 1,3-dioxolane, diglyme, sulfolane and dimethoxyethane (50:20:10:20 by volume) was used. 3 CF 3 .

Embodiment 2

[0055] A lithium-sulfur battery was fabricated in the same procedure as in Example 1, except that a polymer liquid was prepared by dissolving polyvinylpyrrolidone in an isopropanol solvent.

Embodiment 3

[0057] A lithium-sulfur battery was fabricated in the same procedure as in Example 1, except that a polymer liquid was prepared by dissolving polyethylene oxide in an acetonitrile solvent.

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Abstract

A positive electrode of a lithium-sulfur battery, a method of producing the same, and a lithium-sulfur battery include, as the positive electrode, a current collector, a positive active material layer on the current collector, and a polymer layer on the positive active material on the current collector.

Description

[0001] Cross References to Related Applications [0002] This application is based on Korean Patent Application No. 2002-46581 filed with the Korean Intellectual Property Office on August 7, 2002, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a positive electrode for a lithium-sulfur battery, a preparation method for the positive electrode, and a lithium-sulfur battery, and more particularly, the present invention relates to a positive electrode for a lithium-sulfur battery with high initial capacity. Background technique [0004] The continuous development of mobile electronic devices has created a demand for secondary batteries with lighter weight and higher capacity. To meet these needs, lithium-sulfur batteries with sulfur-based compounds as cathodes are most promising. [0005] Lithium-sulfur batteries use sulfur-based compounds with sulfur-sulfur bonds as positive electrode active materials, and...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/60H01M4/04H01M10/36H01M10/05H01M2/16H01M4/136H01M4/137H01M4/139H01M4/1397H01M4/1399H01M4/38H01M4/40H01M4/58H01M4/62H01M10/052H01M10/0566
CPCH01M4/04H01M4/0404H01M4/60H01M4/58H01M4/043H01M4/136H01M4/581H01M10/052H01M4/62H01M4/1397Y02E60/122Y02E60/10
Inventor 黄德哲朴真李济玩
Owner SAMSUNG SDI CO LTD