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Sulfur-containing composite positive electrode, preparation method thereof, and lithium-sulfur battery using it as positive electrode

A composite cathode, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as battery performance degradation, and achieve the effects of increasing discharge voltage, improving conductivity, and increasing the specific energy of the first discharge

Active Publication Date: 2017-04-19
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem that the present invention solves is that existing lithium-sulfur battery is due to Li 2 S deposition leads to a decline in battery performance; in order to solve the problem, the invention provides a sulfur-containing composite positive electrode, a preparation method thereof, and a lithium-sulfur battery using it as a positive electrode

Method used

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  • Sulfur-containing composite positive electrode, preparation method thereof, and lithium-sulfur battery using it as positive electrode
  • Sulfur-containing composite positive electrode, preparation method thereof, and lithium-sulfur battery using it as positive electrode

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Embodiment 1

[0025] Active material preparation: Weigh the corresponding materials according to carbon fluoride: elemental sulfur = 50:50 (mass ratio), and place them in a mortar to grind and mix after preliminary mixing to prepare active materials mixed with carbon fluoride additives.

[0026] Preparation of sulfur-containing composite positive electrode: Weigh 0.1g binder polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP), stir to form a uniform solution; weigh 0.2g conductive agent superconducting carbon black (Super P ) Add to the above-mentioned binder solution, stir thoroughly to form a uniform conductive agent suspension; then add 0.7 g of the pre-mixed active material, stir thoroughly to form a stable slurry suspension. Use a doctor blade to coat the slurry on the corroded aluminum foil current collector and dry at 70°C for 2 hours until the NMP is completely volatilized. The active material in the pole piece after drying: conductive agent: binder=70:20:10. C...

Embodiment 2

[0029] Active material preparation: Weigh the corresponding materials according to carbon fluoride: elemental sulfur=40:60 (mass ratio), and place them in a mortar after preliminary mixing to grind and mix to prepare active materials mixed with carbon fluoride additives.

[0030] Preparation of sulfur-containing composite positive electrode: Weigh 0.1g binder polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP), stir to form a uniform solution; weigh 0.2g conductive agent superconducting carbon black (Super P ) Add to the above-mentioned binder solution, stir fully to form a uniform suspension; then add 0.7 g of the pre-mixed active material, stir fully to form a stable slurry suspension. Use a doctor blade to coat the slurry on the corroded aluminum foil current collector and dry at 70°C for 2 hours until the NMP is completely volatilized. The active material in the pole piece after drying: conductive agent: binder=70:20:10. Control the surface density of...

Embodiment 3

[0033] Active material preparation: Weigh the corresponding materials according to fluorocarbon: elemental sulfur=35:65 (mass ratio), and place them in a mortar to grind and mix after preliminary mixing to prepare active materials mixed with fluorocarbon additives.

[0034] Preparation of sulfur-containing composite positive electrode: Weigh 0.1g binder polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP), stir to form a uniform solution; weigh 0.2g conductive agent superconducting carbon black (Super P ) Add to the above-mentioned binder solution, stir fully to form a uniform suspension; then add 0.7 g of the pre-mixed active material, stir fully to form a stable slurry suspension. Use a doctor blade to coat the slurry on the corroded aluminum foil current collector and dry at 70°C for 2 hours until the NMP is completely volatilized. The active material in the pole piece after drying: conductive agent: binder=70:20:10. Control the surface density of the c...

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Abstract

The invention relates a preparation method of a sulfur-containing composite anode for a lithium-sulfur battery, and a lithium-sulfur battery using the composite anode. According to the invention, a carbon fluoride additive with electrochemical activity is added in a process of sulfur-containing anode processing to prepare a composite sulfur-containing anode, so that the electrochemical activity of the sulfur-containing anode with a high sulfur content is improved, and the first electro-discharge specific energy of the lithium-sulfur battery is improved. The mass ratio of the active additive of the carbon fluoride to whole active substances is 20%-50%. The invention provides the preparation method of the sulfur-containing composite anode; on one side, since the electro-discharge product of the active additive of the carbon fluoride, the conductivity can be improved in the following electro-discharge process of a sulfur material, so that the sulfur-containing anode with a high sulfur content discharges normally; on the other side, carbon fluoride has electrochemical activity, the electro-discharge capacity isn't affected; the electro-discharge voltage of the anode is improved; and the first electro-discharge specific energy of a lithium-sulfur battery, especially a lithium-sulfur primary battery, is increased.

Description

Technical field [0001] The present invention relates to the technical field of chemical power sources, in particular to a sulfur-containing composite anode, a preparation method thereof, and a lithium-sulfur battery using the anode as the anode. Background technique [0002] Lithium-sulfur batteries are high-energy-density chemical power sources that have attracted much attention and more research in recent years. The electrochemical reaction of a lithium-sulfur battery with elemental sulfur as the anode is as follows: S 8 +Li→Li 2 S x (1≤ x ≤8)→Li 2 S. According to the final reduction reaction product Li 2 S calculation shows that the theoretical specific capacity of elemental sulfur is 1672mAh / g, metallic lithium has a theoretical specific capacity of 3860mAh / g, and the theoretical energy density of Li / S redox couple is as high as 2600Wh / kg. It can be seen that lithium-sulfur batteries have the characteristics of high energy density. , It has broad application prospects in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/139
CPCH01M4/13H01M4/133H01M4/139H01M4/1393H01M4/62H01M10/052Y02E60/10
Inventor 郭瑞李永刘雯裴海娟解晶莹戴扬
Owner SHANGHAI INST OF SPACE POWER SOURCES