Sulfur-containing composite anode, preparation method thereof and lithium-sulfur battery using sulfur-containing composite anode as anode

A technology of composite positive electrode and conductive agent, applied in the direction of lithium battery, battery electrode, non-aqueous electrolyte battery, etc., can solve problems such as battery performance degradation, and achieve the effects of improving discharge voltage, simple preparation process, and improving the specific energy of first discharge

Active Publication Date: 2015-06-17
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 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 anode, preparation method thereof and lithium-sulfur battery using sulfur-containing composite anode as anode
  • Sulfur-containing composite anode, preparation method thereof and lithium-sulfur battery using sulfur-containing composite anode as anode
  • Sulfur-containing composite anode, preparation method thereof and lithium-sulfur battery using sulfur-containing composite anode as anode

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Embodiment 1

[0030] Active material preparation: Weigh the corresponding materials according to carbon fluoride: elemental sulfur = 50:50 (mass ratio), mix them initially and put them in a mortar for grinding and mixing to prepare active materials mixed with carbon fluoride additives.

[0031] 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 ) into the above binder solution, fully stirred to form a uniform conductive agent suspension; then add 0.7g of pre-mixed active material, fully stirred to form a stable slurry suspension. The slurry was coated on the corroded aluminum foil current collector with a doctor blade, and dried at 70° C. for 2 hours until the NMP volatilized completely. Active material in the pole piece after drying: conductive agent: binder = 70:20:10. The surface dens...

Embodiment 2

[0035] Active material preparation: Weigh the corresponding materials according to carbon fluoride: elemental sulfur = 40:60 (mass ratio), mix them initially and place them in a mortar for grinding and mixing to prepare active materials mixed with carbon fluoride additives.

[0036] 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 ) into the above binder solution, fully stirred to form a uniform suspension; then add 0.7g of pre-mixed active material, fully stirred to form a stable slurry suspension. The slurry was coated on the corroded aluminum foil current collector with a doctor blade, and dried at 70° C. for 2 hours until the NMP volatilized completely. Active material in the pole piece after drying: conductive agent: binder = 70:20:10. The surface density of the cont...

Embodiment 3

[0040] Active material preparation: Weigh the corresponding materials according to carbon fluoride: elemental sulfur = 35:65 (mass ratio), mix them initially and put them in a mortar for grinding and mixing to prepare active materials mixed with carbon fluoride additives.

[0041]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 ) into the above binder solution, fully stirred to form a uniform suspension; then add 0.7g of pre-mixed active material, fully stirred to form a stable slurry suspension. The slurry was coated on the corroded aluminum foil current collector with a doctor blade, and dried at 70° C. for 2 hours until the NMP volatilized completely. Active material in the pole piece after drying: conductive agent: binder = 70:20:10. The surface density of the control...

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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

[0001] technical field [0002] The invention relates to the technical field of chemical power sources, in particular to a sulfur-containing composite positive electrode, a preparation method thereof, and a lithium-sulfur battery using the same as the positive electrode. [0003] Background technique [0004] Lithium-sulfur battery is a high-energy-density chemical power source that has attracted much attention and invested a lot of research in recent years. The electrochemical reaction of a lithium-sulfur battery with elemental sulfur as the positive electrode 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, the theoretical specific capacity of elemental sulfur is 1672mAh / g, metal lithium has a theoretical specific capacity of 3860mAh / g, and the theoretical energy density of Li / S redox pair is as high as 2600Wh / kg. It can be seen that lithium-sulfur batteries have the characteristics of high en...

Claims

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Application Information

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Patent Type & Authority Applications(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
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