New lithium sulfur battery positive electrode and lithium sulfur battery comprising new lithium sulfur battery positive electrode

A lithium-sulfur battery and positive electrode technology, applied in the field of chemical power sources, can solve the problems that limit the large-scale application of lithium-sulfur batteries, the utilization rate of active materials and the battery cycle characteristics cannot meet commercial applications, etc.

Inactive Publication Date: 2014-07-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 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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  • New lithium sulfur battery positive electrode and lithium sulfur battery comprising new lithium sulfur battery positive electrode
  • New lithium sulfur battery positive electrode and lithium sulfur battery comprising new lithium sulfur battery positive electrode
  • New lithium sulfur battery positive electrode and lithium sulfur battery comprising new lithium sulfur battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Mix the active sulfur powder of 60 parts by weight and the conductive agent acetylene black of 30 parts by weight, and grind and mix homogeneously with a mortar to obtain positive active material powder; 10 parts by weight of binder PVDF are dissolved in 90 parts by weight of solvent N- A binder solution prepared in methyl-2-pyrrolidone; with solvent N-methyl-2-pyrrolidone, 90 parts by weight of the positive electrode active material powder and 100 parts by weight of the binder solution are mixed and stirred for 1 hour or longer Time, prepare the powder slurry of the positive electrode active material including the binder coating; apply the powder slurry on the copper foil current collector with an automatic coating machine, and vacuum dry it in an oven at 60°C for 10~24h The solvent was removed to prepare a positive electrode sheet for the lithium-sulfur battery of Example 1 in the embodiment of the present invention, wherein the weight ratio of sulfur-containing elemen...

Embodiment 2

[0044] Mix 65 parts by weight of active sulfur powder and 30 parts by weight of conductive agent acetylene black, and grind and mix uniformly with a mortar to obtain positive active material powder; use solvent N-methyl-2-pyrrolidone to prepare and mix the above positive active material powder, An aqueous solution containing 2 parts by weight of the CMC adhesive, an emulsion containing 3 parts by weight of the SBR adhesive, stirred for 1 hour or longer, and prepared into a powder slurry comprising a positive electrode active material of the binder coating; The powder slurry is coated on the copper foil current collector with an automatic coating machine, and vacuum-dried in an oven at 60°C for 10-24 hours to remove the solvent, and the positive electrode sheet for the lithium-sulfur battery of Example 2 in the embodiment of the present invention is obtained , wherein the weight ratio of sulfur-containing elements is 65%.

[0045] Using the positive electrode material and metal...

Embodiment 3

[0047] Mix 75 parts by weight of active sulfur powder, 75 parts by weight of electrolytic copper powder, 20 parts by weight of conductive agent acetylene black, and grind and mix uniformly with a mortar to obtain positive active material powder; use solvent N-methyl-2-pyrrolidone to prepare Mix the above-mentioned positive electrode active material powder, an aqueous solution containing 2 parts by weight of the CMC adhesive, and an emulsion containing 3 parts by weight of the SBR adhesive, and stir for 1 hour or longer to prepare a positive electrode active material including a binder coating. Powder slurry; the powder slurry is coated on the copper foil current collector with an automatic coating machine, and vacuum-dried in an oven at 60°C for 10 to 24 hours to remove the solvent, and the powder used in Example 3 in the embodiment of the present invention is obtained. Positive pole piece of lithium-sulfur battery.

[0048] Using the positive electrode material and metal lith...

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Abstract

The invention provides a new lithium sulfur battery positive electrode, a preparation method thereof and a lithium sulfur battery comprising the new lithium sulfur battery positive electrode. The new lithium sulfur battery positive electrode comprises a metal current collector, elemental sulfur or a sulfur compound as a positive electrode active material coating the metal current collector, transition metal powder, a conductive material and a binder. The lithium sulfur battery comprising the new lithium sulfur battery positive electrode has high sulfur utilization rate and excellent cycle stability, to be more specific, the discharge capacity of sulfur per unit weight in the positive electrode composite material reaches up to 1624mAh/g, the elemental sulfur utilization rate reaches more than 97%, and after hundreds of times of cycling at the room temperature, the highest positive electrode specific discharge capacity can be maintained at more than 88% of the theoretical specific discharge capacity (1675mAh/g) of the elemental sulfur.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a lithium-sulfur battery whose positive pole includes the positive pole. 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 1675mAh / g sulfur as the positive electrode active material and lithium metal with a theoretical capacity of 3860mAh / g as the negative electrode active material has a very high energy density , and has the potential to manufacture secondary batteries that are small in size and light in weight and are increasingly in demand. Lithium-sulfur (Li-S) secondary batteries using elemental sulfur composite material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/66H01M10/052
CPCH01M4/661H01M10/052Y02E60/10
Inventor 赵金保刘波王绪向
Owner XIAMEN UNIV
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