Lithium-sulfur secondary battery

A technology for lithium-sulfur secondary batteries and battery casings, which is applied to secondary batteries, battery pack components, circuits, etc., and can solve the difficulties of large-scale production of lithium-sulfur secondary batteries, shortened service life, and low Coulombic efficiency, etc. problems, to achieve the effects of easy mass production, prolonging service life, and suppressing side reactions

Active Publication Date: 2013-01-30
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention patents related to lithium-sulfur secondary batteries retrieved above each solve different problems of lithium-sulfur secondary batteries, but generally have low coulombic efficiency, high side reactions leading to shortened service life, and problems of relatively complicated production and high cost , making it difficult for lithium-sulfur secondary batteries to be mass-produced

Method used

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Examples

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Embodiment 1

[0025] elemental sulfur S 8 , SP conductive agent, and PVDF binder are mixed evenly in NMP solvent at a mass ratio of 60:30:10 to form a slurry with a solid content of 30% as the positive electrode material, which is coated on the aluminum foil positive electrode current collector and dried in a vacuum oven. After drying in medium for 6 hours, it was pressed into a positive electrode sheet; the nitrocellulose membrane was placed between the positive surface of the positive electrode sheet and the Celgard2400 porous diaphragm, and a piece of lithium-silicon alloy as a negative electrode sheet was placed on the other side of the porous diaphragm, and pressed into a figure 2 The one shown in the figure is placed in the battery casing, and the solute is injected into the electrolyte solution of lithium hexafluorophosphate and ethylene methyl carbonate to make a CR2430 lithium-sulfur secondary button battery. After testing, the battery charge and discharge cut-off voltage is 1.5-2...

Embodiment 2

[0027] lithium polysulfide Li 2 S 4 , multi-walled carbon nanotube conductive agent, and water-based glue are uniformly mixed in water according to a mass ratio of 70:20:10 to form a slurry with a solid content of 35% as the positive electrode material. A lithium-sulfur secondary button battery with a cellulose film is tested after the battery is made. The charge-discharge cycle test is performed at a current density of 1C. The specific capacity of the first discharge is 805.0mAh / g, and the specific capacity after 50 cycles is 629.3 mAh / g.

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Abstract

The invention relates to a lithium-sulfur secondary battery comprising a positive electrode current collector, a positive electrode material, a porous diaphragm and a lithium-containing negative electrode plate as well as electrolyte, which are compressed integrally in a battery shell from bottom to top. The lithium-sulfur secondary battery is characterized in that a cellulose membrane is compressed between the positive electrode material and the porous diaphragm, and is one of a nitrocellulose membrane, a cellulose acetate membrane and a regenerated cellulose membrane. According to the invention, because the cellulose membrane is compressed between the positive electrode material and the porous diaphragm, and prevents polysulfide from transferring to a metal lithium negative electrode plate along with electrolyte in the lithium-sulfur secondary battery, inhibits side reaction caused by a 'shuttle flying phenomenon', effectively improves the coulombic efficiency of the lithium-sulfur secondary battery, prolongs the service life of the battery, and also is simple to operate, low in cost, and easy for mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur secondary battery systems, and in particular relates to a lithium-sulfur secondary battery. Background technique [0002] Lithium-sulfur secondary batteries refer to rechargeable batteries that use metallic lithium as the negative electrode, and elemental sulfur, sulfur-based composite materials, or organic sulfides (collectively referred to as sulfur-containing materials) as the positive electrode. Elemental sulfur can react with lithium to form lithium sulfide (Li 2 S), the theoretical capacity of this electrochemical reaction based on elemental sulfur is as high as 1672mAh / g, and elemental sulfur is cheap, safe and non-toxic, and it is a new positive electrode active material with great development potential, with high energy density, long cycle life, high Safe, low-cost lithium-sulfur secondary batteries represent the development direction of next-generation batteries. However, during...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M2/16
CPCY02E60/12Y02E60/10
Inventor 余劲鹏丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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