All-solid-state lithium-sulfur battery

A lithium-sulfur battery, all-solid-state technology, used in batteries, secondary batteries, battery electrodes, etc., can solve the problems of flying shuttle effect, large interface contact resistance, and reduced Coulomb efficiency, and achieve the advantages of large-scale production and interface contact. Small impedance and the effect of improving Coulombic efficiency

Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1. Polysulfides, the discharge intermediate products of the sulfur positive electrode, dissolve in the electrolyte, which on the one hand causes the shuttle effect and reduces the Coulombic efficiency; on the other hand, the polysulfides diffuse through the diaphragm to the negative electrode, corroding metal lithium
2. In batteries using organic electrolytes, due to the uneven deposition of lithium ions, dendrites are easily formed on the metal lithium negative electrode. On the one hand, dead lithium affects the cycle performance of the battery; on the other hand, the dendrites penetrate the separator and cause a short circuit of the battery
3. The boiling point of the organic electrolyte is low. In the case of abuse, such as overcharging, over-disc

Method used

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Examples

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Effect test

Embodiment 1

[0042] Soak the perfluorosulfonic acid-polytetrafluoroethylene membrane in 1M LiOH aqueous solution at 80°C for 12 hours, then wash it with solvent for 3 to 10 times to remove the LiOH on the membrane surface, and then dry it at 100°C for 2 hours. Vacuum drying at 60°C for 48 hours to obtain a lithiated perfluorosulfonic acid-polytetrafluoroethylene membrane. Using NMP as solvent, a lithiated perfluorosulfonic acid-polytetrafluoroethylene polymer emulsion with a mass fraction of 5% was prepared at 80°C. Sulfurized polyacrylonitrile, acetylene black, and lithiated perfluorosulfonic acid-polytetrafluoroethylene polymer are weighed at a mass ratio of 6:2:2 as the positive electrode active material, mixed and ground with NMP as a solvent, and then coated on an aluminum foil and dried overnight in a vacuum oven at 55°C to obtain a sulfur cathode. The lithiated perfluorosulfonic acid-polytetrafluoroethylene membrane and the sulfur positive electrode were hot-pressed at 120 °C and 0...

Embodiment 2

[0044] Soak the polytrifluorostyrene sulfonic acid membrane in 2M LiOH in DMSO solution at 100°C for 12 hours, then wash it with a solvent for 3 to 10 times to remove LiOH on the membrane surface, and then dry it at 100°C for 6 hours. Then vacuum-dry at 100°C for 48 hours to obtain a lithiated polytrifluorostyrene sulfonic acid membrane. Using DMF as a solvent, a lithiated polytrifluorostyrene sulfonic acid polymer emulsion with a mass fraction of 10% was prepared at 60°C. Weigh the positive electrode active materials iron sulfide, Super-P, and lithiated polytrifluorostyrene sulfonic acid polymer at a mass ratio of 5:1:4, mix and grind them evenly with DMF as a solvent, and coat them on carbon-coated aluminum foil , dried overnight in a vacuum oven at 55°C to obtain a sulfur cathode. The lithiated polytrifluorostyrene sulfonic acid membrane and the sulfur positive electrode were hot-pressed at 110 °C and 1 MPa pressure for 3 min to obtain an integrated positive electrode and ...

Embodiment 3

[0046] The polydifluorostyrene sulfonic acid membrane was soaked in a mixed solution of 1M LiOH ethanol and water (volume ratio 1:1) at 80°C for 12 hours, then washed with solvent for 3 to 10 times to remove LiOH on the membrane surface, and then placed on Blast drying at 80°C for 6 hours, and then vacuum drying at 40°C for 48 hours to obtain a lithiated polydifluorostyrene sulfonic acid membrane. Using DMAc as a solvent, a lithiated poly(difluorostyrene sulfonic acid) polymer emulsion with a mass fraction of 4% was prepared at 90°C. The positive electrode active material sublimated sulfur selenium solid solution, ketjen black, and lithiated polydifluorostyrene sulfonic acid polymer were weighed at a mass ratio of 4:3:3, mixed and ground with DMAc as a solvent, and then coated on copper foil and dried overnight in a vacuum oven at 55°C. The lithiated polydifluorostyrene sulfonic acid membrane and the sulfur positive electrode were hot-pressed at 100°C and 2 MPa pressure for 3...

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Abstract

The invention discloses an all-solid-state lithium-sulfur battery. The all-solid-state lithium-sulfur battery comprises a sulfur positive electrode, a lithium or lithium alloy negative electrode, and a lithiated sulfoacid polymer solid electrolytic diaphragm; the solid electrolytic diaphragm is positioned between the sulfur positive electrode and the lithium or lithium alloy negative electrode; the sulfur positive electrode comprises a sulfur-containing active material, a conductive agent and a lithiated sulfoacid polymer; and the sulfur positive electrode, the lithiated sulfoacid polymer solid electrolyte and the lithium or lithium alloy negative electrode are assembled in a superimposition manner in sequence to form the battery. The room temperature ionic conductivity of the lithiated sulfoacid polymer solid electrolyte is greater than 10<-5>S/cm, and complexing of a lithium salt is not needed; the preparation method is simple; in addition, the room temperature ionic conductivity of the lithiated sulfoacid polymer solid electrolyte is better than that of a common inorganic-organic composite solid electrolyte; the sulfur positive electrode pole piece is prepared by adopting a polymer emulsion, and an efficient "sulfur/carbon/solid electrolyte" interface is established in the electrode, so that the activity of the sulfur electrode is improved and the battery with excellent performance is obtained; and in addition, the existing pole piece coating process and equipment can be utilized, and large scale production can be facilitated.

Description

technical field [0001] The invention relates to a lithiated sulfonic acid polymer solid electrolyte, a preparation method thereof, and an all-solid lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries have become the next generation of secondary battery systems due to their high energy density and low cost. However, most of the lithium-sulfur batteries reported at present use organic electrolytes with low boiling points, and there are still some technical problems that need to be solved urgently. 1. Polysulfide, the discharge intermediate product of the sulfur positive electrode, dissolves in the electrolyte, which on the one hand causes the shuttle effect and reduces the Coulombic efficiency; on the other hand, the polysulfide diffuses through the separator to the negative electrode and corrodes metal lithium. 2. In a battery using an organic electrolyte, due to the uneven deposition of lithium ions, dendrites are easily formed on the metal lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M2/16H01M4/62H01M4/13H01M4/136H01M4/137H01M50/403H01M50/411H01M50/497
CPCH01M4/13H01M4/136H01M4/137H01M4/62H01M10/0565H01M2220/20H01M2220/30H01M50/411Y02E60/10
Inventor 陈剑高静陶韬刘颖佳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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