Composite electrolyte membrane based on functional polymer and preparation method thereof, and lithium-sulfur secondary cell

A composite electrolyte membrane and polymer technology, applied in the field of rechargeable lithium-sulfur batteries, can solve problems such as the deterioration of cycle performance of lithium-sulfur batteries, and achieve the effects of solving technical problems of performance degradation, suppressing migration loss, and improving cycle stability.
CN104157906AActive Publication Date: 2014-11-19NAT UNIV OF DEFENSE TECH
3 Cites 27 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2014-11-19

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a composite electrolyte membrane based on a functional polymer. The composite electrolyte membrane is mainly composed of a polymer porous diaphragm, a lithium perfluoro-sulfonamide single-lithium ion type polymer electrolyte coating which coats one side of the polymer porous diaphragm and a gel polymer coating which coats the other side of the polymer porous diaphragm, is stable to a lithium negative electrode and has a free radical capture function. A preparation method for the composite electrolyte membrane comprises the following steps: reacting a perfluoro-sulfuryl fluoride resin with lithium methide containing double electron-withdrawing groups so as to obtain a lithium perfluoro-sulfonamide polymer; carrying out washing and dissolving, then coating one side of the polymer porous diaphragm with the lithium perfluoro-sulfonamide polymer and adding a non-solvent for secondary film formation; and coating the other side of the polymer porous diaphragm with a gel polymer system which is stable to the lithium negative electrode, contains an additive and comprises a mixed liquor of a polymer, a solvent, a free radical annihilation effect additive and a nanometer filling material, and then carrying out drying so as to prepare the composite electrolyte membrane. The composite electrolyte membrane can improve cycling stability of a lithium-sulfur secondary cell.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the related technical field of rechargeable lithium-sulfur batteries, and in particular relates to a rechargeable lithium-sulfur battery, an electrolyte membrane used in the rechargeable lithium-sulfur battery and a related preparation process. Background technique

[0002] Li-S secondary batteries based on Li metal anode and sulfur cathode represent one of the highest energy density combinations of known chemically reversible systems. The theoretical energy density of the lithium-sulfur system is 2600Wh / kg, and the actual energy density that can be expected to be achieved is 700Wh / kg, which is three times that of the existing lithium-ion batteries. Although the achievable energy density of lithium-sulfur batteries has reached 300-400Wh / kg, the sulfur positive electrode is not conductive, the electrochemical reaction process is complicated, and the lithium negative electrode has high activity. The intermediate product lithium p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More