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.
Active Publication Date: 2014-11-19
NAT UNIV OF DEFENSE TECH
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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.
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Property | Measurement | Unit |
Thickness | 100.0 | µm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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