Highly Stretchable Polyurethane Porous Membranes with Adjustable Morphology for Advanced Lithium Metal Batteries.
Chem Asian J
; 19(14): e202400245, 2024 Jul 15.
Article
in En
| MEDLINE
| ID: mdl-38634677
ABSTRACT
A highly flexible, tunable morphology membrane with excellent thermal stability and ionic conductivity can endow lithium metal batteries with high power density and reduced dendrite growth. Herein, a porous Polyurethane (PU) membrane with an adjustable morphology was prepared by a simple nonsolvent-induced phase separation technique. The precise control of the final morphology of PU membranes can be achieved through appropriate selection of a nonsolvent, resulting a range of pore structures that vary from finger-like voids to sponge-like pores. The implementation of combinatorial DFT and experimental analysis has revealed that spongy PU porous membranes, especially PU-EtOH, show superior electrolyte wettability (472%), high porosity (75%), good mechanical flexibility, robust thermal dimensional stability (above 170 °C), and elevated ionic conductivity (1.38â
mS cm-1) in comparison to the polypropylene (PP) separator. The use of PU-EtOH in Li//Li symmetric cell results in a prolonged lifespan of 800â
h, surpasing the longevity of PU or PP cells. Moreover, when subjected to a high rate of 5â
C, the LiFePO4/Li half-cell with a PU-EtOH porous membrane displayed better cycling performance (115.4â
mAh g-1) compared to the PP separator (104.4â
mAh g-1). Finally, the prepared PU porous membrane exhibits significant potential for improving the efficiency and safety of LMBs.
Full text:
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Chem Asian J
Year:
2024
Document type:
Article