期刊
ADVANCED FUNCTIONAL MATERIALS
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202307736
关键词
anion locking; interface compatibility; polymer electrolytes; thermal conduction; wide-temperature operation
A novel ultrathin polymer electrolyte with significantly enhanced multiple kinetics is developed using a densified polyacrylonitrile/silicon dioxide nanofiber membrane as a mediator. It exhibits excellent mechanical properties and high-temperature structural stability, enabling reversible zinc metal anodes at elevated temperatures.
The sluggish ion transport kinetics and poor interface compatibility are the major challenges for developing high-performance solid-state zinc metal batteries. Here, using the densified polyacrylonitrile/silicon dioxide (PAN-SiO2) nanofiber membrane as a unique multifunctional mediator, a novel mediator-bridged type of ultrathin (28.6 mu m) polymer electrolyte that is rationally designed. The PAN/SiO2 /polyethylene oxide/Zn(OTf)(2)(PSPZ) polymer electrolyte is demonstrated to significantly enhance multiple kinetics. In addition to superior mechanical properties, the efficient thermal conductive effect endows it with good high-temperature structural stability. Interestingly, a unique PAN skeleton-locking-anion-enabled fast ion transport mechanism is uncovered to achieve a high Zn2+ migration number (0.71). Moreover, an efficient dendrite-free Zn deposition guided by a flat dense SEI is demonstrated. In this case, highly reversible Zn metal anodes can be realized in the temperature range extending to -25-80 degrees C, as well as an impressive 4800 h-cycle lifespan at the condition of 0.1 mA cm(-2). Beyond that, wide-temperature, high-rate, durable PSPZ-based solid-state Zn/VO2 batteries are also successfully verified. This brand-new concept of multiple-kinetics-enhanced polymer electrolyte design can provide a new perspective for developing all-climate fast-charging solid-state batteries, including but not limited to zinc metal batteries.
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