Affiliation:
1. College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 P. R. China
2. Department of Mechanical Engineering City University of Hong Kong Hong Kong SAR 999077 P. R. China
3. School of Biomedical and Pharmaceutical Sciences Guangdong University of Technology Guangzhou 510006 P. R. China
4. College of Materials Science and Engineering Shenzhen University Shenzhen 518060 P. R. China
5. Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Center Shenzhen 518060 P. R. China
Abstract
AbstractThe 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 µm) 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 °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.
Funder
Shenzhen Science and Technology Innovation Program
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials