Abstract:

The development of advanced composite solid-state electrolytes (CSSEs) is considered to be one of the most promising directions for achieving breakthroughs in lithium battery technology. To enhance overall performance of electrolytes, such as mechanical properties, electrochemical behavior, and especially thermal stability.
In the first year of my Ph.D. study, we propose the design of a novel CSSE that simultaneously integrates the activated metal-organic frameworks (MOFs) and ceramic as the multi-functional fillers and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as the lithium salt by simple casting method. Uniform membranes with natural bilayers of ~150 μm thickness are obtained and abbreviated as PMC CSSEs. The crystal structure, morphology, thermal stability, mechanical properties, and electrochemical performance are characterized systematically, and the results indicate that PMC possesses improved mechanical properties, excellent cycling performance, and better fire resistance compared to the conventional PEO solid-polymer electrolytes (SPEs), which benefits from the synergistic effect of [Cu3(BTC)2(H2O)3]·Guest (HKUST-1) and Li6.4La3Zr1.4Ta0.6O12 (LLZTO). To the best of our knowledge, this is the first work to simultaneously introduce ceramic and MOFs into SSEs, which provides a promising direction for advancing the development of high-performance CSSEs. In the future, material design, method exploration, and mechanism analysis targeting battery thermal runaway will be further promoted.