期刊
BATTERIES & SUPERCAPS
卷 2, 期 12, 页码 985-991出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.201900095
关键词
lithium metal batteries; solid composite electrolytes; poly(vinylidene fluoride-co-hexafluoropropylene); ionic liquids; hollow silica spheres
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC0500OR22725]
- Center for Functional Nanomaterials, a U.S. Departmental of Energy, Office of Science facility, Brookhaven National Laboratory [DE-SC0012704]
A central problem of solid polymer electrolytes is their inability to achieve robust mechanical strength with fast ionic conductivities required for commercialization of lithium metal batteries (LMBs). At present, state-of-the-art offers superiority of one at the expense of the other. Here, this dilemma has been solved by fabricating mechanically robust solid composite polymer electrolytes (SCPEs) with superior ionic conductivity (0.5 mScm(-1) at 20 degrees C) by confining ionic liquids (ILs) in the hollow scaffold offered by hollow silica (HS) nanospheres with unique architecture. Mechanical robustness was verified by the performance of a Li parallel to Li symmetric cell cycling for extended hours without short-circuiting. In addition, SCPEs with HS have higher thermal and electrochemical stabilities than those without HS, due to strong interaction and coordination of HS nanoparticles with polymer and ionic liquids. Electrode compatibility and flexibility of the membrane could advance the LMBs technology.
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