Ceramic-polymer composite electrolytes (CPEs) are being explored to achieve both high ionic conductivity and mechanical flexibility. Here, we show that, by incorporating 10 wt % (3 vol %) mixed-sized fillers of Li 7 La 3 Zr 2 O 12 (LLZO) doped with Nb/Al, the roomerature ionic conductivity of a polyvinylidene fluoride (PVDF)-LiClO 4 -based composite can be as high as 2.6 × 10 -4 S/cm, which is 1 order of magnitude higher than that with nano- or micrometer-sized LLZO particles as fillers. The CPE also shows a high lithium-ion transference number of 0.682, a stable and low Li/CPE interfacial resistance, and good mechanical properties favorable for all-solid-state lithium-ion battery applications. X-ray photoelectron spectroscopy and Raman analysis demonstrate that the LLZO fillers of all sizes interact with PVDF and LiClO 4 . High packing density (i.e., lower porosity) and long conducting pathways are believed responsible for the excellent performance of the composite electrolyte filled with mixed-sized ionically conducting ceramic particles.
|Number of pages||9|
|Journal||ACS Applied Materials and Interfaces|
|State||Published - Apr 3 2019|
Bibliographical noteFunding Information:
Y.S. and Y.S. gratefully acknowledge the financial support from the National Science Foundation of China no. 21671001 and 21571002. X.Z., J.H., Y.W., S.G., and Y.-T.C. gratefully acknowledge the financial support from the National Science Foundation (award no: 1355438, Powering the Kentucky Bioeconomy for a Sustainable Future). X.Z. would like to thank the Department of Chemical and Materials Engineering at the University of Kentucky for its partial financial support of this work. Y.S. would like to acknowledge the support from the China Scholarship Council. The authors would like to thank Namal Wanninayake of the University of Kentucky for helping with Raman measurements.
© 2019 American Chemical Society.
- Li La Zr O
- ceramicâpolymer interactions
- composite polymer electrolytes
- ionic conductivity
- lithium batteries
ASJC Scopus subject areas
- Materials Science (all)