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The Effects of Constriction Factor and Geometric Tortuosity on Li‐Ion Transport in Porous Solid‐State Li‐Ion Electrolytes
Author(s) -
Hamann Tanner,
Zhang Lei,
Gong Yunhui,
Godbey Griffin,
Gritton Jack,
McOwen Dennis,
Hitz Gregory,
Wachsman Eric
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201910362
Subject(s) - tortuosity , materials science , electrolyte , porosity , microstructure , conductivity , ion , fast ion conductor , percolation (cognitive psychology) , electrical resistivity and conductivity , composite material , electrode , chemistry , organic chemistry , neuroscience , biology , electrical engineering , engineering
3D focused ion beam tomography is used to analyze the microstructures of Li‐ion conducting Li 6.75 La 2.75 Ca 0.25 Zr 1.5 Nb 0.5 O 12 (LLCZN) garnet porous electrolytes with different levels of porosity and the theoretical effective bulk conductivities of the electrolyte are calculated based on LLCZN volume fraction, constriction factor, geometric tortuosity, and percolation factor. The experimentally measured effective bulk conductivities are consistently lower than the theoretical values when assuming constant bulk conductivity, suggesting the bulk conductivity of the LLCZN decreased with increasing porosity. This work highlights the importance of understanding the full effects of altering the microstructure of solid‐state electrolytes, as this will play a key role in advancing Li‐ion battery technology to higher energy and power densities.