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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Tailoring Solution-Processable Li Argyrodites Li6+xP1-xMxS5I (M = Ge, Sn) and Their Microstructural Evolution Revealed by Cryo-TEM for All-Solid-State Batteries

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Title
Tailoring Solution-Processable Li Argyrodites Li6+xP1-xMxS5I (M = Ge, Sn) and Their Microstructural Evolution Revealed by Cryo-TEM for All-Solid-State Batteries
Author
Song, Yong BaeKim, Dong HyeonKwak, HiramHan, DaseulKang, SujinLee, Jong HoonBak, Seong-MinNam, Kyung-WanLee, Hyun-WookJung, Yoon Seok
Issue Date
2020-06
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.20, no.6, pp.4337 - 4345
Abstract
Owing to their high Li+ conductivities, mechanical sinterability, and solution processability, sulfide Li argyrodites have attracted much attention as enablers in the development of high-performance all-solid-state batteries with practicability. However, solution-processable Li argyrodites have been developed only for a composition of Li6PS5X (X = Cl, Br, I) with insufficiently high Li+ conductivities (similar to 10(-4) S cm(-1)). Herein, we report the highest Li+ conductivity of 0.54 mS cm(-1) at 30 degrees C (Li6.5P0.5Ge0.5S5I) for solution-processable iodine-based Li argyrodites. A comparative investigation of three iodine-based argyrodites of unsubstituted and Ge- and Sn-substituted solution-processed Li6PS5I with varied heat-treatment temperature elucidates the effect of microstructural evolution on Li+ conductivity. Notably, local nanostructures consisting of argyrodite nanocrystallites in solution-processed Li6.5P0.5Ge0.5S5I have been directly captured by cryogenic transmission electron microscopy, which is a first for sulfide solid electrolyte materials. Specifically, the promising electrochemical performances of all-solid-state batteries at 30 degrees C employing LiCoO2 electrodes tailored by the infiltration of Li6.5P0.5Ge0.5S5I-ethanol solutions are successfully demonstrated.
URI
https://scholarworks.unist.ac.kr/handle/201301/36792
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.0c01028
DOI
10.1021/acs.nanolett.0c01028
ISSN
1530-6984
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