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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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Stack Pressure Measurements to Probe the Evolution of the Lithium-Solid-State Electrolyte Interface

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Title
Stack Pressure Measurements to Probe the Evolution of the Lithium-Solid-State Electrolyte Interface
Author
Lee, ChanheeHan, Sang YunLewis, John A.Shetty, Pralav P.Yeh, DavidLiu, YuhgeneKlein, EmilyLee, Hyun-WookMcDowell, Matthew T.
Issue Date
2021-09
Publisher
AMER CHEMICAL SOC
Citation
ACS ENERGY LETTERS, v.6, no.9, pp.3261 - 3269
Abstract
Although solid-state batteries with lithium metal could enable higher energy density and better safety characteristics than Li-ion batteries, the complex electro-chemo-mechanical evolution of the Li-solid-state electrolyte interface can diminish performance. Here, we measure the stack pressure in real time to provide new insights into the effects of applied stack pressure and electrolyte processing on the interfacial behavior of two representative solid-state electrolytes, Li10SnP2S12 and Li6PS5Cl; these materials exhibit different degradation mechanisms through either interphase formation or Li filament growth. We find that stack pressure evolution sensitively depends on interphase formation and that tracking stack pressure coupled with impedance can distinguish between various reaction phenomena and degradation mechanisms within cells. Furthermore, Li filament growth exhibits distinct stack pressure signatures that depend on electrolyte density. The findings advance our understanding of the interfacial evolution of two important classes of solid-state electrolytes, and they demonstrate the utility of electro-chemo-mechanical measurements to understand solid-state battery behavior.
URI
https://scholarworks.unist.ac.kr/handle/201301/54131
URL
https://pubs.acs.org/doi/10.1021/acsenergylett.1c01395
DOI
10.1021/acsenergylett.1c01395
ISSN
2380-8195
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