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Title: Lithium metal stripping beneath the solid electrolyte interphase

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [2];  [3]
  1. Stanford Univ., Stanford, CA (United States)
  2. Univ. of Electronic Science and Technology of China, Sichuan (People's Republic of China)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Lithium stripping is a crucial process coupled with lithium deposition during the cycling of Li metal batteries. Lithium deposition has been widely studied, whereas stripping as a subsurface process has rarely been investigated. Here we reveal the fundamental mechanism of stripping on lithium by visualizing the interface between stripped lithium and the solid electrolyte interphase (SEI). We observed nanovoids formed between lithium and the SEI layer after stripping, which are attributed to the accumulation of lithium metal vacancies. High-rate dissolution of lithium causes vigorous growth and subsequent aggregation of voids, followed by the collapse of the SEI layer, i.e., pitting. We systematically measured the lithium polarization behavior during stripping and find that the lithium cation diffusion through the SEI layer is the rate-determining step. Nonuniform sites on typical lithium surfaces, such as grain boundaries and slip lines, greatly accelerated the local dissolution of lithium. As a result, the deeper understanding of this buried interface stripping process provides beneficial clues for future lithium anode and electrolyte design.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1476112
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 34 Vol. 115; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English

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Uniform High Ionic Conducting Lithium Sulfide Protection Layer for Stable Lithium Metal Anode journal April 2019
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Depressing the irreversible reactions on a three-dimensional interface towards a high-areal capacity lithium metal anode journal January 2019
Li-diffusion at the interface between Li-metal and [Pyr 14 ][TFSI]-ionic liquid: Ab initio molecular dynamics simulations journal January 2020
Electrochemical Kinetics of SEI Growth on Carbon Black: Part I. Experiments journal January 2019
Electrochemical Kinetics of Lithium Plating and Stripping in Solid Polymer Electrolytes: Pulsed Voltammetry journal January 2019