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Effect of the Quantity of Liquid Electrolyte on Self-Healing Electrostatic Shield Mechanism of CsPF6 Additive for Li Metal Anodes

Title
Effect of the Quantity of Liquid Electrolyte on Self-Healing Electrostatic Shield Mechanism of CsPF6 Additive for Li Metal Anodes
Authors
Yoon, ByeolheeKim, SeokWooLee, Yong MinRyou, Myung-Hyun
DGIST Authors
Lee, Yong Min
Issue Date
2019-07
Citation
ACS Omega, 4(7), 11724-11727
Type
Article
Article Type
Article
Keywords
FREE LITHIUM DEPOSITIONPERFORMANCE
ISSN
2470-1343
Abstract
We used a cesium hexafluorophosphate (CsPF6)-containing liquid electrolyte for surface-patterned Li metal anodes and confirmed that there is a synergistic improvement in the electrochemical performance such as cycle performance and rate capability. For instance, the surface-patterned Li metal maintains 91.4% of the initial discharge capacity after the 1000th cycle (C/2 = 0.8 mA cm-2 for charging, 1C for discharging). When a large quantity of the CsPF6-containing liquid electrolyte (600 μL) is used, the bare Li metal and surface-patterned Li metal are more effectively stabilized in comparison with the case where 80 μL of electrolyte is used, resulting in improved electrochemical performance. Through systematic testing, we recognize that these results are because of the self-healing electrostatic shield mechanism, which is mainly dependent on the amount of Cs+ ions. A small amount of Cs+ ions cannot effectively counteract the incoming Li+ ions because they cannot form an effective electrostatic shield on the protrusions present on the Li metal surface. Copyright © 2019 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/10947
DOI
10.1021/acsomega.9b00928
Publisher
American Chemical Society
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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