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Title: Towards high rate Li metal anodes: enhanced performance at high current density in a superconcentrated ionic liquid

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c9ta12004a· OSTI ID:1606311

Although high energy density and fast charging rates are vital for future advanced battery applications such as electric vehicles (EVs), the impact of fast charge rates is not widely investigated for key technologies such as those based on lithium metal. In this work, for the first time, Li metal deposition/dissolution in a superconcentrated ionic liquid (IL) is demonstrated at the high current densities necessary for fast charge technologies. Operation at high current is shown to enhance the cycling efficiency from 64 ± 3% at 1 mA cm-2 up to 96 ± 1% at 20 mA cm2 on a bare Ni substrate, providing a new path to enable these technologies. XPS, ToF-SIMS and SEM measurements revealed that a stable and LiF-dominated SEI, favourable nucleation and compact dendrite-free Li morphology enabled enhanced cycling efficiency at higher currents.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office; Australian Research Council
Grant/Contract Number:
AC36-08GO28308; CE140100012
OSTI ID:
1606311
Report Number(s):
NREL/JA-5K00-75576; MainId:19866; UUID:a0392d86-8517-ea11-9c2a-ac162d87dfe5; MainAdminID:8343
Journal Information:
Journal of Materials Chemistry. A, Vol. 8, Issue 7; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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