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Behavior of Lithium Metal Anodes under Various Capacity Utilization and High Current Density in Lithium Metal Batteries

Journal Article · · Joule
Lithium (Li) metal batteries (LMBs) are regarded as the most promising power sources for electric vehicles. Besides the Li dendrite growth and low Li Coulombic efficiency, how to well match Li metal anode with a high loading (normally over 3.0 mAh cm-2) cathode is another key challenge to achieve the real high energy density battery. In this work, we systematically investigate the effects of the Li metal capacity usage in each cycle, manipulated by varying the cathode areal loading, on the stability of Li metal anode and the cycling performance of LMBs using the LiNi1/3Mn1/3Co1/3O2 (NMC) cathode and an additive-containing dual-salt/carbonate-solvent electrolyte. It is demonstrated that the Li||NMC cells show decent long-term cycling performance even with NMC areal capacity loading up to ca. 4.0 mAh cm-2 and at a charge current density of 1.0 mA cm-2. The increase of the Li capacity usage in each cycle causes variation in the components of the solid electrolyte interphase (SEI) layer on Li metal anode and generates more ionic conductive species from this electrolyte. Further study reveals for the first time that the degradation of Li metal anode and the thickness of SEI layer on Li anode show linear relationship with the areal capacity of NMC cathode. Meanwhile, the expansion rate of consumed Li and the ratio of SEI thickness to NMC areal loading are kept almost the same value with increasing cathode loading, respectively. These fundamental findings provide new perspectives on the rational evaluation of Li metal anode stability for the development of rechargeable LMBs.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1421329
Report Number(s):
PNNL-SA-125205; 49321; 48379; VT1201000
Journal Information:
Joule, Journal Name: Joule Journal Issue: 1 Vol. 2; ISSN 2542-4351
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Langmuir–Blodgett artificial solid-electrolyte interphases for practical lithium metal batteries journal September 2018
Lithiophilic-lithiophobic gradient interfacial layer for a highly stable lithium metal anode journal September 2018
Exploring Self-Healing Liquid Na-K Alloy for Dendrite-Free Electrochemical Energy Storage journal October 2018
Electrochemical Diagram of an Ultrathin Lithium Metal Anode in Pouch Cells journal July 2019
Cross Talk between Transition Metal Cathode and Li Metal Anode: Unraveling Its Influence on the Deposition/Dissolution Behavior and Morphology of Lithium journal April 2019
A Lithium-Sulfur Battery using a 2D Current Collector Architecture with a Large-Sized Sulfur Host Operated under High Areal Loading and Low E/S Ratio journal October 2018
Deterioration Analysis of Lithium Metal Anode in Full Cell during Long-Term Cycles journal January 2019
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Stabilizing Lithium into Cross-Stacked Nanotube Sheets with an Ultra-High Specific Capacity for Lithium Oxygen Batteries journal January 2019
Towards high energy density lithium battery anodes: silicon and lithium journal January 2019
Enhanced Stability of Lithium Metal Anode by using a 3D Porous Nickel Substrate journal February 2018
Graphitic Carbon Nitride (g‐C 3 N 4 ): An Interface Enabler for Solid‐State Lithium Metal Batteries journal January 2020

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