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Phase-Field Investigation of Lithium Electrodeposition at Different Applied Overpotentials and Operating Temperatures
Joonyeob Jeon1,2, Gil Ho Yoon2, Tejs Vegge1
1Department of Energy Conversion and Storage, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
ACS Applied Materials & Interfaces
|March 28, 2022
Summary
Lithium metal batteries face dendrite issues. This study reveals optimal operating temperatures for lithium metal anodes, showing temperature effects depend on applied overpotential and experimental conditions.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- Lithium (Li) metal anodes offer high energy density for advanced batteries.
- Commercialization is hindered by Li dendrite formation, causing instability and short circuits.
- Understanding dendrite growth mechanisms and suppression is crucial.
Purpose of the Study:
- To investigate the correlation between applied overpotential, operating temperature, and Li dendrite formation.
- To determine the impact of these factors on dendrite height and surface tortuosity during electrodeposition.
- To clarify discrepancies in temperature-dependent studies between simulation and experimental conditions.
Main Methods:
- Utilized phase-field model simulations to analyze Li electrodeposition.
- Investigated Li metal anodes with 1 M LiPF6 in EC/DMC (1/1) electrolyte.
- Examined the influence of applied overpotential and operating temperature on dendrite morphology.
Main Results:
- Identified an optimal operating temperature for Li metal anodes that increases with applied overpotential.
- Simulations show a clear relationship between overpotential, temperature, and dendrite growth (height and tortuosity).
- Highlighted that temperature effects differ under potentiostatic (increased current) vs. galvanostatic (decreased overpotential) conditions.
Conclusions:
- Applied overpotential and operating temperature significantly influence Li dendrite formation and growth.
- An optimal temperature window exists for Li metal anodes, dependent on overpotential.
- Careful consideration of experimental conditions (galvanostatic vs. potentiostatic) is necessary when comparing temperature-dependent battery performance.
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