Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Effects of Applied Interfacial Pressure on Li-Metal Cycling Performance and Morphology in 4 M LiFSI in DME

Journal Article · · ACS Applied Materials and Interfaces

Lithium-metal anodes can theoretically enable 10x higher gravimetric capacity than conventional graphite anodes. However, Li-metal anode cycling has proven difficult due to porous and dendritic morphologies, extensive parasitic solid electrolyte interphase reactions, and formation of dead Li. We systematically investigate the effects of applied interfacial pressure on Li-metal anode cycling performance and morphology in the recently developed and highly efficient 4 M lithium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane electrolyte. We present cycling, morphology, and impedance data at a current density of 0.5 mA/cm2 and a capacity of 2 mAh/cm2 at applied interfacial pressures of 0, 0.01, 0.1, 1, and 10 MPa. Cryo-focused ion beam milling and cryo-scanning electron microscopy imaging in cross section reveal that increasing the applied pressure during Li deposition from 0 to 10 MPa leads to greater than a fivefold reduction in thickness (and therefore volume) of the deposited Li. This suggests that pressure during cycling can have a profound impact on the practical volumetric energy density for Li-metal anodes. A “goldilocks zone” of cell performance is observed at intermediate pressures of 0.1–1 MPa. Increasing pressure from 0 to 1 MPa generally improves cell-to-cell reproducibility, cycling stability, and Coulombic efficiency. However, the highest pressure (10 MPa) results in high cell overpotential and evidence of soft short circuits, which likely result from transport limitations associated with increased pressure causing local pore closure in the separator. All cells exhibit at least some signs of cycling instability after 50 cycles when cycled to 2 mAh/cm2 with thin 50 μm Li counter electrodes, though instability decreases with increasing pressure. In contrast, cells cycled to only 1 mAh/cm2 perform well for 50 cycles, indicating that capacity plays an important role in cycling stability.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1810402
Report Number(s):
SAND--2021-8908J; 697419
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 27 Vol. 13; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (68)

A Mechanically Robust and Highly Ion-Conductive Polymer-Blend Coating for High-Power and Long-Life Lithium-Ion Battery Anodes journal November 2014
Lithium-Sulfur Cells: The Gap between the State-of-the-Art and the Requirements for High Energy Battery Cells journal April 2015
Flexible Ion-Conducting Composite Membranes for Lithium Batteries journal May 2015
Accurate Determination of Coulombic Efficiency for Lithium Metal Anodes and Lithium Metal Batteries journal October 2017
In-situ study of electrode stack growth in rechargeable cells at constant pressure journal August 1993
Effects of physical constraints on Li cyclability journal December 1991
Progress and prospective of solid-state lithium batteries journal February 2013
Mechanical properties of metallic lithium: from nano to bulk scales journal March 2020
Lithium metal stripping/plating mechanisms studies: A metallurgical approach journal October 2006
Effect of vinylene carbonate as additive to electrolyte for lithium metal anode journal February 2004
Stress evolution in lithium metal electrodes journal January 2020
Planting CuGa2 seeds assisted with liquid metal for selective wrapping deposition of lithium journal May 2021
Nonlinear aging of cylindrical lithium-ion cells linked to heterogeneous compression journal February 2016
Preventing lithium ion battery failure during high temperatures by externally applied compression journal October 2017
Characterizing the Li-Solid-Electrolyte Interface Dynamics as a Function of Stack Pressure and Current Density journal September 2019
A review on electrolyte additives for lithium-ion batteries journal November 2006
Lithium bis(fluorosulfonyl)imide (LiFSI) as conducting salt for nonaqueous liquid electrolytes for lithium-ion batteries: Physicochemical and electrochemical properties journal April 2011
The role of mechanically induced separator creep in lithium-ion battery capacity fade journal October 2011
Suppressed lithium dendrite growth in lithium batteries using ionic liquid electrolytes: Investigation by electrochemical impedance spectroscopy, scanning electron microscopy, and in situ 7Li nuclear magnetic resonance spectroscopy journal April 2013
Non-uniform aging of cycled commercial LiFePO4//graphite cylindrical cells revealed by post-mortem analysis journal July 2014
Lithium plating in a commercial lithium-ion battery – A low-temperature aging study journal February 2015
Effects of external pressure on the performance and ageing of single-layer lithium-ion pouch cells journal May 2018
Sericin protein as a conformal protective layer to enable air-endurable Li metal anodes and high-rate Li-S batteries journal April 2019
Liquid cell transmission electron microscopy observation of lithium metal growth and dissolution: Root growth, dead lithium and lithium flotsams journal February 2017
Recent advances in all-solid-state rechargeable lithium batteries journal March 2017
Insights into morphological evolution and cycling behaviour of lithium metal anode under mechanical pressure journal August 2018
Pressure-Driven Interface Evolution in Solid-State Lithium Metal Batteries journal February 2020
Microstructure and Pressure-Driven Electrodeposition Stability in Solid-State Batteries journal January 2021
Use of a Be-dome holder for texture and strain characterization of Li metal thin films via sin 2 ( ψ ) methodology journal June 2020
Toward a Fundamental Understanding of the Lithium Metal Anode in Solid-State Batteries—An Electrochemo-Mechanical Study on the Garnet-Type Solid Electrolyte Li 6.25 Al 0.25 La 3 Zr 2 O 12 journal March 2019
Efficient Lithium Metal Cycling over a Wide Range of Pressures from an Anion-Derived Solid-Electrolyte Interphase Framework journal February 2021
Next-Generation Lithium Metal Anode Engineering via Atomic Layer Deposition journal May 2015
Lithium Self-Discharge and Its Prevention: Direct Visualization through In Situ Electrochemical Scanning Transmission Electron Microscopy journal September 2017
Effects of Cesium Cations in Lithium Deposition via Self-Healing Electrostatic Shield Mechanism journal February 2014
Issues and challenges facing rechargeable lithium batteries journal November 2001
High rate and stable cycling of lithium metal anode journal February 2015
Making Li-metal electrodes rechargeable by controlling the dendrite growth direction journal June 2017
Interconnected hollow carbon nanospheres for stable lithium metal anodes journal July 2014
Reviving the lithium metal anode for high-energy batteries journal March 2017
Status and challenges in enabling the lithium metal electrode for high-energy and low-cost rechargeable batteries journal December 2017
Pathways for practical high-energy long-cycling lithium metal batteries journal February 2019
High-energy lithium metal pouch cells with limited anode swelling and long stable cycles journal May 2019
Long cycle life and dendrite-free lithium morphology in anode-free lithium pouch cells enabled by a dual-salt liquid electrolyte journal July 2019
Diagnosing and correcting anode-free cell failure via electrolyte and morphological analysis journal August 2020
Origin of lithium whisker formation and growth under stress journal October 2019
Quantifying inactive lithium in lithium metal batteries journal August 2019
Effect of nanopatterning on mechanical properties of Lithium anode journal February 2018
The critical role of lithium nitrate in the gas evolution of lithium–sulfur batteries journal January 2016
Dead lithium: mass transport effects on voltage, capacity, and failure of lithium metal anodes journal January 2017
Cycling behaviour of Li/Li4Ti5O12 cells studied by electrochemical impedance spectroscopy journal January 2011
Metallic anodes for next generation secondary batteries journal January 2013
Quantifying the promise of lithium–air batteries for electric vehicles journal January 2014
Self-heating–induced healing of lithium dendrites journal March 2018
A Study of Capacity Fade in Cylindrical and Prismatic Lithium-Ion Batteries journal January 2001
The Surface Film Formed on a Lithium Metal Electrode in a New Imide Electrolyte, Lithium Bis(perfluoroethylsulfonylimide) [LiN(C[sub 2]F[sub 5]SO[sub 2])[sub 2]] journal January 1999
Influence of Electrolyte on Lithium Cycling Efficiency with Pressurized Electrode Stack journal January 1994
Effect of Additives on Lithium Cycling Efficiency journal January 1994
The Importance of Interphase Contacts in Li Ion Electrodes: The Meaning of the High-Frequency Impedance Arc journal January 2008
High Energy Rechargeable Li-S Cells for EV Application: Status, Remaining Problems and Solutions conference January 2010
Exploring the Impact of Mechanical Pressure on the Performance of Anode-Free Lithium Metal Cells journal January 2019
Lithium Mechanics: Roles of Strain Rate and Temperature and Implications for Lithium Metal Batteries journal January 2019
Stress Evolution in Lithium-Ion Composite Electrodes during Electrochemical Cycling and Resulting Internal Pressures on the Cell Casing journal January 2015
Critical Link between Materials Chemistry and Cell-Level Design for High Energy Density and Low Cost Lithium-Sulfur Transportation Battery journal January 2015
Rethinking How External Pressure Can Suppress Dendrites in Lithium Metal Batteries journal January 2019
Symmetrical Impedance Study on Inactivation Induced Degradation of Lithium Electrodes for Batteries Beyond Lithium-Ion journal January 2014
Effects of Carbonate Solvents and Lithium Salts on Morphology and Coulombic Efficiency of Lithium Electrode journal January 2013
Investigation of Electronic Resistance in Lithium-Ion Batteries by AC Impedance Spectroscopy journal January 2017
Nanoindentation of high-purity vapor deposited lithium films: A mechanistic rationalization of diffusion-mediated flow journal May 2018