Chemical Transformation
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The Effect of Hydrofluoroether Addition on S8 Reduction and the Li+ Solvation Structure in the Solvate Electrolyte
The hydrofluoroether, TTE, competes with MeCN coordination to Li+ in the solvate electrolyte resulting in a higher free MeCN content as TTE is added. The content of free MeCN affects S8 reduction kinetics likely through facilitation of polysulfide formation and enhanced local solvation effects. Read More
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Dendrites and Pits: Untangling the Complex Behavior of Lithium Metal Anodes through Operando Video Microscopy
A mechanistic understanding of the complex cycling behavior of Li metal anodes has been gained by combining operando video microscopy with continuum-scale modeling of Li/Li symmetric cells. Read More
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Sparingly Solvating Electrolytes for High Energy Density Lithium-Sulfur Batteries
As JCESR scientists work to develop lighter and less expensive chemistries than those used in current lithium-ion batteries, lithium-sulfur shows tremendous promise. This perspective presents an alternate approach that could move us closer to long-lived, high energy density lithium-sulfur batteries. Read More
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Sparingly Solvating Electrolytes for High Energy Density Lithium-Sulfur Batteries
This work presents the promising new concepts of using sparingly solvating electrolyte to enable Li-S battery operation at lean electrolyte condition, as well as the design rules for discovering new electrolyte systems. Read More
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Ammonium Additives to Dissolve Li2S through Hydrogen Binding for High Energy Li-S Batteries
Ammonium salts are demonstrated as effective additives to promote the dissolution of Li2S (up to concentrations of 1.25 M) in DMSO solvent at room temperature through hydrogen binding between N-H groups and S2- anions. Read More
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Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries
Discovered why the salt LiTFSI -- when added to the electrolyte of a Li-S battery -- allows the battery to hold a charge much longer than other salts Read More
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Restricting the Solubility of Polysulfides in Li-S Batteries Via Electrolyte Salt Selection
Lithium 2-trifluoromethyl-4,5-dicyanoimidazole (LiTDI) as a supporting salt in electrolytes suppresses the maximum solubility of Li2S8 by forming a Li4S8 dimer rather than the Li2S3 and Li2S5 observed in a LiTFSI electrolyte, which enables a cell with a high sulfur loading (3 mg-S cm-2) to deliver a 1.67 mAh cm-2 areal capacity after 300 stable cycles at a high current density (2.4 mA cm-2). Read More
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In situ 7Li and 133Cs NMR Investigations of the Role of Cs+ Additive in Lithium-Metal Deposition Processes
Insights are obtained into the mechanisms of adding Cs+ to protect the Li-metal electrode during battery cycling. Read More
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Redox Mediators that Promote Three-Dimensional Growth of Li2S on Carbon Current Collectors in Lithium-Sulfur Batteries
Developed, from computation and experiment, redox mediators that allow 3-D growth of Li2S on carbon current collectors for greater capacity utilization in Li-S batteries Read More
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Compliant Glass–Polymer Hybrid Single Ion-Conducting Electrolytes for Lithium Batteries
We have successfully developed non-flammable hybrid single-ion-conducting electrolytes comprising inorganic sulfide glass particles covalently bonded to a perfluoropolyether polymer. These electrolytes present high transference numbers, unprecedented ionic conductivities at room temperature, excellent electrochemical stability, and limit the dissolution of lithium polysulfides. Read More
Latest Updates
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JCESR Spotlight: Bob Jin Kwon, A Postdoc with Passion and Perseverance
Argonne recognizes Kwon’s contributions to battery science with the Postdoctoral Performance Award. Article authored by: Michael Matz, Argonne Associate Bob Jin Kwon likes a good challenge, particularly when it comes to developing completely new kinds of batteries. “Developing new battery technologies is very challenging,” said … Read More
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JCESR Spotlight: Lily Robertson Recognized for Her Contributions to Battery Research
Argonne’s Postdoctoral Performance Award recognizes scientific achievements, leadership, and collaboration. Article authored by: Michael Matz, Argonne Associate Since her early days growing up in the Pacific Northwest, Lily Robertson has always wanted to help make the world a better place. “For as … Read More
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Understanding fluorine-free electrolytes via small-angle X-ray scattering
We compare the solvation phenomenon of sodium tetraphenylborate (NaBPh4) salt dissolved in organic solvents of propylene carbonate (PC), 1,2-dimethoxyethane (DME), acetonitrile (ACN) and tetrahydrofuran (THF) by SAXS/WAXS measurement and MD simulation. Read More
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Navigating the Minefield of Battery Literature
This is an invited perspective aiming to help researchers new to the field of battery research to circumvent certain recurring misconceptions and inaccuracies in the current battery literature. It covers the electrolyte ideality and practical situation in batteries, the difficulty in accurately determining ion transference … Read More
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Quantifying Lithium Ion Exchange in Solid Electrolyte Interphase (SEI) on Graphite Anode Surfaces
By using Li isotopic labelling of SEIs and electrolytes followed by time-of-flight secondary-ion mass spectroscopy and solid-state NMR analyses, we found that the majority of Li+ “immobilized” in the chemical ingredients were exchanged after 1 SEI formation cycle. Ion exchange by diffusion based on concentration … Read More
