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
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Toward the Development of a High-VoltageMg Cathode Using a Chromium Sulfide Host
The electrochemical behavior of MgM2S4 (M = Ti, Cr) thiospinels was investigated experimentally and their redox activity was understood through analysis of the computed electronic density of states. Read More
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Understanding and enhancing ion transport in a systematic series of polyacetal electrolytes
Polyacetal electrolytes can electrochemically outperform the well-established poly(ethylene oxide) systems used in Li-ion batteries. In this work, we employ a suite of experimental and theoretical techniques to reveal the underlying molecular interactions between cations, anions and the polyacetal host that lead to improved electrochemical efficacy. Read More
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A Comparative Study of Organic Radical Cation Stability and Coulombic Efficiency for Nonaqueous Redox Flow Battery Applications
The charged forms of high oxidation potential posolytes exhibited either self-discharge or a combination of self-discharge and molecular degradation, limiting CE and/or cycle lifetime in the galvanostatic cycling, presenting a challenge of utilizing high potential compounds in nonaqueous RFBs. Read More
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Employing the Dynamics of the Electrochemical Interface at Aqueous Zinc-Ion Battery Cathode
This report illustrates how dissolution, once seen as a fundamental drawback for MnO2 cathodes, can fortify capacity in AZIBs and provides guidance for expanding this concept and developing other systems that can reversibly deposit and dissolve the active material in a dynamic manner. Read More
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Understanding of electrolyte solution chemistry and interface electrochemistry of divalent metal batteries
This review discusses the design of electrolytes that involve different solvation structures related, in particular, the choice of anionic species. It focuses on the dynamic interplay of these electrolytes with interfaces as well as the electrochemistry of divalent metal anodes. Read More
