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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Architecture-Controlled Ring-Opening Polymerization for Dynamic Covalent Poly(disulfide)s
We reported a strategy to access different topologies of redox-active poly(disulfide)s by ring-opening polymerization. Control over polymerization enables synthesis of high molecular-weight polymers. The polymers undergo catalytic depolymerization to recycle monomer; a promising feature for sustainable flow batteries. Read More
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Adsorption and Thermal Decomposition of Electrolytes on Nanometer Magnesium Oxide: An in Situ 13C MAS NMR Study
The structural and chemical evolution of electrolyte constituents at the nanometric MgO surface were identified, providing a fundamental understanding of heterogeneous interphase evolution. Read More
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Mechanism-Based Design of a High-Potential Catholyte Enables a 3.2 V All-Organic Nonaqueous Redox Flow Battery
Development of an extremely high-potential catholyte leads to the first 3.2 V all-organic flow battery. Read More
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Shedding X‑ray Light on the Interfacial Electrochemistry of Silicon Anodes for Li-Ion Batteries
Our results shed light on the interfacial electrochemistry of silicon anodes for Lithium-ion batteries (LiBs), providing important mechanistic insight into nanometer scale phenomena and how these influence battery performance. Read More
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Accelerating Electrolyte Discovery for Energy Storage through Machine Learning
Utilized high performance computing to generate a database of highly accurate quantum chemical energies of 133 K organic molecules and used machine learning to enable prediction of energies from low fidelity, low cost quantum chemical calculations. Read More
