Multivalent Intercalation
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Simulations of Anodic Nanopore Growth Using the Smoothed Boundary and Level Set Methods
A new numerical approach for simulating the growth of nanopores during the anodization (electrochemical oxidation) of aluminum was developed, allowing the multidimensional extension of a successful one-dimensional model with a series of interfacial. Simulations indicate that anions adsorbed to the alumina surface play a significant role in the growth and morphology of the nanopores. Read More
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Computational Examination of Orientation-Dependent Morphological Evolution during the Electrodeposition and Electrodissolution of Magnesium
A new model of electrodeposition was developed that includes crucial phenomena required to simulate Mg battery anode cycling and yields results that are consistent with experimental observations. Read More
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Reversible Magnesium Intercalation into a Layered Oxyfluoride Cathode
Magnesium was reversibly intercalated at room temperature into an oxyfluoride cathode without the co-intercalation of electrolytes or protons and without the formation of unwanted side-products that commonly plague oxide cathodes. Read More
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Phase-Controlled Electrochemical Activity of Epitaxial Spinel Thin films as Mg-Cathodes
Epitaxial thin film cathodes of MgMn2O4 (“MMO”) are stabilized in two distinct phases (tetragonal vs. cubic) which reveal distinct electrochemical activities for reversible Mg2+ insertion. Read More
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The First Ca-ion Rechargeable Battery
We have demonstrated the first ever rechargeable battery utilizing calcium as the working ion. Read More
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Current Collector Corrosion in Ca-Ion Batteries
This study identified and verified corrosion of the metallic current collectors in a series of multivalent electrolyte/electrode systems; calcium based systems were shown to be particularly susceptible to corrosion. Read More
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Demonstration of Magnesium Intercalation into a High-Voltage Oxide Electrode
First demonstration of reversible insertion of multivalent magnesium ions (Mg2+) into a spinel-type manganese oxide (Mn2O4), using multi-modal characterization Read More
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Understanding the Initial Stages of Reversible Mg Deposition and Stripping in Inorganic Nonaqueous Electrolytes
The chemical species at the Mg-anode surface in the presence of Magnesium Aluminum-Chloro complex (MACC) electrolyte were identified. While solvent molecules (THF and DME) are loosely bound at the Mg(0001) surface, the constituents of the MACC electrolyte (e.g. MgCl+, see diagram) are strongly anchored at the electrode. Read More
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A Lewis Acid-free and Phenolate-based Magnesium Electrolyte for Rechargeable Magnesium Batteries
A novel Lewis acid-free all magnesium electrolyte containing 2,6-di-tert-butylphenoxidemagnesium chloride ((DTBP)MgCl + MgCl2) has been deliberately developed. The obtained electrolyte possesses the oxidative stability of up to 2.3 V (vs Mg/Mg2+) with 100% coulombic efficiency, which is comparable to its AlCl3 counterpart. Read More
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Electrolyte Genome Reveals New Instability Mechanism in Mg Electrolytes
imulations of a matrix of Mg salt and solvent combinations revealed a strong tendency to ion pair formation. Close association of the salt anion and cation within the first solvation shell, even at modest concentrations. 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
