Chemical Transformation
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Understanding and Manipulating Solution Chemistry of Polysulfides for Lithium Sulfur Batteries
The factors that govern the solubility of various polysulfides were identified. LiTf with strong ionic association strength increases the solubility of short-chain species significantly. A solution Li-S flow cell was demonstrated using LiTf as additive in the polysulfide catholyte. Read More
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Dendrite-Free Li Deposition Using Trace-Amounts of Water as an Electrolyte Additive
Residual water (H2O) present in nonaqueous electrolytes has been widely regarded as a detrimental factor for lithium (Li) batteries. However, dendrite-free Li film can be obtained with trace H2O as an electrolyte additive. Read More
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Anodes for Rechargeable Lithium-Sulfur Batteries
Recent developments on the protection of the Li metal anode in Li-S batteries are reviewed Read More
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Direct Observation of the Redistribution of Sulfur and Polysufides in Li-S Batteries by In Situ X-Ray Fluorescence Microscopy
The dissolution and redistribution of sulfur and polysulfides were directly observed by XRF imaging. The long-chain polysulfides were generated as soon as discharge was initiated. The dissolved polysulfide diffused to the anode side and deposited onto (and reacted with) lithium metal. Read More
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Following the Transient Reactions in Lithium-Sulfur Batteries Using an In Situ Nuclear Magnetic Resonance (NMR) Technique
First in situ NMR characterization of the full cell electrochemical reactions in Li-S batteries using a microbattery design Read More
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Direct Observation of SEI and Dendrite Dynamics by Operando Electrochemical Scanning Transmission Electron Microscopy
Implemented “battery in a STEM” - an operando electrochemical stage inside an Cs-corrected scanning transmission electron microscope (STEM) Read More
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Molecular‐Confinement of Polysulfide within HybridElectrodes for High Mass Loading in Lithium Sulfur Batteries
N-doped carbon stabilizes the S3 radicals, which are rarely detected in ether-based electrolyte due to their high reactivity; this also restrains the polysulfide loss during battery cycling. Read More
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First-Principles Study of Redox End-Members in Li-Sulfur Batteries
Van der Waals-augmented density functional theory (vdW-DF), quasi-particle methods (G0W0), and continuum solvation techniques were used to predict several structural, thermodynamic, spectroscopic, electronic, and surface characteristics of solid-phase redox end-members in Li-S batteries. Read More
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A Highly Active Nanostructured Metallic Oxide Cathode for Li-O2 Batteries
Synthesis of a low-cost nanocrystalline metallic metal oxide that shows very good ORR/OER properties in a Li-O2 cell, highlighting the importance of controlling the cathode interface to achieve better round-trip efficiency Read More
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Nanoparticle-Driven Assembly of Highly Conducting Hybrid Block Copolymer Electrolytes
The ionic conductivity of nanostructured SEO block copolymer electrolytes is closely related to the morphology 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
