Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"solid electrolyte interphase"”.
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Quantitative Solid Electrolyte Interphase-Based Descriptors for Lithium Liquid Electrolyte Design
… This shortfall derives from parasitic Li-electrolyte reactions that lead to accumulation of inactive Li⁰ and electrolyte-derived byproducts, which result in the formation of a native solid electrolyte interphase (SEI). The SEI is an electrolyte-derived passivating layer that ideally …
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Silicon nanowire anode for lithium-ion batteries: fabrication, characterization and solid electrolyte interphase
… nanowires were relatively more reactive with electrolytes. The addition of silane additive results in more OPFx compounds and Si-O-Si bonds at the silicon surface with significantly higher capacities (3287 mAh·g-1). AFM nano-indentation analyses also showed a significant increase in contact …
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Understanding the Solid Electrolyte Interphase Formed on Si Anodes in Lithium Ion Batteries
… is to reveal the chemical structures of the solid-liquid interphase in lithium ion batteries by NMR spectroscopy in order to understand the working mechanism of electrolyte additives for achieving stable cycling performance. In the first part, a combination of solution and solid-state NMR …
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Single-component Li₂O solid electrolyte interphase on lithium : probing transport properties in battery environments
… chemically inhomogeneous nature of the native solid electrolyte interphase (SEI), which impedes smooth Li plating and leads to dendrite growth. In spite of much attention paid to engineering Li interfaces of late, there is still limited understanding of the desired chemical composition of an …
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Chemistry, Transport and Function of Ionic Phases in the Solid Electrolyte Interphase on Lithium Metal Anodes
Lithium (Li) metal anodes in liquid electrolytes suffer low Coulombic efficiency (< 99.9%) arising from the chemically inhomogeneous nature of the native solid electrolyte interphase (SEI), which impedes smooth Li plating and leads to excessive electrolyte consumption. Despite much attention paid …
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Three-dimensional electronic resistivity mapping of solid electrolyte interphase and anode active material in lithium-ion batteries
… C and Si anodes, electronic resistivity of the solid-electrolyte interphase (SEI) layer is a critical factor for preventing continuous electrolyte decomposition reactions at the electrode/electrolyte interface. Moreover, the degradation of electronic conductivity of Si active material through …
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Identifying interface-dominated behavior and cell configuration effects on the electrochemistry of calcium foil anodes
… When Ca metal comes in contact with an organic electrolyte, a native solid electrolyte interphase (SEI) forms which dramatically alters the electrode, and in some instances fully passivates it. Considering that Ca deposition and dissolution is widely believed to be a surface-film-controlled …
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Lithium deposition and stripping in solid-state battery via coble creep
Solid-state Li metal batteries require accommodation of electrochemically generated mechanical pressure inside Li metal. In this thesis it shows, through in situ transmission electron microscopy experiment of Li and Na deposition/stripping in mixed ionic-electronic conductor (MIEC) hollow tubules, …
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Diffusional lithium trapping as a failure mechanism of aluminum foil anodes in lithium-ion batteries
… poor cyclability arising from pulverization and solid-electrolyte interphase growth. We show in this thesis that significant capacity degradation of aluminum foil anodes during electrochemical cycling also occurs due to diffusional lithium trapping. Scanning electron microscopy of …
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The Incorporation of Graphene to Lithium Cobalt Oxide as a Cathode to Improve the Performance of Lithium Ion Batteries
… objective was to impede the construction of a solid electrolyte interphase (SEI) sheet using graphene sheet coating on its cathode. </p> <p>The results of this work show that adding graphene powder improved the performance of LiCoO¬2 as a cathode material. With the incorporation of different …
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Spatially resolved ionic measurements with scanning electrochemical microscopy
… probes by separating ionic activity from solid electrolyte interphase (SEI) development processes at an operating model battery anode. Ongoing and future applications for the probes and methods generated by this research include multi-ion measurements, cathode studies, and localized …
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Understanding electronic structure and interfaces of positive electrodes for lithium ion batteries
… One of the key parameters to study is electrode/electrolyte interface of electrodes. EEI on the negative electrode, also known as Solid Electrolyte Interphase (SEI) has the well-known structure with organic and inorganic compounds. Although EEI on negative electrodes is well known, it is not the …
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In-situ Polymerization of Methacrylate based Solid Polymer Electrolyte for Solid State Lithium-ion Batteries
… are the need of the hour. Conventional liquid electrolyte batteries for LIBs may pose a safety hazard due to the use of flammable organic electrolytes with high vapor pressure. Solid state batteries (SSB) may become a solution to this problem if they mitigate the flammability issue and offer …
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Deep understanding of degradation in lithium ion batteries through experimental and first-principles study
… which include transition metal dissolution, solid electrolyte interphase (SEI) layer formation, and mechanical fracture. To address these issues, applying an ultrathin coating onto active materials via Atomic Layer Deposition (ALD) is an efficient way. Although numerious works have been done …
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Analysis and Chemical Applications of Metal–Metal Bonds and Large Language Models
… was introduced into a NaPF₆/dimethyl carbonate electrolyte to improve sodium metal battery performance. This strategy addressed persistent issues with interfacial instability and dendritic growth, promoting the formation of a more uniform and stable solid electrolyte interphase and enabling …
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Understanding Transition Metal Dissolution from Battery Materials with Solution NMR Methods
… dissolution of the transition metal(s) into the electrolyte solution. Transition metal dissolution can lead to cathode restructuring, electrolyte degradation, thickening of the anode solid electrolyte interphase, and loss of lithium from the active lithium inventory, ultimately causing battery …
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Non-equilibrium thermodynamics in porous media : battery degradation, and sorption and transport in porous materials
… batteries is the loss of cyclable lithium to a solid-electrolyte interphase layer on the surface of the negative electrode. I develop a single-particle model of this fade mechanism, based on diffusion of the reacting species through the growing layer and reaction at the surface of the active …
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Design Guidelines for Sulfonyl/Sulfamoyl Fluoride Additives to Modulate Lithium Anode Coulombic Efficiency
… However, the high reactivity of Li metal with electrolytes results in the formation of a solid electrolyte interphase (SEI). In conventional electrolytes, the SEI is unstable, leading to continuous capacity loss and low Coulombic efficiencies (CE). Successful principles for Li metal electrolyte …
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Elucidation of Battery Electrolyte Coordination Sphere Thermodynamics via Calorimetric and Potentiometric Titrations
… the high reactivity of metallic anodes with the electrolyte results in the formation of a solid-electrolyte interphase (SEI). Electrolyte design is a key handle in controlling the SEI composition in metal-anode batteries, but our understanding of the electrolyte—specifically the cation’s first …
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