Global ETD Search
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Showing 1 to 14 of 14 for “"Electrolyte decomposition"”.
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Understanding the pathway and mechanism of electrolyte decomposition on metal oxide surfaces in Li-ion batteries by in situ Fourier Transform Infrared Spectroscopy
… (electro)chemical reactions at the electrode-electrolyte interface (EEI) is crucial to promote the cycle life of lithium-ion batteries. In situ studies of EEI can provide new insights into reaction intermediates and soluble species not accessible by ex situ characterization of electrode …
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Three-dimensional electronic resistivity mapping of solid electrolyte interphase and anode active material in lithium-ion batteries
… 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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Understanding the Chemistries of Ni-rich Layered Oxide Materials for Applications in Lithium Batteries and Catalysis
… oxygen loss, and undesirable oxide cathode-electrolyte interfacial reactions. Each of these phenomena contribute to complex electrolyte decomposition pathways and oxide cathode structural distortions. Structural instability leads to poor battery performance metrics including specific …
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NMR Studies of Interfacial Reactions in Lithium-Ion Batteries
… the electrodes (positive and negative) and the electrolyte solution, is essential for enabling longer lasting lithium-ion batteries. In this work, solution- and solid-state nuclear magnetic resonance (NMR) methodologies are developed for studying the electrode-electrolyte reactions. The …
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… ATR FTIR allows investigations of battery electrolytes in realistic geometries and at high C-rates. A novel operando spectro-electrochemical cell has been demonstrated. ATR FTIR spectroscopy was used for operando measurements of polysulfide dissolution in Li-S batteries, which leads to loss …
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Investigation of oxidation in nonaqueous lithium-air batteries
… volatility and poor oxygen conduction of liquid electrolytes in Li-air batteries. In the first part, Vulcan carbon-based electrodes were developed where chemically-synthesized lithium peroxide was included during the electrode preparation process. Variants of these electrodes which further …
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The Sodium-O2/Co2 Electrochemical Cell
… cell provided steps are taken to prevent electrolyte decomposition during the recharge. In the current work, we studied electrochemical processes in model sodiumO2/CO2 (Na-O2/CO2) cells. We find that provided that with the formation of the electrochemically stable electrode/electrolyte …
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Development of Electrolyte Salts for Multivalent Ion Batteries
… the synthesis and electrochemical testing of new electrolyte salts for rechargeable multivalent ion batteries. In chapters 2 and 3 the synthesis of Mg and Ca hexafluoropnictogenate salts as well as the electrochemical behaviour of Mg(PF6)2 is presented. Pure samples of Mg(EF6)2 (E = P, As, and Sb) …
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Ab initio prediction of thermodynamics in alkali metal-air batteries
… the cause of the high overpotentials and electrolyte decomposition and to search for better cathode/electrolyte/anode and/or catalyst material combinations. However, Li-O₂ battery technology remains in its infancy primarily due to the lack of understanding of the underlying mechanisms. …
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Fundamental understanding and design principles of oxide/metal surfaces for lithium storage
… batteries. The criteria for efficient electrode-electrolyte interfaces for Li-ion batteries were identified by examining the working mechanism of "AlPO4" nanoparticle coatings on enhancing the cycle life and energy efficiency of LiCoO2 batteries. SEM, XRD and XPS revealed that the "AlPO4" …
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Mechanics of lithium-ion battery electrodes
… of new anode and cathode materials and new electrolytes, a more complete understanding of in situ and artificial interfacial stabilization processes at the electrode / electrolyte interface, and strategies to mitigate combined electro-chemo-mechanical degradation of the batteries resulting …
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In situ studies of surface reactions affecting Li-ion battery failure
… the interfaces between the cell components and electrolyte where so-called side reactions occur; such as Li trapping in non-active regions, loss of active electrode material, gas evolution, electrolyte decomposition, and chemical reactions with packaging and current collectors. Particular side …
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Advanced Materials for High-Energy Rechargeable Batteries: Borate Polyanion Cathodes and Silicon Anodes
… side reaction involving hydrofluoric acid in the electrolyte and the Fe impurity, rather than true Mg²⁺ intercalation. In Chapter 5, the electrochemical properties of all five synthesised borates are evaluated, with a particular focus on the phase-pure orthoborate Mg₂Mn(BO₃)₂. All materials …
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NMR Studies of the Electronic Structure, Lithium-Ion Dynamics, and Prelithiation of Lithium-Ion Battery Anode Materials
… and electrode fracture, leading to continuous electrolyte decomposition at the electrode surface, forming an SEI. This results in irreversible consumption of Li, impedance increase, and capacity fading. Carbon coatings and additives can enhance cyclability, as well as the electrical …