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 15 of 15 for “"capacity fading"”.
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Development Of Silicon-Based Anodes And In-Situ Characterization Techniques For Lithium Ion Batteries
… of lithium ion batteries (LIBs) with higher capacity has been booming worldwide, as growing concerns about environmental issues and increasing petroleum costs. The demands for the LIBs include high energy and power densities, and better cyclic stability in order to meet a wide range of …
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Design of novel lithium storage materials with a polyanionic framework
… due to its negligible Li intercalation capacity. In contrast, the monoclinic LiMnBO₃ compound exhibited much more electrochemical activity than the hexagonal polymorph. In this thesis work, the discharge capacity of 100 mAh g 1 with acceptable capacity retention was achieved by simple …
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Optical diagnostics of lithium-sulfur and lithium-ion battery electrolytes using attenuated total reflection infrared spectroscopy
… was observed over 7 discharge/charge cycles. Capacity fading is evident in the decay of polysulfide order and concentration at the same state of charge between cycles. Sulfur is not recovered by charging the cell in latter cycles, and the active material is lost as solid Li2S. The improvement …
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Investigating Chemical and Structural Heterogeneities of High-Voltage Spinel Cathode Material for Li-ion Batteries
… due to their low cost, low toxicity, and high capacity and energy density making them promising to meet increasing consumer demands for battery materials. However, transition metal dissolution, interfacial instability, and capacity fading plague these materials when paired with graphite, …
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Reduced graphene oxide nanoparticle hybrids and their assembly for lithium-ion battery anodes
… There is a growing need for LIBs with higher capacity, rate performance and cycling stability. At the anode electrode these challenges are being addressed for instance by utilising materials with higher theoretical capacity compared to graphite (372 mAh/g) or by optimising the morphology of …
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Understanding the Solid Electrolyte Interphase Formed on Si Anodes in Lithium Ion Batteries
… interphase (SEI) on next-generation, high-capacity Si anodes in conventional carbonate electrolytes with and without fluoroethylene carbonate (FEC) additives. A model system of silicon nanowire (SiNW) electrode is used to avoid interference from the polymeric binder. To facilitate …
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Simulations of silicon-graphene anodes using machine-learning-based interatomic potentials
… issues, such as mechanical degradation and capacity fading. Carbon composite, such as graphene or amorphous carbon, incorporation into silicon anodes has emerged as a potential solution to these challenges, but a complete simulation of the silicon-carbon systems with a full …
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Revealing Interfacial Reactions and Charge Transfer Kinetics in Electrochemical Energy Storage and Conversion
… for interface impedance build-up and battery capacity fading. Based on the proposed mechanism, strategies to suppress battery degradation were further demonstrated and discussed. Next, the kinetic mechanism for Li-ion intercalation was investigated, and experimental evidence from a …
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Hobby Grade Lithium-Ion Batteries for Spacecraft Applications: Establishing an Automated Electrical Characteristics Testing Procedure For Flight Acceptance of non-Space-Grade Small Secondary Batteries
… for level of self-discharge, thermal stability, capacity retention, vibration resistance, charge-discharge cycling behavior, and tolerance low atmosphere. The electrochemical properties of the batteries must meet various criteria to show that they will be stable and safe to use in a CubeSat.</p> …
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Investigating the Thermal Stability and Cation Ordering in Layered Cathode LixMO2 (x ≤ 1; M = Co, Mn, Ni) Materials for Li-ion Rechargeable Batteries and Studying the Ferroelectric Properties of LiNbO3 Nanoparticles
… to understand the correlation between capacity fading and thermal stability relating to the microstructures. Our results showed that delithiated (charged) LiCoO2, forms a metastable LiCo2O4 spinel phase during the ageing process, and eventually decomposes to Co3O4 over time. These two …
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MULTILAYER COMPOSITE SOLID ELECTROLYTES FOR LITHIUM ION BATTERIES
… metal/polymer electrolytes causes further capacity fading. With the aim of fabricating SEs which possess optimal properties, a novel SE was developed by forming a multilayer structure. The multilayer SE was fabricated using polymeric and ceramic electrolytes, which can integrate the merits …
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Towards Thick Battery Electrodes and Interdigitated Cell Architectures Via Micro-structured Carbon Nanotube Forests
… with thick planar electrodes suffer from capacity limitations due to increased mechanical fatigue, Li-ion diffusion distances, and tortuosity. 3D electrode designs compensate for this weakness by providing micro-scale channels within the electrode to enable rapid charge transport and …
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Investigation into key interfacial reactions within lithium-ion batteries
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-07-07 without embargo terms
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NMR Studies of the Electronic Structure, Lithium-Ion Dynamics, and Prelithiation of Lithium-Ion Battery Anode Materials
… the need for electrodes with increased specific capacity (mAh/g and mAh/cm3) which can run for 100s to 1000s cycles. The manufacturing of these electrodes must also be cheap and scalable in order to meet the demands of future electric vehicles. A Li-ion battery has two types of electrodes, …
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Understanding the Chemistries of Ni-rich Layered Oxide Materials for Applications in Lithium Batteries and Catalysis
… cost-efficient and possess increased practical capacity. The challenge to studying this class of materials is their inherent electronic and structural fragility. The fragility of these materials is facilitated by a cooperation of metal cation migration, lattice oxygen loss, and undesirable oxide …