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 41 for “"Discharge capacity"”.
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Development of methods to predict the discharge capacity in model and prototype meandering compound channels
… author developed two methods for predicting the discharge capacity of uniform meandering compound channels. The first method utilised an Artificial Neural Network (ANN) functional approximator which was taught to replicate the relationship between 9 of the key parameters and the magnitude of F* …
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The Incorporation of Graphene to Lithium Cobalt Oxide as a Cathode to Improve the Performance of Lithium Ion Batteries
… a 0.5 wt.% graphene powder exhibited the highest discharge capacity at currents 0.1 C and 0.5 C, The incorporation of 1 wt.% graphene powder contributed the most stable performance of the cathode at currents from 0.1 C to 2 C. In addition, the cell with its cathode incorporated with 2 wt.% …
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Synthesis and properties of some doped lithium transition-metal phosphates
… Li secondary batteries. LiCoPO₄ showed a first discharge capacity of 130 mAh/g at 4.6V, but could be cycled over only a limited number of charge-discharge cycles owing to electrolyte instability at the high oxidation potentials (>5V) required for full charge. LiNiPO₄ could not be charged at all …
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Developing new techniques to synthesize layered cathode materials for lithium-ion batteries
… up the reaction. One of the main reasons for capacity fade in batteries is cationic mixing between Ni²⁺ and Li⁺. This results in blocking of the Li⁺ path and ultimately poor cyclability. This capacity fade has been successfully minimized in our current work by taking advantage of the high heat …
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Drumlins in North Dakota
… and gravel deposits (great permeability--rapid discharge capacity) surrounded by sediment with a large amount of silt and clay (slight permeability--slow discharge capacity) shear strength would be an important factor in erosion occurring during a second advance. A sand and gravel body with a …
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MATHEMATICAL MODELING OF LIAL/FES¬2 HIGH TEMPERATURE BATTERY SYSTEM
… salt on active area in the electrode and the discharge capacity. In addition, the model also takes the change in volume of the active material into account during the electrochemical reactions by incorporating the change in porosity of the electrode and the change in dimension of the …
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Synthesis and Characterization of Polymer Composite Materials For Lithium Battery Cathodes and Capacitors
… resistance, lower initial voltage drop, higher discharge capacity and higher rate-capability than state-of-the-art SVO. PPy/SVO composite cathode materials were synthesized by polymerizing pyrrole onto the surface of pure SVO particles. Electrochemical characterization was carried out by …
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Multifunctioning Electrocatalytic Cathodes for Lithium-Air and Lithium-Oxygen Batteries
… cathode, enhancing the cycle life and the discharge capacity of the LABs and LOBs via promoting oxygen reaction kinetics. My PhD study is focused on developing transition metal derivative-based novel bifunctional catalysts to achieve superior charge densities and cyclability in LABs with …
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Synthesis and characterization of ionic liquid electrolytes for use in electrical energy storage devices at elevated temperatures
… cycling for over 10,000 cycles at 100 oC with a discharge capacity of 28 F/g, while a traditional system failed after 3200 cycles. The second is a lithium free dicyanamide anion based RTIL electrolyte equipped supercapacitor. This system relies on the cations and anions of the RTIL to act as the …
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A study of flow structures in a two-stage channel using field data, a physical model and numerical modelling
… in the river and model have been identified. The discharge capacity of the main river channel is significantly reduced during summer months, due to seasonal growth in vegetation, reaching a minimum in August. The gradient of the stagedischarge rating curve for summer months can be seven times …
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Optimization of Spray Pyrolysis for the Synthesis of Cathode Materials for Lithium- and Sodium-ion Batteries
… under development. Its ability to reach discharge capacity above 200 mAh g-1 and low cobalt content make it a promising candidate for cathode material of electric vehicles. 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 (Li1.2Mn0.54Ni0.13Co0.13O2) is currently the most widely studied chemistry. Yet, …
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Designing new electrode materials for energy devices by integrating ab initio computations with experiments
… as a way to gauge useful properties such as high capacity in electrode materials. The feasibility of a Ni2+/Ni4+ active redox couple is confirmed in a new layered electrode material, Lio.gNi045Ti5502. First principles calculations combined with experiments show that the degree of cation …
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Understanding and Controlling Failure Mechanisms of the Zinc Anode for Rechargeable Alkaline Batteries
… the percent utilization of the theoretical capacity of the Zn electroactive material is systematically varied between 1% and 16%. Cell fabrication is kept typical to the prevailing industrial cell design. Cycle life ranges from 2800 to 60, depending inversely on the Zn utilization. In all …
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Synthesis and characterization of novel fluoride and oxide cathodes for rechargeable batteries
… paths. As with other fluorides, specific capacity was strongly linked with processing conditions. The layered lithium-excess . . . compounds were designed from recent understanding of diffusion channels in lithium-excess materials. Increasing lithium content was found to improve both …
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Beyond Lithium-Ion Technology: Lithium-Sulfur and Potassium-Ion for Better and Cheaper Batteries
… results in the interlayer increase initial discharge capacity and prolong the cycle life as compared to the cell without this interlayer. In the next part of this PhD project, a new ion storing mechanism is designed to compete for the diffusion limitation and the structural deterioration of …
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The assessment of battery-ultracapacitor hybrid energy storage systems
… between them. To quantify this assessment, Discharge Capacity(0) is defined as the amount of energy one can draw out of an ESS per unit charge supplied by this ESS. The metric for quantifying the benefits is energy efficiency gain, defined as the percentage increase in the discharge …
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Development of semi-solid alkaline flow battery
… above percolation threshold to obtain maximum discharge capacity of Ni(OH)2. Thirdly, based on the understanding from conductivity and stability of the suspension, we designed catholyte (~ 5 M Ni(OH)2) and tested its electrochemical performance in a static cell. We were able to achieve energy …
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An investigation of the performance of a stationary siphoning type of roof ventilator
… of Ventilators tested, the relationship between discharge capacity and wind Velocity across any given ventilator was found to be approximately linear. It was observed that small disturbances in the air currents around the Ventilator head seriously affect the discharge and that for maximum …
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Multi-component ab2 metal hydride alloys for nickel metal hydride battery applications
… the maximum gaseous phase hydrogen storage capacity increased but maximized at Zr : Ni = 9 : 11. Comparing the properties before and after annealing, it was clear that the natures of constituent phases influenced the gaseous phase storage. The highest full discharge capacity was obtained at …
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Studies of Sulfur-based Cathode Materials for Rechargeable Lithium Batteries
Developing alternative cathodes with high capacity is critical for the next generation rechargeable batteries to meet the ever-increasing desires of global energy storage market. This thesis is focused on two sulfur-based cathode materials ranging from inorganic lithium sulfide to organotrisulfide. …
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