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 30 for “"Capacity loss"”.
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Capacity loss due to sub-optimal water-pouring
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Understanding initial capacity loss in substituted layered oxide cathodes for lithium-ion batteries
… after delithiation, resulting in a substantial capacity loss of 10–15%. This loss is conventionally attributed to bulk lithium transport limitations arising from three interrelated factors: (1) contraction of the c-axis lattice during lithiation, (2) reduced rate of tetrahedral site hopping …
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SMART INTERSECTIONS: COOPERATIVE TRAFFIC CONTROL FOR LONGER BATTERY LIFE OF COMMUNICANT AUTONOMOUS VEHICLES
… develops an analytical model for the battery-capacity loss rate of CAV platoons coordinated to pass through signal-free smart intersections with no interruption. The main objective of the research is to demonstrate the importance of adjusting the macro-level setting of the cooperative control …
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Information theory of transmit diversity and space-time code design
… case of a single receiver antenna there is no loss in capacity if one reserves to this technique as a mean of exploiting transmit diversity. However, we note that in the case of multiple receivers there is a penalty in capacity. Also, we demonstrate that CDMA orthogonalisation between antennas …
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The application of genetic algorithms to parameter estimation in lead-acid battery equivalent circuit models
… including the internal resistances, SOC, and capacity. Simulation results show that the model is able to adequately simulate the battery discharge process. The aforementioned models were extended to a further investigation of the batteries state of health. There is a link between the status of …
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Performance evaluation of transmit diversity techniques in the CDMA 2000 standard
… power is used to compute an estimate of cell capacity as measured by the number of supported users, assuming a fixed total transmit power at the base station. It is observed that enabling STS increases capacity by up to 80% if all mobiles support STS, but capacity is reduced by up to 20% when …
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Direct measurement of vanadium cross-over in an operating redox flow battery
… separate from the cell stack. The storage capacity of such systems is limited by the size of the external tanks, making the RFB an ideal technology for grid level energy storage. The vanadium redox flow battery (VRB) is a particularly attractive variant of the RFB, due to its use of a …
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Finding the optimal demodulator under implementation constraints
… objective function, e.g., the channel capacity and the cut-off rate. We propose easy-to-implement solutions for Gaussian channels that approximate the optimal results for these maximization problems. Three topics are addressed. First, we consider the case where the channel output is …
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Modelling and design of compact wideband and ultra-wideband antennas for wireless communications. Simulation and measurement of planer inverted F antennas (PIFAs) for contemporary mobile terminal applications, and investigations of frequency range and radiation performance of UWB antennas with design optimisation using parametric studies.
… pattern. The performances such as return loss, radiation pattern and current distribution of the UWB antennas are extensively investigated and carried out. All the results have been demonstrated using simulation and experimentally whereby all results satisfy the performance under - 10dB …
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Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes
… active reflection coefficient (TARC), channel capacity and capacity loss of the array antenna were computed and the results compared to measurements with good agreement. In addition, a computational method combining Genetic Algorithm (GA) with surface meshing code for the analysis of a 2×2 …
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Understanding Transition Metal Dissolution from Battery Materials with Solution NMR Methods
… of the anode solid electrolyte interphase, and loss of lithium from the active lithium inventory, ultimately causing battery capacity loss. It is generally accepted that dissolved transition metals (e.g., Mn²⁺, Ni²⁺, Co²⁺) are paramagnetic. In NMR measurements, paramagnetic solutes can …
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Design Guidelines for Sulfonyl/Sulfamoyl Fluoride Additives to Modulate Lithium Anode Coulombic Efficiency
The lithium metal anode has a high theoretical capacity (3860 mAh / g) and low electrochemical potential (‐3.04 V vs SHE), making it an ideal anode material for high energy density Li batteries. However, the high reactivity of Li metal with electrolytes results in the formation of a solid …
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Stability of lithium aluminum manganese oxide cathodes for rechargeable lithium batteries
… (3) Al-doped spinels exhibit much improved capacity stability at elevated temperatures compared to undoped spinels. This effect has been discussed with respect to proposed mechanisms of Mn dissolution and capacity loss. (4) Magnetic properties are critically influenced by phase stability, …
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Preparation and Electrochemical Testing of Flexible Carbon Nanofiber Electrodes from Electrospinning
… the flexible electrode exhibited a specific capacity of 379 mAH g-1 at the 100th cycle and capacity retention was 97.4% relative to the fifth cycle. When applied as an active material support electrode for lithium ion battery cathodes, the carbon support was successfully utilized with both …
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Electrochemomechanical fatigue and fracture in electrode and electrolyte materials for Li-Ion batteries
… the performance of LIBs over time in terms of capacity loss, growth of electrochemical impedance, and in all-solid-state batteries (ASSBs) even failure via short-circuiting. To better understand and predict mechanisms for electrochemically-induced fracture, we measured elastic, plastic, and …
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Novel Syntheses and Surface Modifications of Electrode Materials for Superior Lithium-Ion Batteries
… developing novel electrode materials with high capacity, excellent cycling stability and remarkable rate capability for next-generation lithium-ion batteries. The effects of surface modifications for LiMn2O4 cathode materials are studied by depositing ultrathin conformal amphoteric oxides via …
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Time varying channel models for 5G mobile communication systems
… purpose of state estimation. By doing this the capacity loss is staggering for n-times higher carrier frequency channels and n-dimensional multiple input and multiple output channels, eliminating almost entirely the capacity gain of these two most promising capacity-increasing techniques for 5G. …
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Bringing Redox Flow Batteries to the Grid: Techno-economic Modeling for Chemistry-Informed Design of Redox Flow Batteries
… for efficient, continuous recovery of crossover losses (often the fastest form of capacity decay in RFBs). Despite these techno-economic benefits and decades of research, RFBs have seen minimal adoption; even within the subset of battery deployment specifically, RFBs are dwarfed by lithium-ion …
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Multi-scale electrochemical-thermal modelling of a sodium-ion battery cell using the SPMe with a lumped thermal model
… -20 °C to 55 °C, to analyze voltage profiles, capacity retention, thermal response, and volumetric energy-power trade-offs. The model predicted a maximum discharge capacity of ~2.75 mAh at the lowest rate of C/15 across most operating temperatures. Capacity loss increased with increasing …
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Investigation of Integrated Decoupling Methods for MIMO Antenna Systems. Design, Modelling and Implementation of MIMO Antenna Systems for Different Spectrum Applications with High Port-to-Port Isolation Using Different Decoupling Techniques
… active reflection coefficient (TARC), channel capacity loss (CCL), diversity gain (DG), antenna efficiency, antenna peak gain and antenna radiation patterns. Three new 2×2 MIMO array antennas are proposed, covering dual and multiple spectrum bandwidths for WLAN (2.4/5.2/5.8 GHz) and WiMAX (3.5 …
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