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  • 1
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    A mathematical model for predicting cyclic voltammograms of electronically conductive polypyrrole (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Polypyrrole is an attractive polymer for use as a high-energy-density secondary battery because of its potential as an inexpensive, lightweight, and noncorrosive electrode material. A mathematical model to simulate cyclic voltammograms for polypyrrole is presented. The model is for a conductive porous electrode film on a rotating disk electrode (RDE) and is used to predict the spatial and time dependence of concentration, overpotential, and stored charge profiles within a polypyrrole film. The model includes both faradic and capacitance charge components in the total current density expression.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: New Secondary Batteries Utilizing Electronically Conductive Polymer Cathodes; 28 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Calorimetric determination of the thermoneutral potential for Li/BrCl in SOCl2 (BCX) cells (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Proliferation of lithium cells into large modular battery packs are projected for future space applications. Assuring battery design safety while maintaining high energy density requires accurate and precise knowledge of the thermal parameters of the battery cell. Specifically, the thermoneutral potential was determined using heat conduction calorimetry on Li/BrCl in SOCl2 (BCX) DD-cells and compared to measurements obtained on Li/SOCl2 D-cells. Over 20 to 60 C, the Li/BCX cells were found to have a thermoneutral potential significantly higher (near 4.0 volts) than that for the Li/SOCl2 cells tested. The higher heat generation measured during discharge reflects the higher electrochemical polarization observed with the BCX cells.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Marshall Space Flight Center, The 1990 NASA Aerospace Battery Workshop; p 369-394
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Mathematical Modeling of Ni/H2 and Li-Ion Batteries (2001)
    In:  CASI
    Details
    Publication Date: 2017-09-27
    Description: The modelling effort outlined in this viewgraph presentation encompasses the following topics: 1) Electrochemical Deposition of Nickel Hydroxide; 2) Deposition rates of thin films; 3) Impregnation of porous electrodes; 4) Experimental Characterization of Nickel Hydroxide; 5) Diffusion coefficients of protons; 6) Self-discharge rates (i.e., oxygen-evolution kinetics); 7) Hysteresis between charge and discharge; 8) Capacity loss on cycling; 9) Experimental Verification of the Ni/H2 Battery Model; 10) Mathematical Modeling Li-Ion Batteries; 11) Experimental Verification of the Li-Ion Battery Model; 11) Integrated Power System Models for Satellites; and 12) Experimental Verification of Integrated-Systems Model.
    Keywords: Electronics and Electrical Engineering
    Type: The 2000 NASA Aerospace Battery Workshop; NASA/CP-2001-210883
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  • 4
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    A mathematical model of the maximum power density attainable in an alkaline hydrogen/oxygen fuel cell (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A mathematical model of a hydrogen/oxygen alkaline fuel cell is presented that can be used to predict the polarization behavior under various power loads. The major limitations to achieving high power densities are indicated and methods to increase the maximum attainable power density are suggested. The alkaline fuel cell model describes the phenomena occurring in the solid, liquid, and gaseous phases of the anode, separator, and cathode regions based on porous electrode theory applied to three phases. Fundamental equations of chemical engineering that describe conservation of mass and charge, species transport, and kinetic phenomena are used to develop the model by treating all phases as a homogeneous continuum.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-188613 , NAS 1.26:188613
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  • 5
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    Mathematical modeling of a thermovoltaic cell (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new type of battery named 'Vaporvolt' cell is in the early stage of its development. A mathematical model of a CuO/Cu 'Vaporvolt' cell is presented that can be used to predict the potential and the transport behavior of the cell during discharge. A sensitivity analysis of the various transport and electrokinetic parameters indicates which parameters have the most influence on the predicted energy and power density of the 'Vaporvolt' cell. This information can be used to decide which parameters should be optimized or determined more accurately through further modeling or experimental studies. The optimal thicknesses of electrodes and separator, the concentration of the electrolyte, and the current density are determined by maximizing the power density. These parameter sensitivities and optimal design parameter values will help in the development of a better CuO/Cu 'Vaporvolt' cell.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-189896 , NAS 1.26:189896
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  • 6
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    New Secondary Batteries Using Electronically Conductive Polymer Cathodes (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A Li/Polypyrrole secondary battery was designed and built, and the effect of controlling the morphology of the polymer on enhancement of counterion diffusion in the polymer phase was explored. The experimental work was done at Colorado State University, while the mathematical modeling of the battery was done at Texas A and M University. Manuscripts and publications resulting from the project are listed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-188604 , NAS 1.26:188604
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    NASA TECHNICAL REPORTS
  • 7
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    Mathematical modeling of a nickel/hydrogen cell (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: A mathematical model based on fundamental principles to simulate the dynamic behavior of a nickel/hydrogen cell, is developed.
    Keywords: Energy Production and Conversion
    Type: The 1995 NASA Aerospace Battery Workshop; 447-488; NASA-CP-3325
    Format: text
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  • 8
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    New secondary batteries utilizing electronically conductive polymer cathodes (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objectives of this project are to optimize the transport rates in electronically conductive polypyrrole films by controlling the morphology of the film and to assess the utility of these films as cathodes in a lithium/polypyrrole secondary battery. During this research period, progress has been made in improving the charge transport rate of the supermolecular-engineered polypyrrole electrode by eliminating the polypyrrole baselayer that hampered earlier work. Also, the fibril density of the polypyrrole electrode was increased, providing more electroactive sites per unit area.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-183248 , NAS 1.26:183248
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  • 9
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    Optimization of the lithium/thionyl chloride battery (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A 1-D math model for the lithium/thionyl chloride primary cell is used in conjunction with a parameter estimation technique in order to estimate the electro-kinetic parameters of this electrochemical system. The electro-kinetic parameters include the anodic transfer coefficient and exchange current density of the lithium oxidation, alpha sub a,1 and i sub o,i,ref, the cathodic transfer coefficient and the effective exchange current density of the thionyl chloride reduction, alpha sub c,2 and a sup o i sub o,2,ref, and a morphology parameter, Xi. The parameter estimation is performed on simulated data first in order to gain confidence in the method. Data, reported in the literature, for a high rate discharge of an experimental lithium/thionyl chloride cell is used for an analysis.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-184761 , NAS 1.26:184761
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  • 10
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    New secondary batteries utilizing electronically conductive polymer cathodes (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objectives are to optimize the transport rates in electronically conductive polypyrrole films by controlling the morphology of the film and to assess the utility of these films as cathodes in a lithium/polypyrrole secondary battery. During this research period, a better understanding was gained of the fundamental electrochemical switching processes within the polypyrrole film. Three publications were submitted based on the work completed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-181216 , NAS 1.26:181216
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