Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 38
Book Description
Long Life Nickel Electrodes for Nickel-Hydrogen Cells: Fiber Substrates Nickel Electrodes
Author: Long Life Nickel Electrodes for Nickel-Hydrogen Cells: Fiber Substrates Nickel Electrodes
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781723736056
Category : Science
Languages : en
Pages : 38
Book Description
Samples of nickel fiber mat electrodes were investigated over a wide range of fiber diameters, electrode thickness, porosity and active material loading levels. Thickness' were 0.040, 0.060 and 0.080 inches for the plaque: fiber diameters were primarily 2, 4, and 8 micron and porosity was 85, 90, and 95%. Capacities of 3.5 in. diameter electrodes were determined in the flooded condition with both 26 and 31% potassium hydroxide solution. These capacity tests indicated that the highest capacities per unit weight were obtained at the 90% porosity level with a 4 micron diameter fiber plaque. It appeared that the thinner electrodes had somewhat better performance, consistent with sintered electrode history. Limited testing with two-positive-electrode boiler plate cells was also carried out. Considerable difficulty with constructing the cells was encountered with short circuits the major problem. Nevertheless, four cells were tested. The cell with 95% porosity electrodes failed during conditioning cycling due to high voltage during charge. Discharge showed that this cell had lost nearly all of its capacity. The other three cells after 20 conditioning cycles showed capacities consistent with the flooded capacities of the electrodes. Positive electrodes made from fiber substrates may well show a weight advantage of standard sintered electrodes, but need considerably more work to prove this statement. A major problem to be investigated is the lower strength of the substrate compared to standard sintered electrodes. Problems with welding of leads were significant and implications that the electrodes would expand more than sintered electrodes need to be investigated. Loading levels were lower than had been expected based on sintered electrode experiences and the lower loading led to lower capacity values. However, lower loading causes less expansion and contraction during cycling so that stress on the substrate is reduced.Rogers, Howard H.Glenn Research CenterFIBERS; SUBSTRATE
Long Life Nickel Electrodes for a Nickel-hydrogen Cell
Author: H. S. LimProgress in the Development of Lightweight Nickel Electrode for Nickel-Hydrogen Cell
Author: Doris L. BrittonNickel-hydrogen Life Cycle Testing
Author: Lawrence H. ThallerPublisher: AIAA
ISBN: 9781884989131
Category : Technology & Engineering
Languages : en
Pages : 212
Book Description
The review and analysis reported here are the outcomes of a project carried out from 1998-2001 within the Energy Technology Department of the The Aerospace Corporation to examine the available results of different nickel-hydrogen life testing programs that had been or were being carried out for low Earth orbit (LEO) applications. The cycling programs, some of which are still in progress, were conducted under different sponsorships and carried out at different testing facilities.
Electrochemical Impregnation and Cycle Life of Lightweight Nickel Electrodes for Nickel-hydrogen Cells
Author: Doris L. BrittonPublisher:
ISBN:
Category : Electrodes, Nickel
Languages : en
Pages : 4
Book Description
Modeling Performance Degradation in Nickel Hydrogen Cells
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
With the increasing use of nickel hydrogen cells and batteries, degradation models and cycle life predictions can be valuable if they are valid. This report reviews previous studies of the expansion characteristics of nickel electrodes, as well as early efforts to predict cycle life as a function of depth of discharge. The results of these earlier studies are then used to suggest a more accurate degradation model for nickel electrodes. Preliminary experimental studies have focused on electrodes of the type used in typical flight hardware. The objective is to explore the stiffness of electrodes as they are cycled to different depths of discharge and different concentrations of KOH. Electrodes of different plaque strengths, loading levels of active material, and amounts of cobalt additives will eventually be investigated. The ultimate goal is to more accurately predict the cycle life of a cell as affected by design parameters. Nickel hydrogen, Life prediction models, Performance degradation, Nickel electrode expansion.
Battery Reference Book
Author: Thomas P J CromptonPublisher: Elsevier
ISBN: 0080499953
Category : Technology & Engineering
Languages : en
Pages : 760
Book Description
Crompton's Battery Reference Book has become the standard reference source for a wide range of professionals and students involved in designing, manufacturing, and specifying products and systems that use batteries. This book is unique in providing extensive data on specific battery types, manufacturers and suppliers, as well as covering the theory - an aspect of the book which makes an updated edition important for every professional's library. The coverage of different types of battery is fully comprehensive, ranging from minute button cells to large installations weighing several hundred tonnes. Must-have information and data on all classes of battery in an accessible form Essential reference for design engineers in automotive and aerospace applications, telecommunications equipment, household appliances, etc. Informs you of developments over the past five years
Author: 
Author: