Modeling Performance Degradation in Nickel Hydrogen Cells

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1991
Accession Number
ADA256465

Entities

People

  • L. H. Thaller
  • T. P. Barrera

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Additives (Chemicals)
  • Air Force
  • Bending Moments
  • Chemistry
  • Classification
  • Degradation
  • Electrochemical Cells
  • Electrodes
  • Failure Mode And Effect Analysis
  • Hydrogen
  • Materials
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Schematic Diagrams
  • Security
  • Stiffness

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Life Cycle Cost Analysis
  • Surface Engineering/Surface Coating Technology.