Electrochemical behavior of heavily cycled nickel electrodes in Ni/H sub 2 cells containing electrolytes of various KOH concentrations

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6980063

Lim, H S; Verzwyvelt, S A ^[1]

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1. Hughes Aircraft Co., Los Angeles, CA (USA)

A study has been made of charge and discharge voltage changes with cycling of Ni/H2 cells containing electrolytes of various KOH concentrations. A study has also been made of electrochemical behavior of the nickel electrodes from the cycled Ni/H2 cells as a function of overcharge amounts. Discharge voltages depressed gradually with cycling for cells having high KOH concentrations (31 to 36 percent), but the voltages increased for those having low KOH concentrations (21 to 26 percent). To determine if there was a crystallographic change of the active material due to cycling, electrochemical behavior of nickel electrodes was studied in an electrolyte flooded cell containing either 31 or 26 percent KOH electrolyte as a function of the amount of overcharge. The changes in discharge voltage appear to indicate crystal structure changes of active material from gamma-phase to beta-phase in low KOH concentrations, and vice versa in high KOH concentration. 10 refs.

• OSTI ID: 6980063
• Report Number(s): CONF-8910107--
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250902* -- Energy Storage-- Batteries-- Performance & Testing
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BCC LATTICES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISPERSIONS
ELECTRIC BATTERIES
ELECTRIC DISCHARGES
ELECTROCHEMICAL CELLS
ELECTRODES
FCC LATTICES
HYDROGEN COMPOUNDS
HYDROXIDES
METAL-GAS BATTERIES
MIXTURES
NICKEL-HYDROGEN BATTERIES
OXYGEN COMPOUNDS
PERFORMANCE
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
QUANTITY RATIO
SOLUTIONS