Accession Number : ADD014470

Title :   Electrochemical Preparation of Silver Oxide Electrodes Having High Thermal Stability.

Descriptive Note : Patent, Filed 2 Aug 89, patented 9 Jan 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Glen, Daniel R ; Mansour, Azzam N ; O'Neill, Kathleen M ; Dallek, Steven ; Larrick, Benjamin F

Report Date : 09 Jan 1990

Pagination or Media Count : 6

Abstract : The shelf life of electrochemically prepared AgO cathodes is improved by increasing the temperature of anodization step to about 70 Deg C, or higher. At these elevated temperatures the capacity of the AgO electrode can also be increased by using a charge-discharge-charge regime. This invention relates to electrochemical cells and more particularly to silver oxide electrodes. Conventional methods of making silver oxide cathode material may be divided into two types: electro-chemical and chemical. In a typical electrochemical process, a sintered silver plate is anodized in a 31 weight percent KOH solution at room temperature. This method produces a cathode material that is capable of high rates of discharge but which has a very limited shelf life due to thermal instability. Chemically prepared silver oxide is made by the chemical oxidation of silver nitrate with potassium persulfate or ozone in KOH solution at 90 C. The chemically prepared material is more stable than the electrochemically prepared material but has not been use for high-power batteries because of its low electrical conductivity. It would be desirable to produce silver oxide (AgO) electrodes having both high electrical conductivity and high thermal stability and long shelf life. Keywords: Patents, PAT-CL-204-56.1. (KR)

Descriptors :   *ELECTRODES, *PATENTS, *THERMAL STABILITY, ANODIC COATINGS, CATHODES, CELLS, CHEMICALS, ELECTRICAL CONDUCTIVITY, ELECTROCHEMISTRY, HIGH RATE, HIGH TEMPERATURE, LONG LIFE, MATERIALS, NITRATES, OXIDATION, OXIDE CATHODES, OZONE, PREPARATION, ROOM TEMPERATURE, SHELF LIFE, SILVER ALLOYS, SILVER COMPOUNDS, SILVER OXIDES, SOLUTION HEAT TREATMENT, TEMPERATURE, THERMAL INSTABILITY

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE