Accession Number : AD0487623

Title :   INVESTIGATION OF POROUS LITHIUM BATTERY ELECTRODES.

Descriptive Note : Quarterly technical progress rept. no. 4, 15 Apr-15 Jul 66,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : McCallum, J. ; Semones, D. E. ; Roeger, E. A., Jr. ; Faust, C. L.

Report Date : 31 JUL 1966

Pagination or Media Count : 47

Abstract : The objective of this program is to investigate methods for producing highly porous lithium electrodes for use in rechargeable spacecraft batteries. This report describes theoretical considerations for, and experimental measurements of, electrochemical parameters for the purpose of correlating electrode performance with true electrochemical areas of electrodes. Among such parameters are: (1) direct charging capacitance, (2), potentiostatic pulse oxidation, and (3) exchange current measurements. Smooth planar surfaces and porous electroformed screen surfaces are to be considered. First results with area measurements have shown that double layer capacitance data in propylene carbonate electrolyte should be useful for estimating true surface areas of inert porous electrode supports. Research is being continued to establish, if possible, a method for measurement of the true surface area of lithium in an inert support. Other work used smooth foils as electrode supports in cell-like construction. Results showed efficiency of utilization of electrodeposited lithium up to 31 percent. Such efficiency was measured during cycling at about 5 ma/sq cm and at a nominal 125-minute rate. At this rate, the calculated thickness of lithium coatings on the 0.5-mil foil support would be about 2 mils.

Descriptors :   *LITHIUM), (*ELECTRODES, BATTERY COMPONENTS, ELECTRIC BATTERIES, POROUS METALS, ELECTROCHEMISTRY, ELECTRICAL PROPERTIES, VOLTAGE, POLARIZATION, PERFORMANCE(ENGINEERING).

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE