Failure Analysis of Porous Electrodes.
Abstract
A single pore Ag/AgCl electrode was constructed for the study of elementary processes that occur in porous electrodes. X-ray element scan was applied to determine the average local transfer current densities inside the pore. The morphology of AgCl on the surface of silver was studied using a scanning electron microscope. It was found that the size of AgCl particles depended on the average local current densities and the local electrolyte concentrations. Higher current densities gave smaller AgCl mounds, in general. The formation of AgCl was also observed to form mainly from electrolyte diffusion paths as opposed to solid phase diffusion. A porous structure of silver was observed after cycling. The use of intercalation compounds of graphite as reactants in nonaqueous secondary batteries has been investigated. Experiments were carried out on a cell of the type Li/LiClO4, DMSU/C,LiF. Two discharge plateaus were observed, one occurring above 4.0 V and another more predominant one between 2.8 and 2.5 V. The lower discharge plateau is characteristic of the discharge plateau of a primary battery using fluorographite as the reactant. The higher discharge plateau is probably dire to the formation of the intercalation compound CnClO4 (n>1). The lower discharge plateau is comparable to the behavior of the cells described by Watanabe, et al., (1970) and Brauer (1970) using flourographite as the reactant. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1973
- Accession Number
- AD0912458
Entities
People
- Douglas N. Bennion
- Hiram Gu
- Ranna K. Hebbar
Organizations
- University of California, Los Angeles