Evaluation of plasma-sprayed CoS2 cathodes for thermal batteries
Conventional electroactive stack components in thermal batteries are constructed from pressed-powder parts. These include the anode, separator, and cathode pellets (discs). Pressing parts that are less than 0.010" thick is difficult. The use of plasma spray to deposit thin CoS/sub 2/ cathode films onto a stainless steel substrate was examined as an alternative to pressed-powder cathodes. The plasma-sprayed electrodes were tested in single cells under isothermal conditions and constant-current discharge over a temperature range of 400/spl deg/C to 550/spl deg/C using standard LiSi anodes and separators based on the LiCl-KCl eutectic. Similar tests were conducted with cells built with conventional pressed-powder cathodes, which were tested under the same conditions for comparative purposes. This paper presents the results of those tests.
Advanced development issues related to plasma-sprayed pyrite electrodes for thermal batteries
The use of LiCI-KCl eutectic electrolyte as a co-spray additive for the plasma spraying of pyrite electrodes for thermal batteries has been demonstrated to provide greater mechanical strength and superior electrochemical performance relative to the use of elemental sulfur. However, higher electrolyte contents in the deposit relative to that of the feedstock are of concern, in that this results in lower energy densities and specific energies. A systematic study of the effect of the electrolyte concentration in the feedstock on the final physical and chemical properties of the final plasm-sprayed deposit was undertaken. The resulting deposits were then tested in single cells to characterize the resultant electrochemical properties. A study was also initiated to examine the effects of various lithiation agents at several concentrations on the initial voltage spike that occurs at the onset of discharge of such electrodes in Li(Si)/LiCl-KCl-(MgO)/FeS/sub 2/ single cells. The main technical issues that need to be resolved to make this a commercially viable processing technique are described.
Metallurgical Process Engineering
The "material of choice" - steel.- Uprising of China's steel industry.- Process manufacturing industry and process engineering.- Engineering science in steel manufacturing process.- Analysis and integration of metallurgical manufacturing process.- Multi-dimensional mass flow control for metallurgical manufacturing process.- Time factors in steel manufacturing process.-Operating dynamics in the production process of steel plant.- Structure and mode of steel plant.- Steel plant and environment.