This paper describes a study of room temperature lithium cells employing solutions of LiBCl4 in POCl3 and LiAlCl4 in SOCl2  as electrolytes and polytetrafluoroethylene (Teflon)‐bonded carbon black electrodes as cathodes. A novel feature of these cells is that during discharge the solvents, i.e., POCl3 and SOCl2 , are electrochemically reduced and behave as soluble cathodes. Sealed prototype cells were fabricated using a polyethylene‐polyester laminated bag container. Based on total cell weight, a prototype cell yielded an experimental energy density of 244 W‐hr/lb for a 57‐hr discharge rate (20 mA constant current; 1 mA/cm2 current density). The performance of these cells is also compared with the performance of prototype lithium‐organic electrolyte‐graphite monofluoride and lithium‐inorganic electrolyte‐tetracarbon monofluoride cells.

Luminescent silicon nanocrystals (Si-nc) are promising material for biomedical purposes. However, as-prepared Si-nc are Hterminated and not miscible with biological (aqueous) liquids. We used physical and chemical adsorption of undecylenic acid to make porous silicon (porSi, material containing Si-nc assemblies) miscible with water solutions. PorSi powders prepared by two different methods, electrochemical anodization and stain etching were modified and suspended in water. Luminescent properties of aqueous suspensions have been then monitored for long time. The many-fold buildup of initial luminescence intensity during the first 3-6 days has been observed for electrochemically prepared porSi material. This phenomenon was explained as disaggregating of the primary micelles formed from surfactant-covered porSi particles into smaller ones. Contrary to this, the stain etched porSi powder exhibited a continuous decrease of the luminescence intensity with time and, moreover, was much less luminescent. Thus, electrochemically prepared porSi is found more appropriate for photosensitizing biomedical applications.

Untersucht werden bei Raumtemperatur arbeitende Zellen mit Li‐Anode, in denen′ Lösungen von LiBCl4 in POCl3 oder von LiAlCl4 in SOCI, als Elektrolyte und mit Teflon gebundene Rußelektroden als Kathoden verwendet werden.

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