Teflonized acetylene black

TABs are a mixture of a Teflon emulsion and acetylene black, which is prepared by a special vigorous mixing technique. 

Both the lithium sulfur dioxide (Li-SO and lithium thionyl chloride (Li-SOCy cells may be classified as liquid cathode systems. In these systems, S02 and SOCl2 function as solvents for the electrolyte, and as the active materials at the cathode to provide voltage and ampere capacity. As liquids, these solvents permeate the porous carbon cathode material. Lithium metal serves as the anode, and a polymer-bonded porous carbon is the cathode current collector in both systems. Both cells use a Teflon-bonded acetylene black cathode structure with metallic lithium as the anode. The Li-S02 is used in a spirally wound, jelly-roll construction to increase the surface area and improve... 

The preparation procedure is briefly described for carbon-based air cathode and Zn gelled anode. The carbon slurry for the gas diffusion layer was prepared with a mixture of 70 wt.% Shawinigan acetylene black (AB50) and 30 wt.% PTFE (Teflon-30 suspension) as a binder. The slurry was coated on a Ni-foam current-collector. The gas diffiision layer was sintered for... 

Construction. Figure 14.16 shows the constructional features of the cylindrical Li/SOCl2 cell, which is built as a bobbin-type construction. The anode is made of lithium foil which is swaged against the inner wall of a stainless or nickel-plated steel can the separator is made of nonwoven glass fibers. The cylindrical, highly porous cathode, which takes up most of the cell volume, is made of Teflon-bonded acetylene black. The cathode also incorporates a current collector which is a metal cylinder in the case of the larger cells and a pin in the case of smaller cells which do not have an annular cavity. 

Figure 14.61 shows the constraction of a coin-type battery. The Li/(CF) cells are typically constracted with an anode of lithium foil roUed onto a collector and a cathode of Teflon-bonded polycarbon monofluoride and acetylene black on a nickel collector. Nickel-plated steel or stainless steel is used for the case material. The coin cells are crimped-sealed using a polypropylene gasket. 

Recently, Tachibana et al. [18] used a nickel mesh electrode containing a mixture of Teflon emulsion, graphite (or acetylene black), and oxides (Mn02, liCo02, etc.). In this method the electrode is very thin, and there is no IR drop within the electrode. Therefore, measurements can be made by a simple, direct method (no potentiostat is needed). 

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