The performance of the Li/SO2Cl2 primary cell was studied as a function of the type of the carbon cathode, cathode catalysts and electrolyte additives. Solutions of LiAlCl4 in SO2 are more conductive than those in SO2Cl2 and, consequently, the electrolyte resistance in the Li/SO2Cl2 cell decreases during discharge as one mole of SO2 is formed per mole of SO2Cl2. The replacement of the low during discharge as one mole of SO2 is formed per mole of SO2Cl2. The replacement of the low surface area Chevron acetylene black carbon with the high surface area Ketjenblack carbon cathode increases cell capacity and reduces cathode polarization. The high surface area carbon, however, causes a deterioration in the storability of the cell, manifested as higher self-discharge rate. The use of carefully purified SO2Cl2, and of Ca2+ as an additive to the electrolyte, has been found to reduce the voltage delay of the cells stored at 70-degrees-C. The low temperature discharge capacity of the Li/SO2Cl2 cell can be increased with the addition of SO2. Furthermore, the added SO2 appeared to improve the storability of the cells. Cathodes doped with a catalysts consisting of a mixture of polyacrylonitrile and Co, Ni or Fe-salts, after heat treatment at 800-degrees-C, demonstrated 350-500 mV gain in the load voltage at 25mA cm-2. Catalysed cells stored at 70-degrees-C retained their higher cell voltage but, like the uncatalysed cells, showed a loss in capacity.