Non-aqueous cells employing an anode, such as lithium, a liquid organic electrolyte and a cathode comprising manganese dioxide (MnO.sub.2), carbon monofluoride (CF.sub.x) or mixtures of the two and an additive selected from the group consisting of vanadium oxide (V.sub.6 O.sub.13+y), silver vanadate...http://www.google.ca/patents/US5180642?utm_source=gb-gplus-sharePatent US5180642 - Electrochemical cells with end-of-service indicator
