End of life indication system and method for non-aqueous cell having amorphous or semi-crystalline copper manganese oxide cathode material

An electronic device comprising:

• a load having a positive terminal and a negative terminal;
• an electrochemical device comprising a positive terminal, a negative terminal, and a cell comprising a cathode, the cathode comprising an amorphous or semi-crystalline copper manganese oxide cathode material, wherein the positive terminal of the electrochemical device is connected to the positive terminal of the load, the negative terminal of the electrochemical device is connected to the negative terminal of the load, and the electrochemical device provides electrical power to the load;
• and
• an end of life sensor comprising:
• a sense component comprising a voltage sensor for sensing a voltage of the electrochemical device, said sense component having a positive input, a negative input, and an output, wherein the positive input is connected to the positive terminal of the electrochemical device and the negative input is connected to the negative terminal of the electrochemical device;
• and
• a controller connected to the output of the sense component, the controller receiving a signal from the sense component indicative of the voltage of the electrochemical device, determining whether to provide an indication of an end of life condition as a function of the received signal, and selectively providing an indication of the end of life condition as a function of said determining,
• wherein an average molar ratio of copper to manganese in the copper manganese oxide cathode material is from about about 3:1 to 6:1.

A method of selectively providing an indication of an end of life condition in a cell having a cathode comprising an amorphous or semi-crystalline copper manganese oxide cathode material, said method comprising:

• connecting an electrochemical device comprising the cell to an end of life sensor, wherein the electrochemical device further comprises a positive terminal and a negative terminal, the end of life sensor comprises a positive input and a negative input, and wherein the positive terminal of the electrochemical device is connected to the positive input of the end of life sensor, and the negative terminal of the electrochemical device is connected to the negative input of the end of life sensor;
• sensing a discharge voltage of the electrochemical device via a sense component of the end of life sensor, said sense component comprising a voltage sensor for sensing the discharge voltage of the electrochemical device and providing a signal indicative of the sensed discharge voltage to a controller of the end of life sensor via an output of the sense component;
• determining whether to provide an indication of an end of life condition, said determining being at least in part a function of the signal provided by the voltage sensor to the controller;
• and
• selectively providing an indication of the end of life condition as a function of said determining,
• wherein an average molar ratio of copper to manganese in the copper manganese oxide cathode material is from about 3:1 to 6:1.