Industry has dictated a growing need for cells and batteries capable of sustained use and storage in elevated temperature environments. This usage varies from short term exposures for surface mount technology, to the long term service environments of the automotive industry for computer memory backup.The storage temperature for typical lithium carbonmonofluoride (Li/CFx) cells range from -40°C to +6OoC. Accelerated thermal testing has identified three primary failure modes for the standard design as: electrolyte diffusion through the seal, degradation of the polymeric seal material, and internal component corrosion/degradation. All three of these failure modes are essentially related.The electrochemical couple itself should be capable of functioning up to 181°C for the lithium and 450-650°C for the carbon-monofluoride. The lithium of this cell system can further be modified by alloying for increased thermal stability.(Li/CFx) coin cell system has been optimized for high temperature (1 25°C) applications. The optimization was accomplished utilizing the standard BR1225 cell size as a test vehicle. An unique electrolyte formulation and polymeric seal material have resulted in cells that tolerate temperatures up to 125°C for a year without substantial degradation in performance.
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