Accelerated Aging of Thermally Activated Batteries Which Utilize the Li(Si)/LiCl-KCl/FeS sub 2 System

摘要

Sandia Laboratories is developing Li(Si)/FeS sub 2 thermally activated batteries for applications that require high reliability and a shelf life of twenty-five years. To determine the feasibility of achieving these requirements, an accelerated aging study was undertaken. The major objective of this work was to identify deleterious chemical reactions that could affect performance and reliability during the twenty-five year shelf life. The approach used was to accelerate the aging of batteries by storage at elevated temperature, and then to examine and analyze materials from some batteries, while discharging others. A battery design that used no organic materials (except for those in an electrical match) was chosen in order to minimize the number of possible deleterious reactions. The reaction of Li(Si) with water outgased from the various battery parts was the only effect deleterious to shelf life that was noted. 4 figures, 4 tables. (ERA citation 05:020693)