The Anode Material Post-processing Technology And Its Application In Thermal Battery Research

The post-processing of cathode material (FeS2and CoS2) is a key technology for the thermal battery of Li//FeS2(CoS2). Its main function is to control the voltage accuracy of the thermal battery during the initial discharging. The post-processing includes two parts:activation and lithiation. Cathode materials were post-processed using various methods, and they were characterized via physical and chemical analysis. Their influence on the electrochemical performance of the thermal batteries was tested. The mechanisms of the post-processing on electrochemical performance were discussed. The engineering application of the post-processing technology was also tried.The research includes the following aspects:1. Activation of the cathode material by high temperature treatment at inert atmosphere. The activation improves the safety of the thermal battery and electrochemical performance at medium or high load discharge by reducing high voltage wave at initial discharge without load.2. Adding Si-Ca alloy powder, Li-Si alloy powder or Li2O at the selective situation of vapor catalyst or high temperature treatment can further improve the voltage accuracy during the initial discharging, and also influence the other important electrochemical performance. However, none of the lithiation ways has comprehensive advantages.3. Using "double electronic layers electrodynamics effects" to explain the forming and disappearing of the initial high voltage wave.4. Choosing two lithiation samples of better performance to make thermal batteries for engineering testing. It was found that the lithiation of adding Li2O for high temperature treatment has better comprehensive performance.