Working temperature maintenance of thermal batteries by using a slow heat supply component with layer structure and its positive effect on the improvement of electrochemical performance

摘要

The discharge performance of thermal batteries with long-life is mainly limited by the decrease of working temperature, due to the continuous heat release during the work process. In this contribution, we firstly propose a slow heat-supply component (SHSC) with layer structure, composed of reducers (Li-Si), oxidizers (CuO) and "lithium" permeation membrane (LPM), to compensate the released heat in thermal batteries. The LPM is composed of electronic conductor (CeO2) and high Li+ molten salt conductor (LiCl-LiBr-KBr), which can modify the permeation rate of "lithium" by changing the electric conductivity. The results confirm that thereaction rates between Li-Si and CuO can be adjusted by changing the weights or compositions of LPM, and the heat supply rate of SHSC can be regulated. By using SHSC, the inner temperature of thermal batteries can be maintained properly. Moreover, the discharge capacity of thermal batteries with long working life, can achieve 10% increase at least, with SHSC as the heat supplied component, which are measured and confirmed in the real thermal batteries.