A comparison of three Li/SOCl2 batteries with Different duration of using which used as the power source in gas meters

Lithium/thionyl chloride (Li/SOCl2) battery are considered promising power sources because of their high energy density, high operation voltage, long storage life and wide operationtemperature range [1]. With these advantages, Li/SOCl2 primary battery, as one of the most important primary batteries, has been widely used with low power consumption applications in civil, military areas and electronic meters such as gas meters and water meters [2]. The Li/SOCl2battery system consists of a Li anode, a carbon cathode, and the LiAlCl4/SOCl2 electrolyte solution. During the discharge of the Li/SOCl2 battery, Li+ ions around the lithium electrodemigrate to the carbon electrode surface and react with the Cl- anion thereupon LiCl film isformed on the cathode. deposition of LiCl clogged the porous carbon cathode and This film on the surface of the carbon electrode appears to be an important factor influencing the cathodicprocess and cell performance. In this paper three commercial SAFT Li/SOCl2, D size battery used to investigate andevaluated by electrochemical techniques. three candidate batteries and the codes used for each battery types are listed in table.1. voltage of each battery measured before I-V test. Fig.1 is a comparative I-V curves of three candidate batteries. S3 candidate battery was used as a powersource in a gas meter for longer time compared with S1 that used for less time. S1 which have low resistance and high voltage is better in performance because of low amount of lithium chloride crystals on the surface of carbon. S3 which have high resistance and low voltage is worstin performance because of high amount of lithium chloride crystals on the surface of carbon cathode. There is no I-V curve for S1 battery because of very low voltage.

A comparison of three Li/SOCl2 batteries with Different duration of using which used as the power source in gas meters Keywords:

Discharge time , Power source , Gas meter , SAFT Li/SOCl2 battery , Electrochemical techniques