Lithium thionyl chloride batteries
Highest energy density of all primary batteries
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For modern electronic devices, it is a secure energy source with high cell voltage and energy density for maximum reliability even at high power consumption and in extreme temperature conditions.
Typical applications are the off-grid power supply of electronics in military and industrial applications, security technology, and utility meters. A wide range of sizes (round cells and prismatic cells) are available as a high-power battery.
The lithium thionyl chloride battery (Li − SOCl2) is a non-rechargeable lithium battery with lithium as an anode and a graphite electrode as a cathode, wherein the thionyl chloride is cathodically reduced and serves as both a solvent and an electrolyte.
The nominal voltage of such a cell is about 3.6 V, which remains nearly constant throughout the discharge time. Its maximum energy density among all primary batteries of up to 650 Wh/kg is outstanding. A particularly long shelf life and service life is achieved by the hermetically-sealed housing, using a glass seal for example.