Here are some good links about lithium/thionyl chloride cells
http://www.batteryeng.com/func_perf.htm#Chemistry (http://www.batteryeng.com/func_perf.htm#Chemistry)
http://www.batteryeng.com/batt_ani.htm (http://www.batteryeng.com/batt_ani.htm)
Unfortunately, the chemistry books that I have do not go into much detail with regards to thionyl chloride, so for that reason I am asking about ways of extraction/ seperation from the Li salts in the electrolyte.