Electrolyte systems for primary lithium-fluorocarbon power sources and their working efficiency in a wide temperature range

New compositions of liquid organic electrolytes with working temperatures of up to - 50 degrees. were developed for low- temperature primary Li/CFx power sources. Five different compositions of organic electrolytes with a 15- crown- 5 (2 vol %) addition and without it were studied on laboratory Li/CFx power sources. 1.LiBF4 (LiPF6) in an ethylene carbonate/dimethyl carbonate/methyl propionate/ethylmethyl carbonate (EC/DMC/MP/EMC) (1 : 1 : 1 : 2) mixture and 1. LiPF6 in an EC/DMC/EMC (1 : 1 : 3) mixture each with a 15- crown- 5 (2 vol %) addition were found to be the best compositions of organic electrolytes with working temperatures of up to - 50 degrees.. The electrochemical tests at 20 and - 50 degrees. in the Li/CFx system showed that the 15- crown- 5 addition increased the length of the discharge plateau at - 50 degrees. three- or fourfold. The mechanisms responsible for the increase in the discharge capacity of the CFx cathode in the presence of a crown ether addition were suggested.