| abstract |
The invention relates to heterocyclic sulfonyl fluoride additives for the electrolytic composition of lithium batteries. An electrolytic composition contains • (i) at least one aprotic organic solvent; • (ii) at least one conductive salt; (Iii) at least one compound of formula (I) wherein R 1 , R 2 and R 3 are each independently H or a C 1 -C 20 hydrocarbon group which may be unsubstituted or substituted by one or more substituents selected from F, CN, OS (O) 2 F and S (O) 2 F and which may contain one or more groups selected from -O-, -S-, -C (O) O-, -OC (O) - and -OS (O) 2 -; at least one of R 1 , R 2 and R 3 being substituted with one or more S (O) 2 F groups; and • (iv) optionally one or more additives. |