A range of methyl 2-fluorocyanoester derivatives were synthesized from dimethyl 2-fluoromalonate ester and their efficacy as additives in lithium ion battery (LIB) electrolytes was determined. The role played by the 2-fluorocyanoester additives on battery performance was explored by linear sweep cyclic voltammetry, NMR, GCMS and XPS techniques. For all fluorocyanoester additives studied, initial reduction of the carbonyl group occurs which is then followed by formation of the corresponding radical anion. Possible degradation routes arising from loss of fluoride ion, loss of methyl radicals and cleavage of the carbon-carbon bond were
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