Solid-state nuclear magnetic resonance studies of electrochemically discharged CFx

Electrochemical studies of three types of CF x (F - Fiber based, C - Petroleum coke based, G - Graphite based) have demonstrated different electrochemical performances types in previous work, with fiber based CF x delivering superior performance over those based on petroleum coke and graphite. 13 C and 19 F MAS (Magic Angle Spinning) NMR techniques are employed to identify the atomic/molecular structural factors that might account for differences in electrochemical performance among the different types of CF x . Small quantitative variations of covalent CF and LiF are noted as a function of discharge and sp 3 bonded carbons are detected in discharged F type of CF x .