Factors Affecting the Electrochemical Behaviors of Graphene-Like Graphite as a Positive Electrode of a Dual-Ion Battery.

Charge-discharge behaviors of various graphene-like graphite (GLG) samples have been investigated, and factors affecting them were discussed. By changing the oxidation method of graphite to obtain the precursor material of graphite oxide and heat treatment temperature of it, GLG samples with various structural parameters were successfully prepared. The onset potential of intercalation changed mainly depending on the interlayer spacing and decreased with its increase. The oxygen content was also important especially for GLG with smaller interlayer spacings. The influence of oxygen became apparent when the intercalation of bis(fluorosulfonyl)amide ions was performed. The onset potential considerably decreased for GLG with larger oxygen contents. The capacity of GLG increased with the increase in oxygen content to reach a maximum value of 149 mAh g-1 and then slightly decreased.