▎ 摘　　要

The fabrication of graphite/Li and graphene/Li cells, electrochemical characterization of these cells, and assessment of a mixture of 1M LiPF6 and carbonate solvents (ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), sulfolane (SL), and fluoroethyl carbonate (FEC)) were the main topics of this study. According to morphological studies, graphene had a far larger effective surface area and porosity than graphite. According to electrochemical tests utilizing CV and EIS techniques, graphene had a higher storage capacity than ultra-thin graphite. The researchers found that graphene has excellent rate capability and can facilitate charge transfer during discharge-charge actions. Study charge/discharge profiles at the current density of 200 mA g-1 in the electrolyte of 1M LiPF6 containing EMC/EC/DEC/DMC with a volume ratio of 1:1:5:2 (1M LiPF6 + (EMC/EC/DEC/DMC 1:1:5:2)) as optimal stoichiometry of EC, DEC, DMC, EMC solvents showed that for graphite, the first-cycle discharge and charge capacities were 138 and 111 mAh g-1, respectively, and for graphene, the corresponding capacities were enhanced to 143 and 117 mAh g-1 respectively. Moreover, results showed graphene electrode in graphene/Li cell using 1M LiPF6 containing (EMC/EC/DEC/DMC/SL 1:1:5:2:1) and (EMC/EC/DEC/DMC/FEC 1:1:5:2:1) showed that excellent specific capacity more than 124 mAh g-1 and good stability over 500 cycles were obtained for electrolyte solution containing EMC/EC/DEC/DMC/SL with volume ratio of 1:1:5:2:1, and the SL-mixed solution can be employed at high potential (5.3 V vs Li/Li+).