超级电容器用石墨烯极片的制备和性能

Preparation and properties of graphene for supercapacitor application

以石墨粉为原料，通过简便的氧化还原法制备了石墨烯。将石墨烯极片在有机电解液体系中组装成超级电容器。利用XRD、SEM对制备的石墨烯电极进行物相和形貌分析。采用恒电流充放电、循环伏安和交流阻抗对所制备超级电容器的电容性能进行了研究。结果表明，石墨烯电极超级电容器比天然石墨制备的超级电容器的比电容有了明显的提高；在电流密度为200mA／g，电压区间为1.25～2．5V下循环888次后比电容保持在45．5F／g，容量保持率在85．5％，表明石墨烯材料制备的电容器具有较好的充放电循环性能。

Ahstraet.Graphene were prepared by simple redox method using graphite as raw materials. Supercapacitors were fabricated using the as-prepared graphene as electrode in organic electrolyte . The phase and morphology were characterized by XRD and SEM methods. The performance of supercapacitors were analyzed using gal- vanostatic charging and discharging testing, cyclic vohammetry and electrochemical impedance spectroscopy. The results showed that graphene-based supercapacitors had larger values of specific capacitance than that of the natural graphite-based ones. The specific capacitance was 45.5F/g （rentention rate at 85.5 %） after 888 char- ging and discharging cycles at the current density of 200mA/g between the voltage from 1.25 to 2.5V. The gra- phene-based supercapacitors have a good charge-discharge cycle performance.