黄铁矿FeS_2/石墨烯复合材料的电化学性能研究

Electrochemical properties of FeS_2/graphene composites

采用混合溶剂热法一步合成出黄铁矿FeS_2及FeS_2-RGO复合物,并研究其作为锂离子电池负极材料的电化学性能。使用X射线衍射分析(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、充放电测试、循环伏安测试(CV)和电化学交流阻抗测试(EIS)对材料的结构、形貌和电化学性能进行表征。在0.01~3V电压区间,100mA/g电流密度下,FeS_2样品首次的放/充电比容量为1 221.7/1 053.4mAh/g,充放50圈后,容量剩余563.3mAh/g,而FeS_2-RGO样品首次放/充电比容量为1 326.8/1 057 mAh/g,充放50圈后,容量保持在1 239mAh/g。通过石墨烯复合有效地提高了黄铁矿FeS_2的电化学性能。

Pyrite FeS2 and FeS 2-RGO composites were synthesized by a one-step mixing solvothermal method,and their electrochemical properties as anode electrode materials for lithium ion batteries were investigated.Structure,morphology and electrochemical properties of materials were characterized by using X-ray diffraction(XRD)analysis,scanning electron microscopy(SEM),transmission electron microscopy(TEM),charge-discharge test,cyclic voltammetry(CV)and electrochemical impedance test(EIS).FeS2 samples delivered an initial discharge/charge capacity of 1 221.7/1 053.4 mAh/g and maintained a discharge capacity of 563.3 mAh/g after 50 cycles between 0.01-3 V at a current density of 100 mA/g.FeS 2-RGO samples delivered an initial discharge/charge capacity of 1326.8/1057 mAh/g and maintained a discharge capacity of 1 239 mAh/g after 50 cycles between 0.01-3 V at a current density of 100 mA/g.The electrochemical performance of FeS 2 can be effectively improved by graphene compsite.