作　　者： ; ;

机构地区： 广东工业大学轻工化工学院

出　　处： 《电子元件与材料》 2017年第2期45-49,共5页

摘　　要： 采用KOH活化石墨烯,通过固相法制备了磷酸铁锂/碱活化石墨烯(LFP/CA-G)复合材料,通过SEM、Raman、XRD和电化学测试对复合材料的结构和性能进行表征,结果表明:通过固相法制备的LFP/CA-G复合材料稳定性较好,在1C倍率下循环50次的容量保持率为100%;LFP/CA-G复合材料的0.2C首次放电比容量为158.8m Ah/g,较磷酸铁锂/石墨烯(LFP/G)提高了3.1 m Ah/g;其3C倍率的放电比容量为139 m Ah/g,较LFP/G提高了7 m Ah/g。LFP/CA-G复合材料具有更好的可逆性,其阻抗更小。这是因为碱活化的石墨烯具有丰富的微孔,有利于缩短锂离子的迁移路径,减小了极化。 Chemically activated graphene（CA-G） was prepared by KOH etching. The LiFePOa/CA-G（LFP/CA-G） composite marterial was successfully prepared by solid-state method, characterized by SEM, Raman, XRD and electrochemical analysis. The results reveal that the obtained LFP/CA-G has excellent cycling stability and the capacity retention is near 100% after 50 cycles at 1C. The initial discharge capacity is 158.8 mAh/g at 0.2C, increased by 3.1 mAh/g than that of LiFePO4/graphene（LFP/G）. The discharge capacity rate of 3C is 139 mAh/g, increased by 7 mAh/g than that of LFP/Ca The LFP/CA-G electrode has smaller resistance and better reversibility. That is because the LFP/CA-G electrode provides abundant porous channels for the diffusion of lithium ions.

关 键 词： 磷酸铁锂 固相法 碱活化石墨烯 复合材料 倍率性能 电化学性能

领　　域： []