无定型FePO_4/KB的制备及其储钠性能  

Preparation of Amorphous FePO_4/ KB and Its Sodium Storage Performance

作　　者：潘迎芬[1] 蔡春平[1] 陈瑞辉[1] 徐国庆[2] 

机构地区：[1]福建出入境检验检疫局,福建福州363401 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《广州化工》2015年第23期85-87,共3页GuangZhou Chemical Industry

基　　金：国家质量监督检验检疫总局科技项目(2014IK189)

摘　　要：采用硫酸亚铁铵作为铁源,在反应过程中引入导电剂科琴黑(KB),结合水热和煅烧的方法分两步制备了FePO_4/KB复合材料。通过XRD和SEM对合成的产物进行了结构和形貌分析,并采用循环伏安法和充放电测试考察了FePO_4/KB在钠离子电池中的电化学性能。研究结果显示,合成的材料在20mA·g^(-1)电流密度下首次放电容量能达到111.3mAh·g^(-1),除了第二次循环容量出现衰减外,该材料在之后的循环中放电容量呈逐渐上升的趋势,循环60次后放电容量达到86.6mAh·g^(-1)。FePO_4/ KB composite was synthesized using（NH_4）_2Fe（SO_4）_2as Fe sources via a hydrothermal method combined with subsequent annealing process. XRD and SEM were used to characterize the structure and morphology of the as-prepared composite. The electrochemical performance of Fe PO_4/ KB electrode was tested by cyclic voltammetry（ CV）and galvanostatic charge / discharge tests. The results showed that the initial discharge capacity of 111. 3 m Ah·g^（-1）could be achieved for FePO_4/ KB at a current density of 20 m A·g^（-1）. Note that an obvious capacity fading was observed in the first two cycles and the electrode demonstrated good reversibility with the capacity of 86. 6 m Ah·g^（-1）remaining after 60 cycles.

关 键 词：磷酸铁 钠离子电池 硫酸亚铁铵 KB 

分 类 号：O614.81[理学—无机化学]