掺钴对富锂磷酸亚铁锂大电流放电性能的影响  

Influence of cobalt doping on the discharge performance of lithium iron phosphate at high rate

作　　者：常美娟[1] 陈梅蓉[1] 韩铭[1] 姜祥祥[1] 施继成[1] 童庆松[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《吉林化工学院学报》2012年第1期4-8,共5页Journal of Jilin Institute of Chemical Technology

基　　金：科技部科技人员服务企业项目(2009GJC40003);福建省科技厅重点项目(2010I0005)

摘　　要：采用固相法制备了具有橄榄石型结构的微米Li1.12Fe0.98Co0.02PO4/C样品.通过充放电循环、循环伏安实验、交流阻抗、XRD衍射、红外光谱、扫描电镜等现代技术研究了制备的样品的电化学性能.研究表明,在2 C倍率电流下,制备的Li1.12FePO4/C和Li1.12Fe0.98Co0.02PO4/C样品第1循环的放电容量分别为64.8和108.9 mAh.g-1,第30循环的放电容量分别为67.3和110.1 mAh.g-1.因此,掺钴的富锂Li1.12Fe0.98Co0.02PO4/C样品具有明显改善的大电流放电性能.A Li1.12Fe0.98Co0.02PO4/C composite with the micrometer size was synthesized by a solid state reaction. The as-prepared composite was characterized by charge-discharge tests, cyclic vohammetry, electrochemical impedance spectroscope, XRD patterns, infrared spectroscopy and scanning electron microscope method. The experimental results show that Li1.12Fe0.98Co0.02PO4/C delivers a capacity of 108.9 mAh ·g^-1 in the 1st cycle and 110.1 mAh ·g^-1 in the 30th cycle at 2 C rate,respectively. Cobalt doping obviously improves the discharge performance of lithium iron phosphate at high rate current.

关 键 词：高倍率放电 磷酸亚铁锂 钴掺杂剂 放电 

分 类 号：O614.711[理学—无机化学]