混合铁源制备碳包覆磷酸铁锂  

Preparing carbon coated lithium ferrous phosphate using mixed iron sources

作　　者：王伟[1] 赵领[1] 张峥[1] 刘兴泉[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,四川成都610054

出　　处：《电池》2014年第1期24-27,共4页Battery Bimonthly

基　　金：国家自然科学基金(21071026);电子科技大学杰出人才引进项目(08JC00303)

摘　　要：以FeC2 O4＆#183;2H2 O和FePO4作为混合铁源，采用高温固相法制备锂离子电池正极材料碳包覆磷酸铁锂（LiFePO4/C）。采用SEM、XRD、恒电流充放电测试和交流阻抗谱对材料的表面形貌、物相结构和电化学性能进行了分析。在700℃、混合铁源n（FeC2 O4＆#183;2H2 O）∶n（FePO4）＝1∶1时制备的LiFePO4/C的电化学性能较好。在2.5～4.1 V充放电，0.2 C时的放电比容量为165.9 mAh/g，2.0 C首次和第20次循环的放电比容量分别为135.3 mAh/g、141.9 mAh/g。Carbon coated lithium ferrous phosphate（LiFePO4/C）as cathode material of Li-ion battery was synthesized by solid state reaction method using mix iron sources. The surface morphology,crystal structure and the electrochemical performance were charac-terized by SEM,XRD,charge-discharge testing and electrochemical impedance spectra（EIS）. The composite synthesized at 700 ℃with mixed iron sources n（FeC2 O4＆#183;2H2 O）∶n（FePO4 ）=1∶1 had better electrochemical performance,when charged-discharged in 2.5 ~4.1 V,the 0.2 C specific discharge capacity was 165.9 mAh/g,the specific discharge capacity in the initial and 20th cycle at 2.0 C was 135.3 mAh/g and 141.9 mAh/g,respectively.

关 键 词：磷酸铁锂(LiFePO4) 正极材料 混合铁源 碳包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]