掺杂Mg的LiFePO_4电化学性能研究  

Studies on electrochemical behavior of Mg-doped LiFePO_4

作　　者：谭显艳[1] 胡国荣[1] 高旭光[1] 彭忠东[1] 陈召勇[1] 禹筱元[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《电池》2004年第5期344-345,共2页Battery Bimonthly

摘　　要：通过高能球磨制备前驱体,采用煅烧法合成锂离子电池正极材料磷酸铁锂(LiFePO4),采用充放电性能测试、XRD表征材料性能。实验证明:LiFePO4具有3 45V(vs Li/Li+)的放电电压平台。在相同的工艺条件下合成掺杂和未掺杂镁的LiFePO4样品,测试了它们的电化学性能,掺杂少量Mg2+后的LiFePO4晶体结构并未发生变化,且较未掺杂的LiFePO4具有更好的电化学性能。Li-ion battery cathode material lithium iron(Ⅱ) phosphate (LiFePO_4) was synthesized by calcining the precursor prepared by high energy ball milling. Charge-discharge test and XRD diffraction analysis were applied to test its performance. The results showed that active material had 3.45 V(vs.Li/Li^+) discharge flat voltage. The electrochemical characterizations of LiFePO_4 and Mg-doped LiFePO_4 in the same technical conditions were measured. The addition of small numbers of Mg^(2+) had no effect on the structure of lithium iron phosphate while the cathode material showed better electrochemical performance.

关 键 词：锂离子电池 电池材料 磷酸铁锂 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]