溶剂热法合成菱形LiFePO_4/C及电化学性能表征  

Synthesis of rhombus LiFePO_4 /C by solvothermal and its electrochemical properties

作　　者：常玲[1] 王凤先[1] 杜高辉[1] 

机构地区：[1]浙江师范大学物理化学研究所先进催化材料教育部重点实验室,浙江金华321004

出　　处：《电源技术》2013年第10期1733-1735,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(10904129);教育部新世纪优秀人才支持计划(N C E T-11-1081)

摘　　要：以LiO H·H 2O、FeS O 4·7 H 2O、H 3P O 4为原料,采用溶剂热法合成了菱形的锂离子电池正极材料磷酸铁锂。以葡萄糖为碳源,在A r气氛下制备了表面均匀包覆碳的菱形LiFeP O 4/C正极材料,并对材料进行了X射线衍射(X R D)、扫描电子显微镜(S E M)、透射电子显微镜(TE M)分析。通过恒电流充放电测试研究了LiFeP O 4/C的电化学性能。实验结果表明材料的首次放电比容量为151.1 m A h/g(0.1 C);其倍率性能测试结果为:0.2 C、0.5 C、1 C、2 C和5 C的首次放电比容量分别为150.8、134.5、121.0、134.5和93.1 m A h/g,表现出了良好的倍率性能。As cathode material of lithium ion battery, LiFeP04 was synthesized through solvothermal method with the raw materials of LiOH .H20, FeSO4.7 H^O and H3PO4. LiFePO4/C was synthesized in the atmosphere of Ar and glucose was used as carbon source. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） were used to characterize the structure and morphology of the product. The LiFePOJC cathode material delivers an initial discharge specific capacity of 151.1 mAh/g at 0.1 C. The sample delivers discharge specific capacity of 150.8, 134.5, 121.0, 134.5 and 93.1 mAh/g at 0.2 C, 0.5 C, 1 C, 2 Cand 5 C, respectively, exhibiting excellent rate performance.

关 键 词：锂离子电池 正极材料 磷酸铁锂 溶剂热法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]