固相法合成LiFePO_4/C正极材料的电化学性能  

Electrochemical performance of LiFePO_4/C cathode materials synthesized by solid-state reaction

作　　者：王国宝[1] 王先友[1] 舒洪波[1] 王英平[1] 杨顺毅[1] 刘修明[1] 裴斧[1] 王雁生[1] 安红芳[1] 郑丽萍[1] 陈权启[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用教育部重点实验室,湘潭411105

出　　处：《中国有色金属学报》2010年第12期2351-2356,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(20871101);科技部火炬计划资助项目(2009GJD20021);湖南省科技厅重点攻关资助项目(2009WK2007);湖南省自然科学市州联合基金重点资助项目(09JJ8001)

摘　　要：以廉价原材料FeSO4·7H2O为铁源,以蔗糖为碳源,采用固相法合成了锂离子电池正极材料——LiFePO4/C复合材料。用X射线衍射(XRD)、扫描电镜(SEM)和电化学测试技术对不同铁源合成的LiFePO4/C复合材料的结构、形貌和电化学性能进行研究。结果表明:合成的样品具有均一的橄榄石型结构,以FeSO4·7H2O为铁源合成的LiFePO4/C复合材料的循环性能和高倍率放电性能均优于以FeC2O4·2H2O为铁源合成的LiFePO4/C复合材料的;由FeSO4·7H2O合成的LiFePO4/C复合材料的5C倍率放电比容量为105.9mA·h/g,经循环30次后,容量仍高达105.2mA·h/g。The lithium ion battery cathode material LiFePO4/C composite was prepared by a solid-state method using the low cost FeSO4·7H2O as iron source and sucrose as carbon source. The structure,morphology and electrochemical performance of the LiFePO4/C samples prepared with different iron sources were investigated by X-ray diffraction （XRD）,scanning electron microscopy （SEM） and electrochemistry techniques. The results show that the resultant LiFePO4/C has homogeneous olivine structure. And the capacity and cycle ability of LiFePO4/C prepared from FeSO4·7H2O are higher than that of LiFePO4/C composite synthesized by a traditional solid-state method using FeC2O4·2H2O as iron source. The capacity is 105.9 mA·h/g at 5C rate and remained 105.2 mA·h/g after 30 cycles.

关 键 词：LIFEPO4/C复合材料 铁源 锂离子电池 正极材料 

分 类 号：O646[理学—物理化学]