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LiFe_(0.95)Ni_(0.02)Mn_(0.03)PO_4/C的合成及电化学性能

Synthesis of LiFe_(0.95)Ni_(0.02)Mn_(0.03)PO_4/C and its electrochemical properties
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摘要 采用高温固相法合成Ni2+、Mn2+共掺杂的LiFe0.95Ni0.02Mn0.03PO4/C正极材料。通过X射线衍射(XRD)、扫描电镜(SEM)、电化学阻抗谱(EIS)和电化学测试技术等研究材料的结构、形貌和电化学性能。结果表明:Ni2+和Mn2+共掺杂后的LiFe0.95Ni0.02Mn0.03PO4/C材料仍然具有LiFePO4/C橄榄石型晶体结构,且掺杂后材料的放电比容量和循环性能都得到显著改善。在0.1C和1C下放电时,未掺杂LiFePO4/C的首次放电比容量仅分别为153和140 mA.h/g,而Ni2+、Mn2+共掺杂的LiFe0.95Ni0.02Mn0.03PO4/C材料首次放电比容量分别为165和145 mA.h/g,且在1C下循环100次后容量保持率仍然为97.6%。 LiFe0.95Ni0.02Mn0.03PO4/C cathode material co-doped by Ni2+and Mn2+ions,was prepared by high temperature solid phase method.The structure,morphology and electrochemical properties of the as-prepared material were characterized by XRD,SEM,EIS and charge-discharge methods.The results show that the as-prepared LiFe0.95Ni0.02Mn0.03PO4/C keeps the olivine structure of LiFePO4/C,and the discharge specific capacity and cyclic stability are obviously enhanced.The initial discharge capacities of LiFePO4/C without doping are only 153 and 140 mA.h/g at 0.1C and 1C,respectively.While the initial discharge capacities of LiFe0.95Ni0.02Mn0.03PO4/C co-doped with Ni2+ and Mn2+ are 160 and 145 mA.h/g at 0.1C and 1C,respectively.Besides,the capacity retention still has 97.6% after 100 cycles.
作者 吴强 王先友 舒洪波 杨顺毅 王英平 杨秀康 白艳松 魏启亮
机构地区 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
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2012年第12期3482-3486,共5页 The Chinese Journal of Nonferrous Metals
基金 国家自然科学基金资助项目(20871101) 科技部科技计划项目(2009GJD20021) 湖南省高校产业化培育项目(10CY005)
关键词 锂离子电池 正极材料 金属离子共掺杂 电化学性性能 lithium-ion battery cathode material metal ions co-doping electrochemical properties
分类号 O646 [理学—物理化学]
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参考文献18

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二级参考文献46

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中国有色金属学报
2012年 第12期

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