LiFePO3.92F0.08/C的合成、表征和电化学性能研究

人工晶体学报, 2014, 43(9): 2307-2318.

LiFePO3.92F0.08/C的合成、表征和电化学性能研究

于鹏飞 ^1, , 靳云霞 ^2, , 李玉珠 ^3, , 吴春丹 ^4, , 肖顺华 ^5,

1.桂林理工大学化学与生物工程学院,桂林541006

2.桂林理工大学化学与生物工程学院,桂林541006

3.桂林理工大学化学与生物工程学院,桂林541006

4.桂林理工大学化学与生物工程学院,桂林541006

5.桂林理工大学化学与生物工程学院,桂林541006

基金项目: Science Technology Research Projects of Guangxi Institution of Higher Education(2013ZD030) National Natural Science Foundation of China(51364008) Guangxi Natural Science Foundation(2014GXNSFAA118046)

关键词： LiFePO3.92F0.08/C , 固相法 , 电子电导率 , 放电比容量

Synthesis, Characterization and Electrochemical Performances of LiFePO3.92 F0.08/C

Keywords： LiFePO3.92F0.08/C , solid state method , electron conductivity , discharge specific capacity

通过两步固相法反应制备LiFePO4/C和LiFePO3.92F0.08/C.采用XRD、红外(FHR)、扫描电镜(SEM)、X射线能谱(EDS)对样品的结构和形貌进行分析.结果表明LiFePO3.92F0.08/C中有F的分布并且仍然保持橄榄石结构,但是具有了更好的倍率性能和循环稳定性能.LiFePO3.92F0.08/C在不同倍率下的首次放电比容量分别为154.9(0.2C)、124.3(1 C)、83.2 mAh/g(10 C).特别是在1C倍率下循环30次后,放电比容量仍达122.1 mAh/g,容量损失仅为2.16％.F-掺杂能够提高材料电子电导率和锂离子扩散系数进而显著改善其电化学性能.

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