介电谱
电化学
分析化学(期刊)
材料科学
扫描电子显微镜
兴奋剂
锂(药物)
磷酸铁锂
阴极
锂离子电池
碳纤维
电极
化学
电池(电)
复合材料
复合数
物理化学
色谱法
物理
内分泌学
功率(物理)
医学
量子力学
光电子学
作者
Guorong Hu,Xu-Guang Gao,Zhongdong Peng,Ke Du,Xian-yan Tan,Yanjun Liu
标识
DOI:10.1016/s1003-6326(07)60088-0
摘要
To improve the performance of LiFePO4, single phase Li1-4xTixFePO4/C (x=0, 0.005, 0.010, 0.015) cathodes were synthesized by solid-state method. A certain content of glucose was used as carbon precursor and content of carbon in every final product was about 3.5%. The samples were characterized by X-ray diffraction(XRD), scanning electron microscopy observations(SEM), charge/discharge test, carbon analysis and electrochemical impedance spectroscopy(EIS). The results indicate that the prepared samples have ordered olivine structure and doping of the low concentration Ti4+ does not affect the structure of the samples. The electrochemical capabilities evaluated by charge-discharge test show that the sample with 1% Ti4+ (molar fraction) has good electrochemical performance delivering about an initial specific capacity of 146.7 mAΔh/g at 0.3C rate. Electrochemical impedance spectroscopy measurement results show that the charge transfer resistance of the sample could be decreased greatly by doping an appropriate amount Ti4+.
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