Surfactant effect on synthesis of core-shell LiFePO4/C cathode materials for lithium-ion batteries
Surfactant effect on synthesis of core-shell LiFePO4/C cathode materials for lithium-ion batteries
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表面活性剂对锂离子电池核壳LiFePO4/C正极材料合成的影响
DOI：
10.1007/s10008-014-2598-5
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发表时间：
2014
影响因子：
2.5
通讯作者：
Li Qing-Yu
中科院分区：
文献类型：
--
作者：
Wang Hong-Qiang;Zhang Xiao-Hui;Zheng Feng-Hua;Huang You-Guo;Li Qing-Yu
以低成本的FeOOH为铁源，聚氧乙烯山梨醇单铝酸酯（Tween 40）为表面活性剂，采用包括高能磨矿和热解步骤的固液反应磨矿法合成了具有均匀碳包覆层（核壳结构表示为LiFePO4/C）的纳米球形LiFePO4颗粒。x射线粉末衍射（XRD），傅里叶变换红外光谱（FTIR），场发射扫描电子显微镜（SEM）和透射电子显微镜（TEM）用于结构，形貌和成分表征。XRD和FTIR结果均证实了表面活性剂分子与前驱体之间存在相互作用，有利于形成平均粒径约为200 nm、丝锥密度高达1.7 g cm−3的核壳结构。采用电化学阻抗谱（EIS）、充放电和循环测试等方法研究了LiFePO4/C作为正极材料的电化学性能。结果表明，LiFePO4/C在室温（25°C）和零下（- 20°C） 0.1°C条件下的放电容量分别达到163.6和131.3 mAh g−1。此外，该材料还表现出优异的循环性能，在25°C下循环120次后，容量保持率为98.8%(0.1°C)，在第200次循环结束时，容量保持率为102.9 mAh g−1，对应于每循环衰落0.01%。
Nanospherical LiFePO4particle with a uniform carbon coating layer (core-shell structure expressed as LiFePO4/C) in the presence of both low-cost FeOOH as iron resource and polyoxyethylene sorbitan monopalmitate (Tween 40) as surfactant is synthesized via a solid–liquid reaction milling method consisting of high-energy milling and pyrolysis steps. X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (SEM), and transmission electron microscopy (TEM) are used for structure, morphology, and composition characterization. Both XRD and FTIR results confirm the existence of interactions between surfactant molecules and precursor, which can benefit the formation of the core-shell structure with an average particle size of about 200 nm and a high tap density of 1.7 g cm−3. The electrochemical properties of as-prepared LiFePO4/C as cathode material are investigated by electrochemical impedance spectroscopy (EIS), charge–discharge, and cycling tests. The results show that the LiFePO4/C can achieve high discharge capacities of 163.6 and 131.3 mAh g−1under 0.1 °C at room temperature (25 °C) and sub-zero temperature (−20 °C), respectively, due to its improved conductivity. In addition, the material also shows an excellent cycling performance with capacity retention of 98.8 % (0.1 °C) after 120 cycles at 25 °C and 102.9 mAh g−1at the ends of the 200th cycle corresponding to a fading of 0.01 % per cycle.
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影响因子：
5.2
作者：
Yongming Zhu;Shenzhi Tang;Haihao Shi;Huili Hu
通讯作者：
Yongming Zhu;Shenzhi Tang;Haihao Shi;Huili Hu
影响因子：
6.2
作者：
Hui Liu;Jing-ying Xie;Ke Wang
通讯作者：
Hui Liu;Jing-ying Xie;Ke Wang
DOI：
10.1002/pssa.200521452
发表时间：
2006-01
期刊：
physica status solidi (a)
影响因子：
--
作者：
A. Ait-Salah;K. Zaghib;A. Mauger;F. Gendron;C. Julien
通讯作者：
A. Ait-Salah;K. Zaghib;A. Mauger;F. Gendron;C. Julien
影响因子：
5.4
作者：
Gaberscek, Miran;Dominko, Robert;Jamnik, Janez
通讯作者：
Jamnik, Janez
影响因子：
64.8
作者：
Kang, Byoungwoo;Ceder, Gerbrand
通讯作者：
Ceder, Gerbrand