Abstract
Layered Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0 ≤ x ≤ 0.08) cathode materials were successfully synthesized by a sol-gel method. X-ray diffraction and the refinement data indicate that all materials have typical α-NaFeO2 structure with R-3m space group, and the a-axis has almost no change, but there is a slight decrease in the c lattice parameter as well as the cell volume. Scanning electron microscopy and high resolution transmission electron microscopy prove that all the samples have uniform particle size of about 200–300 nm and smooth surface. The energy-dispersive X-ray spectroscopy mapping shows that aluminum has been homogeneously doped in the Li1.2Mn0.56Ni0.16Co0.08O2 cathode material. The cyclic voltammetry and electrochemical impedance spectroscopy reveal that appropriate Al-doping contributes to the reversible lithium-ion insertion and extraction, and then reduces the electrochemical polarization and charge transfer resistance. Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x = 0.05) shows the lowest charge transfer resistance and the highest lithium-ion diffusion coefficient among all the samples. The Li-rich electrodes with low-level Al doping shows a much higher discharge capacity than the pristine one, especially the Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x = 0.05) sample, which exhibits greater rate capacity and better fast charge-discharge performance than the other samples. Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x = 0.05) also exhibits higher discharge capacity than the pristine one at each cycle at 55°C. These results clearly indicate that the high rate capacity together with a good high rate cycling performance and high-temperature performance of the low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x=0.05) is a promising alternative to next-generation lithium-ion batteries.
摘要
本文采用溶胶凝胶法成功合成了层状Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08)正极材料. XRD及其精细结果表明, 所有的材料均具有 典型的α-NaFeO2结构, 属于R-3m空间群. Al掺杂后的材料晶胞参数a值几乎不变, 但是c值和晶胞体积略微减小. SEM和HRTEM证明了所有 样品均具有200–300 nm的均一粒径和光滑的表面. EDS谱图说明Al已经成功地进入了Li1.2Mn0.56Ni0.16Co0.08O2正极材料的晶格. CV和EIS说 明适量的Al掺杂有利于锂离子的可逆脱嵌, 减小了材料的电化学极化和电荷转移电阻. 在所有样品中, Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x=0.05) 展示了最小的电荷转移电阻和最高的锂离子扩散系数. 电化学性能测试表明, 少量Al掺杂的富锂电极具有比纯样更高的放电容量, 特 别是Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x=0.05)样品具有比其他样品更高的倍率容量和更好的快速充放电性能. 55°C时, Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x=0.05)展示了比纯样更高的放电容量. 高的倍率容量、好的高倍率循环稳定性以及优秀的高温性能使得低钴Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (x=0.05)材料成为下一代锂离子电池颇具前景的选择.
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Ting-Feng Yi received his BE degree in chemical engineering and technology from Liaocheng University in 2001. He then obtained MSc degree in applied chemistry in 2004 and PhD degree in chemical engineering and technology from Harbin Institute of Technology in 2007. He joined Anhui University of Technology as an assistant professor of chemistry in 2007. He is currently the professor of Anhui University of Technology, China. His research interests include synthesis of electrochemical functional materials and their application in lithium-ion battery and lead-acid battery. For detail please see his researcher ID: http://www.researcherid.com/rid/F-4594-2012.
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Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials
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Yi, TF., Han, X., Yang, SY. et al. Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials. Sci. China Mater. 59, 618–628 (2016). https://doi.org/10.1007/s40843-016-5097-7
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DOI: https://doi.org/10.1007/s40843-016-5097-7