Improved Electrochemical Performance of 0.5Li(2)MnO(3)·0.5LiNi(0.5)Mn(0.5)O(2) Cathode Materials for Lithium Ion Batteries Synthesized by Ionic-Liquid-Assisted Hydrothermal Method.
Improved Electrochemical Performance of 0.5Li(2)MnO(3)·0.5LiNi(0.5)Mn(0.5)O(2) Cathode Materials for Lithium Ion Batteries Synthesized by Ionic-Liquid-Assisted Hydrothermal Method.
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离子液体辅助水热法合成0.5Li(2)MnO(3)中心点0.5LiNi(0.5)Mn(0.5)O(2)锂离子电池正极材料的电化学性能改善
DOI：
10.3389/fchem.2020.00729
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发表时间：
2020
影响因子：
5.5
通讯作者：
Wu X
中科院分区：
文献类型：
--
作者：
Xiang Y;Jiang Y;Liu S;Wu J;Liu Z;Zhu L;Xiong L;He Z;Wu X
在n-己基四氟硼酸吡啶离子液体（[HPy][BF4]）存在下，采用水热法制备了分散良好、富锂的mn基0.5Li2MnO3·0.5LiNi0.5Mn0.5O2纳米颗粒，粒径在50 ~ 100 nm之间。采用x射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和电化学测量对制备的正极材料的微观结构和电化学性能进行了表征。XRD结果表明，离子液体辅助水热法制备的样品呈现出典型的富锂锰基纯相和低阳离子混合。SEM和TEM图像表明，离子液体辅助样品的颗粒团聚程度低于传统的水热样品。电化学测试结果表明，离子液体辅助水热法合成的材料具有较好的倍率性能和可循环性。电化学阻抗谱（EIS）结果表明，离子液体辅助水热法制备的0.5Li2MnO3·0.5LiNi0.5Mn0.5O2的电荷转移电阻较低，提高了反应动力学。
Well-dispersed Li-rich Mn-based 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 nanoparticles with diameter ranging from 50 to 100 nm are synthesized by a hydrothermal method in the presence of N-hexyl pyridinium tetrafluoroborate ionic liquid ([HPy][BF4]). The microstructures and electrochemical performance of the prepared cathode materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical measurements. The XRD results show that the sample prepared by ionic-liquid-assisted hydrothermal method exhibits a typical Li-rich Mn-based pure phase and lower cation mixing. SEM and TEM images indicate that the extent of particle agglomeration of the ionic-liquid-assisted sample is lower compared to the traditional hydrothermal sample. Electrochemical test results indicate that the materials synthesized by ionic-liquid-assisted hydrothermal method exhibit better rate capability and cyclability. Besides, electrochemical impedance spectroscopy (EIS) results suggest that the charge transfer resistance of 0.5Li2MnO3· 0.5LiNi0.5Mn0.5O2 synthesized by ionic-liquid-assisted hydrothermal method is much lower, which enhances the reaction kinetics.
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