Deep Eutectic Solvent Synthesis of LiMnPO₄/C Nanorods as a Cathode Material for Lithium Ion Batteries.
Deep Eutectic Solvent Synthesis of LiMnPO₄/C Nanorods as a Cathode Material for Lithium Ion Batteries.
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深共晶溶剂合成 LiMnPO4/C 纳米棒作为锂离子电池正极材料
DOI：
10.3390/ma10020134
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发表时间：
2017-02-06
期刊：
影响因子：
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通讯作者：
Wen YX
中科院分区：
文献类型：
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作者：
Wu Z;Huang RR;Yu H;Xie YC;Lv XY;Su J;Long YF;Wen YX
在氯化物/乙二醇基低共熔溶剂（DES）中，在130℃、常压下4小时成功合成了橄榄石型LiMnPO4/C纳米棒。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、拉曼光谱、傅里叶变换红外光谱 (FTIR) 和电化学测试对合成样品进行了表征。制备的LiMnPO4/C纳米棒表面涂覆有薄碳层（约3 nm厚），长度为100-150 nm，直径为40-55 nm。所制备的棒状LiMnPO4/C在1 C下循环100次后，放电容量为128 mAh·g−1，容量保持率约为93%。即使在5 C下，其放电容量仍为106 mAh·g−1，表现出良好的倍率性能和循环稳定性。这些结果表明，氯化物/乙二醇基低共熔溶剂 (DES) 可以作为新型晶面抑制剂来调节 LiMnPO4 的取向生长和形貌。此外，低共熔溶剂提供了控制颗粒尺寸和形貌的新途径，在特殊形貌电极材料的合成中具有广泛的应用。
Olivine-type LiMnPO4/C nanorods were successfully synthesized in a chloride/ethylene glycol-based deep eutectic solvent (DES) at 130 °C for 4 h under atmospheric pressure. As-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR) and electrochemical tests. The prepared LiMnPO4/C nanorods were coated with a thin carbon layer (approximately 3 nm thick) on the surface and had a length of 100–150 nm and a diameter of 40–55 nm. The prepared rod-like LiMnPO4/C delivered a discharge capacity of 128 mAh·g−1 with a capacity retention ratio of approximately 93% after 100 cycles at 1 C. Even at 5 C, it still had a discharge capacity of 106 mAh·g−1, thus exhibiting good rate performance and cycle stability. These results demonstrate that the chloride/ethylene glycol-based deep eutectic solvents (DES) can act as a new crystal-face inhibitor to adjust the oriented growth and morphology of LiMnPO4. Furthermore, deep eutectic solvents provide a new approach in which to control the size and morphology of the particles, which has a wide application in the synthesis of electrode materials with special morphology.