Glucose-Assisted Synthesis of Highly Dispersed LiMnPO4 Nanoparticles at a Low Temperature for Lithium Ion Batteries
Glucose-Assisted Synthesis of Highly Dispersed LiMnPO4 Nanoparticles at a Low Temperature for Lithium Ion Batteries
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低温葡萄糖辅助合成高分散LiMnPO4纳米粒子用于锂离子电池
DOI：
10.1016/j.electacta.2015.12.111
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发表时间：
2016-01
影响因子：
6.6
通讯作者：
Haijiang Wang
中科院分区：
文献类型：
--
作者：
Xiaoning Fu;Zhaorong Chang;Xiao-Zi Yuan;Haijiang Wang
采用乙二醇液相法一步法制备了锂离子电池正极材料LiMnPO4/C。用X射线衍射仪(X射线衍射仪)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对样品的晶体结构、形貌、微观结构和粒度进行了表征。X射线衍射结果表明，在葡萄糖辅助下的液相中可以直接合成结晶度较高的纯相LiMnPO4。扫描电子显微镜测量证实了LiMnPO4形貌的纳米棒尺寸均匀，宽度为20-50 nm，长度为50-80 nm。透射电子显微镜分析表明，在葡萄糖存在下，经过短时高温热处理后，得到的LiMnPO4纳米棒表面覆盖有均匀的碳层。这可能是由于EG与葡萄糖回流时产生的乙二醇苷能够有效地抑制颗粒的生长和团聚。电化学测试结果表明，所制备的LiMnPO4/C纳米棒不仅具有155.3−1的首次放电容量，而且具有良好的循环稳定性，在0.05C循环100次后，容量保持率为94%。
The cathode material of the LiMnPO4/C composite for lithium-ion batteries is successfully synthesized via a one-step glucose-assisted liquid-phase method in ethylene glycol (EG). The crystalline structure, morphology, micro-structure and particle size are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). XRD results show that the pure phase of LiMnPO4with high crystallinity can directly be prepared in the liquid-phase assisted by glucose. SEM measurements confirm the uniform-sized nanorods of the LiMnPO4morphology with a width of 20–50 nm and a length of 50–80 nm. TEM characterization reveals that the surface of the obtained LiMnPO4nanorods is coated with a homogeneous carbon layer after a short heat treatment at a high temperature in the presence of glucose. This can be explained by the fact that the glycol glucoside generated during the refluxing of EG with glucose can effectively inhibit the growth and agglomeration of particles. Results of electrochemical tests show that the prepared LiMnPO4/C nanorods exhibit not only a high initial discharge capacity of 155.3 mAh g−1but also a good cycling stability, which retains 94% of the initial capacity over 100 cycles at 0.05 C.
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