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以LiOH·H2O、MnSO4?H2O和(NH4)3PO4为反应物,PVP为表面活性剂,采用水热法制备了LiMnPO4正极材料。通过化学气相沉积法,以甲苯为碳源,对材料进行表面碳包覆。利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对材料晶体结构和微观形貌进行表征。结果表明,合成的LiMnPO4粒径小(约100nm)且分布均匀,颗粒表面包覆了一层厚度约10nm的均匀、完整的导电碳层。在50℃0.1C倍率下LiMnPO4/C的放电容量达到124mAh/g,循环100次容量保持率达到96%,2C倍率下的放电容量保持了0.1C时的75%,表现出优异的循环稳定性和倍率性能。
Using LiOH · H2O, MnSO4? H2O and (NH4) 3PO4 as reactants and PVP as surfactant, the LiMnPO4 cathode material was prepared by hydrothermal method. By chemical vapor deposition, toluene as a carbon source, the material surface carbon coating. The crystal structure and microstructure of the material were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the synthesized LiMnPO4 particles have a small size (about 100 nm) and a uniform distribution. The surface of the particles is coated with a uniform and complete conductive carbon layer with a thickness of about 10 nm. The discharge capacity of LiMnPO4 / C reached 124mAh / g at 50 ℃ 0.1C rate, the capacity retention of 96% after 100 cycles, the discharge capacity of 2C at 75% of 0.1C showed excellent cycling stability And rate performance.