Nghiên cứu cấu trúc, tính chất đan cài ion Li+ và dung luowjngh phóng nạp của vật liệu LiMnxFe1-xPO4/cacbon (x = 0.1 và 0.2)

In this work, Mn-doped olivine LiMnxFel_xPO4/C (x = 0.1 and 0.2) synthesized by the hydrothermal method were investigated the crystalline structure and morphology by using X-ray diffraction (XRD), Raman scattering spectroscopy, Thermal Gravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM). The electrochemical performance was analyzed by Cyclic Voltammetry (CV) and Galvanostatic Cycling with Potential Limitation (GCPL). The materials exhibited the same initial capacity of 92 mAh/g and 95 mAh/g for LiMn0.1Fe0.9PO4/C and LiMn0.18Fe0.8PO4/C, respectively but the former is significantly more stable. LiMn0.1Fe0.9PO4 maintained 89 % of its initial capacity after 30 cycles whereas than the system with x = 0.2 (69 % at 30th cycle). Additionally, the Li+ ion diffusion coefficient of LiMn0.1Fe0.9PO4 showed a greater number of 8,16X 10-12 cm2/s compared to that ofLiMn0.2Fe0.8PO4 (1 ,42X 10 12cmvs).