材料科学
正交晶系
石墨
化学工程
阴极
电化学
循环伏安法
扩散
离子
相(物质)
分析化学(期刊)
电极
晶体结构
结晶学
复合材料
物理化学
色谱法
化学
热力学
物理
工程类
有机化学
作者
Minh Thu Nguyen,Thanh Liem Pham,Huynh Thi Kim Tuyen,Hue Ngan Dai,My Loan Phung Le
摘要
Abstract In this article, we study two factors (carbon additive, N/P ratio) affecting the performance of Li‐ion cells using LiFePO 4 (LFP) synthesized via the hydrothermal method. X‐ray diffraction (XRD) results show that the synthesized LFP material is pure and within the single phase of the orthorhombic lattice. The electrochemical properties of synthesized LFP cathode (physically mixed with different carbon C65 and CNTs) were studied by cyclic voltammetry (CV) and galvanostatically cycling. The diffusion coefficients of LFP‐CNTs and LFP‐C65 were calculated using the Randles‐Sevcik equation and reached 8.350.10 −10 cm 2 s −1 and 1.620.10 −10 cm 2 s −1 , respectively. In a rate capability tests, LFP‐CNTs based cell demonstrates an excellent cyclability with a discharge capacity (Cap Dis ) of 147.9 mAh g −1 at 0.1C and 84.0 mAh g −1 at 5.0C, whereas LFP‐C65 completely lost capacity at 2.0C. In addition, the investigation of negative/positive capacity ratios (N/P ratios) at 1.18 and 1.23 reveals high specific capacity (Cap spe ), high‐capacity retention, and an excellent charge/discharge efficiency ( E C/DC ) at different C‐rates.
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