Preparation and Electrochemical Properties of LiMn0.8Fe0.2PO4/C Nanocomposite

doi:10.3724/SP.J.1077.2013.13142

Abstract

Abstract: Olivine-structured LiMn_0.8Fe_0.2PO₄/C solid solution was successfully prepared by a Sol-Gel approach combined with a high-temperature solid-state reaction, and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results revealed that LiMn_0.8Fe_0.2PO₄ nanoparticles were evenly dispersed in the in-situ formed carbon conductive network. When the nanocomposite served as a cathode material for lithium-ion batteries (LIBs), except a short plateau (~3.5 V vs Li⁺/Li) ascribed to Fe³⁺/Fe²⁺ couples in the charging/discharging profile, the long plateau at higher voltage (~4.1 V vs Li⁺/Li) is corresponding to the redox reaction of Mn during the Li+ extraction/insertion in the LiMn_0.8Fe_0.2PO₄ lattice, and this high voltage plateau can significantly enhance the energy density of relevant LIBs. In addition, the chemical diffusion behavior of lithium in the LiMn_0.8Fe_0.2PO₄/C electrode was investigated in detail using galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscope (EIS), and the chemical diffusion coefficients of lithium, D_Li, obtained by GITT and EIS were 5×10^-15 -1×10^-14 cm²/s and 1.27×10^-13- 2.11×10^-13 cm²/s, respectively. The results indicate that the value of D_Li increases with elevated test temperature, and it can be inferred that the electrochemical properties of such materials can be improved by raising the working temperature.

Key words: LiMn_0.8Fe_0.2PO₄/C nanocomposite, galvanostatic intermittent titration technique, electrochemical impedance spectroscopy, chemical diffusion coefficient of lithium, lithium-ion battery

CLC Number:

TQ174

SU Jing, WU Xing-Long, GUO Yu-Guo. Preparation and Electrochemical Properties of LiMn_0.8Fe_0.2PO₄/C Nanocomposite[J]. Journal of Inorganic Materials, 2013, 28(11): 1248-1254.

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Preparation and Electrochemical Properties of LiMn_0.8Fe_0.2PO₄/C Nanocomposite

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