Synthesis and electrochemical characterizations of nano-crystalline LiFePO4 and Mg-doped LiFePO4 cathode materials for rechargeable lithium-ion batteries |
| |
Authors: | D Arumugam G Paruthimal Kalaignan P Manisankar |
| |
Institution: | (1) Advanced Lithium-Ion Battery Research Lab, Department of Industrial Chemistry, Alagappa University, Karaikudi, 630 003, India |
| |
Abstract: | Nano-crystalline LiFePO4 and LiMg0.05Fe0.95PO4 cathode materials were synthesized by sol–gel method in argon atmosphere using succinic acid as a chelating agent. Physico-chemical
characterizations were done by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy,
transmittance electron microscopy, and Raman spectroscopy. Electrochemical behavior of the cathode materials were analyzed
using cyclic voltammetry, and galvanostatic charge/discharge cycling studies were employed to characterize the reaction of
lithium-ion insertion into and extraction from virginal and magnesium-doped LiFePO4, in the voltage range 2.5 to 4.5 V (Vs Li/Li+) using 1 M LiPF6 with 1:1 ratio of ethylene carbonate and dimethyl carbonate as electrolytes. LiMg0.05Fe0.95PO4 exhibits initial charge and discharge capacities of 159 and 141 mAh/g at 0.2 C rate respectively, as compared to 121 and
107 mAh/g of pristine LiFePO4. Furthermore, LiMg0.05Fe0.95PO4 has retained more than 89% of the capacity even after 60 cycles. Hence, LiMg0.05Fe0.95PO4 is a promising cathode material for rechargeable lithium-ion batteries. |
| |
Keywords: | Lithium-ion batteries LiFePO4 LiMg0 05Fe0 95PO4 Sol– gel method TG/DTA XRD SEM TEM Raman spectroscopy Cyclic voltammetry Galvanostatic charge/discharge |
本文献已被 SpringerLink 等数据库收录! |
|