Liquid-phase preparation and electrochemical property of LiFePO4/C nanowires
来源期刊：中南大学学报(英文版)2014年第2期
论文作者：TIAN Li(田俐) CHEN Lin(陈琳)
文章页码：477 - 481
Key words：liquid-phase preparation; LiFePO4; nanowires; electrochemical property
Abstract: Olivine LiFePO4/C nanowires have been successfully synthesized by a simple and eco-friendly solution preparation. The phase, structure, morphology and composition of the as-prepared products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential-thermogravimetric analysis (TG-DTA) and energy dispersive X-ray spectrometry (EDS) techniques, showing uniform nanowire shape of LiFePO4/C with a diameter of 80-150 nm and a length of several microns. The heat-treated LiFePO4/C nanowires show excellent electrochemical properties of specific discharge capacity, rate capacity and cycling stability. In particular, the LiFePO4/C nanowires heat-treated at 400 °C show preferable first discharge specific capacity of 161 mA·h/g at 0.1C rate, while the voltage platform is 3.4 V and the first discharge specific capacity is 93 mA·h/g at 20C rate. The specific capacity retention is 98% after 50 cycles at 5C rate.
TIAN Li(田俐)1, 2, CHEN Lin(陈琳)1
(1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China;
2. Key Laboratory of Ecological Impacts of Hydraulic-projects and Restoration of Aquatic Ecosystem,
Minister of Water Resources (Institute of Hydroecology, MWR and CAS), Wuhan 430079, China)
Abstract:Olivine LiFePO4/C nanowires have been successfully synthesized by a simple and eco-friendly solution preparation. The phase, structure, morphology and composition of the as-prepared products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric and differential-thermogravimetric analysis (TG-DTA) and energy dispersive X-ray spectrometry (EDS) techniques, showing uniform nanowire shape of LiFePO4/C with a diameter of 80-150 nm and a length of several microns. The heat-treated LiFePO4/C nanowires show excellent electrochemical properties of specific discharge capacity, rate capacity and cycling stability. In particular, the LiFePO4/C nanowires heat-treated at 400 °C show preferable first discharge specific capacity of 161 mA·h/g at 0.1C rate, while the voltage platform is 3.4 V and the first discharge specific capacity is 93 mA·h/g at 20C rate. The specific capacity retention is 98% after 50 cycles at 5C rate.
Key words:liquid-phase preparation; LiFePO4; nanowires; electrochemical property
