Enhanced performance of LiFePO4 through hydrothermal synthesis coupled with carbon coating and cupric ion doping |
| |
Authors: | Bo Pei Qiang Wang Weixin Zhang Zeheng Yang Min Chen |
| |
Affiliation: | aSchool of Chemical Engineering, Heifei University of Technology, Hefei, Anhui 230009, PR China;bAnhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei, Anhui 230009, PR China |
| |
Abstract: | A hydrothermal reaction has been adopted to synthesize pure LiFePO4 first, which was then modified with carbon coating and cupric ion (Cu2+) doping simultaneously through a post-heat treatment. X-ray diffraction patterns, transmission electron microscopy and scanning electron microscopy images along with energy dispersive spectroscopy mappings have verified the homogeneous existence of coated carbon and doped Cu2+ in LiFePO4 particles with phospho-olivine structure and an average size of 400 nm. The electrochemical performances of the material have been studied by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge–discharge measurements. The carbon-coated and Cu2+-doped LiFePO4 sample (LFCu5/C) exhibited an enhanced electronic conductivity of 2.05 × 10−3 S cm−1, a specific discharge capacity of 158 mAh g−1 at 50 mA g−1, a capacity retention of 96.4% after 50 cycles, a decreased charge transfer resistance of 79.4 Ω and superior electrode reaction reversibility. The present synthesis route is promising in making the hydrothermal method more practical for preparation of the LiFePO4 material and enhancement of electrochemical properties. |
| |
Keywords: | Lithium ion batteries Lithium iron phosphate Hydrothermal synthesis Modification Post-heat treatment |
本文献已被 ScienceDirect 等数据库收录! |
|