Journal
APPLIED SURFACE SCIENCE
Volume 435, Issue -, Pages 1329-1336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.11.276
Keywords
LiFePO4; Low-temperature performance; Hydrothermal method; Lithium-ion batteries
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Funding
- National Natural Science Foundation of China [51372178]
- Natural Science Foundation for Distinguished Young Scholars of Hubei Province of China [2013CFA021]
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The LiFePO4/C composites have been successfully synthesized by a hydrothermal process, with the combined carbon sources of fructose and calcium lignosulfonate. The morphology and microstructure of LiFePO4/C were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The electrochemical properties were evaluated by the constant-current charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The uniform carbon coating layer derived from calcium lignosulfonate can effectively improve the electronic conductivity, lithium-ion diffusivity and surface stability of the LiFePO4/C composites and prevent the side reactions between the LiFePO4 particles and electrolytes. The LiFePO4/C composites display excellent rate capability, superior cycle life and outstanding low temperature performance, which are promising for lithium-ion battery applications in electrical vehicles and electrical energy storage systems. (C) 2017 Elsevier B.V. All rights reserved.
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