NDLI: Surfactants assisted synthesis of nano-LiFePO<sub>4</sub>/C composite as cathode materials for lithium-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Jingji Fu, Dongju Wang, Hongqiang Li, Qingyu Zhang, Xiaohui Huang, Youguo Zheng, Fenghua Yin, Jinchao Wu, Qiang
Copyright Year	2015
Abstract	The goal of this research was to study the effect of molecular structure surfactant on the performance of LiFePO4/C composite. The solid state reaction method was applied to prepare a series of LiFePO4/C materials by adding various surfactants. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Infrared spectrum analysis (FTIR), Raman spectral analysis and electrochemical methods. The results confirm the existence of interactions between the surfactant molecules and the precursor that contribute to the formation of nanoparticles and a homogeneous carbon coating layer on the surface. The structure of the surfactants played an important role in improving the performance of LiFePO4/C composites. The structures of surfactants affect the particle size and the amount of graphite-like carbons of LiFePO4/C composites. The surfactant with longer alkyl C–C chain length could effectively prevent particle growth, while the surfactant with shorter alkyl C–C chain length form more graphene-like carbon during pyrolysis. The as-prepared LiFePO4/C particles using various surfactants show different electrochemical performances. According to Raman spectroscopy and EIS analysis, these composites have different ID/IG peak ratios and charge transfer resistance. Especially, LiFePO4/C synthesis with composite surfactant (weight ratio of Tween80 to Tween20 equal to 1.5) showed an excellent electrochemical performance with a discharge capacity of 167.3 mA h g−1 at 0.1 C rate and 129.4 mA h g−1 at 5 C rate.
Starting Page	2025
Ending Page	2035
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta03293d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	EIS Raman Surfactant X-ray crystallography Scanning electron microscope Transmission electron microscopy Electrochemistry Carbon Alkane Pyrolysis Raman spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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