NDLI: Surface aging at olivine LiFePO<sub>4</sub>: a direct visual observation of iron dissolution and the protection role of nano-carbon coating

Content Provider	Royal Society of Chemistry (RSC)
Author	Sham, Tsun-Kong Liang, Guoxian Tang, Yongji Wang, Jiajun Li, Ruying Yang, Jinli Sun, Xueliang
Copyright Year	2013
Abstract	LiFePO4 has attracted much attention as a potential cathode material for advanced lithium-ion batteries due to its superior thermal stability. In spite of this, LiFePO4 still suffers from fast capacity fading at high temperature and/or moisture-contaminated electrolyte. The influence of moisture and the detailed corrosion mechanism is still not clear. Here, for the first time, we present a direct visual observation of the surface corrosion process at olivine LiFePO4 stored in moisture-contaminated electrolyte, and found the direct relationship between iron dissolution and LiFePO4 corrosion. By using the LiFePO4 ingot sample with a flat surface as model materials, iron dissolution and surface chemistry change can be clearly observed and identified by field-emission scanning electron microscopy (SEM), time-of-flight-secondary ion mass spectroscopy (TOF-SIMS), and X-ray absorption near-edge structure (XANES). These iron dissolutions at some corrosion sites evoked the overall LiFePO4 surface corrosion. A significant improvement of the surface stability of LiFePO4 was obtained by nano-carbon coating, and the carbon surface layer protects LiFePO4 from direct contact with corrosive medium, effectively restraining the surface corrosion and preserving the initial surface chemistry of LiFePO4.
Starting Page	1579
Ending Page	1586
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c2ta00521b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cathode Lithium-ion battery Electrolyte Corrosion Olivine Ingot Surface science Scanning electron microscope Ion Spectroscopy X-ray absorption spectroscopy X-ray absorption near edge structure Carbon Direct Contact
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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