Journal
IONICS
Volume 20, Issue 6, Pages 817-823Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-013-1035-6
Keywords
Lithium iron orthosilicate; Cathode material; Sol-gel method; Lithium-ion battery
Funding
- Research Foundation for Key Project of Education Bureau of Henan Province, China [13A530362]
- Doctoral Foundation of Zhengzhou University of Light Industry [000346]
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Li2FeSiO4/C composites were synthesized via a tartaric-acid-assisted sol-gel method with ethanol and ethylene glycol (EG) as mixed solvents. Effects of solvent composition on the physical properties and electrochemical performances of Li2FeSiO4/C were studied. The materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical performances of Li2FeSiO4/C were evaluated by galvanostatic charge-discharge and electrochemical impedance spectra (EIS) measurements. The results show that the addition of EG to ethanol solvent during preparation has a positive effect on the electrochemical performance of Li2FeSiO4/C. The sample synthesized using EG-ethanol with the volume ratio of 2:7 has the best electrochemical performance. It delivers an initial discharge capacity of 105 mAh g(-1) at C/16. AC impendence investigation shows that Li2FeSiO4/C synthesized using the optimal EG/ethanol volume ratio has lower resistance of electrode/electrolyte interface and higher lithium-ion diffusion coefficient than that synthesized using ethanol as solvent.
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