Nano-sized Tin Oxide-Modified Graphite Composite as Efficient Anode Material for Lithium Ion Batteries

Chia-Chin Chang, Department of Greenergy, National University of Tainan, Tainan 70005, Taiwan
2018 International Journal of Electrochemical Science  
Nano-sized tin based compounds dispersed graphite composites, synthesized by the electroless plating process and pyrolysis method, act as efficient anode materials for lithium ion batteries (LIBs). The nano-sized tin complexes on the graphite surface can be obtained through a simple chemical reaction between Sn(BF4)2 and Na2S2O4 in aqueous solution and completely converted to SnO2 after pyrolysis. The synthesized tin-modified graphite composites were characterized by X-ray diffraction (XRD),
more » ... ffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and high-resolution transmission electron microscopy (HRTEM). The electrochemical performance of the composites for application as anode materials in lithium-ion batteries was investigated. The average particle size of nano-SnO2 is ~14.7 nm, as determined by HRTEM. Results of infrared spectra and electrochemical properties indicate that such an optimized nano Sn-based compound on graphite influences the formation of the thin solid electrolyte interface (SEI) in the electrode and thus improves the cycling performance, with high efficiency of 97.3% in LIBs. Nyquist plots show that during Li + intercalation, the thin SEI film and the low charge transfer resistance of SnO2-modified graphite composite anode plays important roles in improving the electrochemical properties of LIBs.
doi:10.20964/2018.12.28 fatcat:mxssehmjzbgrrpv23bkmha7pby