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

Abstract

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 Na 2 S 2 O 4 in aqueous solution and completely converted to SnO 2 after pyrolysis. The synthesized tin-modified graphite composites were characterized by X-ray diffraction (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-SnO 2 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 SnO 2-modified graphite composite anode plays important roles in improving the electrochemical properties of LIBs.

Study on Fabrication and Electrochemical Performances of Fe₇S₈@C Composite Materials

“…1,2 The concept that carbon mixes the active materials is extensively utilized to fabricate electrode materials. [3][4][5][6][7][8][9] In particular, transition metal oxides such as Fe 2 O 3 , Fe 3 O 4 , FeO are entering the visions of researches, for they have the high theoretical capacity. [10][11][12][13] Thus, the composite method using the metal oxides with carbon materials is becoming popular gradually.…”