Advanced Powder Technology, Vol.27, No.4, 1730-1737, 2016
Solution combustion synthesis of porous Sn-C composite as anode material for lithium ion batteries
In this study, a Sn-C composite material as anode material for lithium ion batteries was fabricated via MgO template-assisted solution combustion synthesis, in which the starting material was a gel containing Sn(NO3)(2), glycine (C2H5O2N) as the carbon source, and Mg(NO3)(2)center dot 6H(2)O for the template. After the combustion reaction, the generated MgO was removed from the carbon, and the Sn nanoparticles were dispersed into a porous carbon structure during the carbon reduction of SnO2 under calcination in N-2. The effects of ratios of glycine (n) and MgO (m) on the material phase, morphology, carbon content, and electrochemical properties were mainly investigated. At glycine (n) ratios of 2 and 3, the SnO2 phase was not fully reduced to Sn. With n > 3, a composite material of metallic Sn nanoparticles and carbon was synthesized, in which the ratio of carbon increased with increasing n. With increasing m, the porosity of the particles increased, resulting in enhanced cyclic stability owing to the buffer space provided by the porous structure of carbon. The composite material obtained at n = 4 and m = 4 exhibited the highest reversible capacity of 588 mA h/g after 100 discharge/charge cycles at a current rate of 0.5 A/g as compared to the 269 mA h/g observed for n = 4 and m = 2. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.