Preparation and Electrochemical Performance of SnO₂/C-La_0.3Sr_0.7MnO₃Composites for Li-Ion Anode

Abstract

Carbon-coated SnO 2 particles (SnO 2 /C) were first synthesized by hydrolysis of SnCl 4 in the sucrose solution at 85 °C, where sucrose is the carbon source. These particles were then mixed with La 0.7 Sr 0.3 MnO 3 (LSM) through a suspension stirring process to form SnO 2 /C-LSM composites. The results of SEM and EDX show that LSM particles are distributed in SnO 2 /C uniformly. Galvanostatic discharge-charge measurement was used to test the electrochemical performance of SnO 2 /C and SnO 2 /C-LSM. It was found that the specific reversible capacity increased from165 mAh/g for SnO 2 /C to 270 mAh/g for SnO 2 /C-LSM after 50 cycles. This improvement may be attributed to the lower charge transfer resistance and higher electronic conductivity resulted from introducing LSM.