Preparation and Electrochemical Performance of SnO_2/C- La_(0.3)Sr_(0.7)MnO_3 Composites for Li-Ion Anode

摘要

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_(0.3)Sr_(0.7)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 froml65 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.