Abstract:In order to investigate effect of titanium concentration on lithium-storage performance of silicon-titanium composite, silicon-titanium composite with titanium mass fraction of 3.3%, 6.4% and 8% was selected as anode of lithium-ion battery to investigate its electrochemical performance. The results suggest that addition of titanium is independent on lithiation/delithiation reaction potentials of active silicon, but affects lithium-storage performance of anode greatly. The first lithiation specific capacity of silicon-titanium composite drops and initial columbic efficiency of anode rises with increase of titanium concentration in silicon-titanium composite. When titanium concentration is 8%, lithiation-storage performance of anode reaches the best values with the first discharge specific capacity of 2 107.02 mAh/g and initial columbic efficiency of 89.95%. After cycling for 50 times, the specific capacity retention ratio of anode is 80.72% with average capacity decaying ratio of 0.38% per-cycle.