Performance of Sn-Cu Alloy Anode at Low Temperature
摘要
Sn-Cu alloy anode was prepared by pulsed electrodeposition for lithium ion batteries, and its electrochemical performance was tested at Iow temperature. When temperature decreased from 25℃ to -20℃, the Sn-Cu alloy anode provided the capacity retentions of 76% in the electrolyte of 1 mol/L LiBF4/EC+EMC+γBL and 51% in the electrolyte of 1 mol/L LiPF6/EC+DMC+DEC. Under the same conditions, the graphite anode presented the capacity retentions of only 41% and 18%, respectively. The Sn-Cu alloy anode showed better performance in the electrolyte of 1 mol/L LiBF4/EC+EMC+γBL than in the electrolyte of 1 mol/L LiPF6/EC+DMC+DEC, and kept much higher capacity retention than that of graphite at -20℃. The Sn-Cu alloy anode in the electrolyte of 1 mol/L LiBF4/EC+EMC+γBL (1:1:1, volume ratio) is promising for Iow temperature application of lithium batteries.