Ternary Sn-sb-co Alloy Film As New Negative Electrode For Lithium-ion Cells

摘要

Ternary Sn-Sb-Co alloy film was successfully prepared by the co-electroplating method using an aqueous solution bath containing SnCl_2-2H_2O, CoCl_2, SbCl_3, Na_2C_4H_4O_6·2H_2O, K_3C_6H_5O_7·H_2O, and gelatine. The alloy composition was found to be mainly controllable by the amount of Na_2C_4H_4O_6·2H_2O and SbCl_3 in the plating bath. The Sn-Sb-Co film electrode with a composition of 75.4% Sn, 6.5% Sb, and 18.1% Co gave an initial discharge capacity of 380 mAh g~(-1). The capacity gradually increased from the 1st to the 10th cycle and was then stabilized at a larger value of 580 mAh g~(-1). Furthermore, the electrode was found to give better cycle performance compared to binary Sn-Co and Sn-Sb alloys.