Research Of Tin-based Alloy As Negative Material For Lithium Ion Batteries

Rechargeable lithium-ion battery has the best applying prospect in the battery market. The property of battery is decided greatly by choosing the suitable electrode materials, which should store enough lithium and have excellent reversibility of lithium intercalation/extraction in order to fulfill the cell performance of high energy density, high voltage and excellent cycle life. In commercial applications the graphite and other carbonaceous materials were widely used as negative electrode materials, however, these carbon-based cathode materials have some self-blemish. To get better cathode materials, a large number of alternative possibilities for cathode of lithium-ion batteries have recently been studied and reported in the literatures. Especially, the tin-based alloy electrodes has attracted special attentions in the research of cathode materials for lithium-ion batteries.In this paper, by X-Ray Diffraction (XRD), scanning electron microscope(SEM), charge/discharge cycling and cyclic voltammetry(CV), tin-based alloy electrodes prepared by electroplating and the tin metallic electrodes intermingled with nickel-nanotube by liquid reduction were systematically studied.The properties of batteries were decided by choosing SnZn,Sn/SnZn and Sn/Zn metal negative electrode. When tin was prepared by electroplating before and ZnSO4 density raised to 16g/L in basic SnZn alloy solution, the first-charging capacity of Sn/SnZn metal electrode was 253.9mAh/g and the first-discharging capacity was 521.9mAh/g. 20th charging capacity was 140mAh/g and 20th discharging capacity was 141.1mAh/g.Sn/SnNi alloy electrodes were studied,which were prepared by different solutions in different density.When SnCl2·2H2O density arrived to 20g/L in SnNi alloy solution, the first-charging capacity of alloy electrode was 210.4 mAh/g and the first-discharging capacity was 450.1mAh/g. 20th charging capacity was 110mAh/g and 20th discharging capacity was 117.2mAh/g.Sn/SnCo alloy electrodes were studied,which were prepared by different solutions in different density.When SnCl2·2H2O density arrived to 50g/L in SnCo alloy solution, the alloy electrode's surface had spherical particle, whose first-charging capacity was 316.8 mAh/g and first-discharging capacity was 545.3mAh/g while 35th charging capacity was 122.7mAh/g and 35th discharging capacity was 130mAh/g.The tin metallic negative electrodes were intermingled with nickel-nanotube, whose first-charging capacity was 455.0mAh/g, first-discharging capacity was 625.6mAh/g, 15th charging capacity was 122.4mAh/g and 15th discharging capacity was 108.6mAh/g.