纳米sno2负极的电化学性质

锂离子电池;纳米sno2负极;慢扫描循环伏安;交流阻抗谱

Electrochemical Study of Nano-SnO2 Anode

Slow scanning cyclic voltammetry was employed to study stainless steel electrode in different electrolytes, solvents and lithium-salt. The impedance diagrams of nano-SnO2 anode/electrolyte interphase at different discharge states were analyzed with alternative current impedance spectroscopy. The results suggest that nonaqueous electrolyte reacts also on the surface of a nano-SnO2 anode as in lithium rechargeable batteries during the initial charge/discharge cycles, and results in the partial irreversible capacity loss. The electrochemical reaction of nano-SnO2 anode for lithium rechargeable batteries can be deduced as follows:a passivating film forms on the surface of nano-SnO2 particles first, then Li ions pass through the surface film and react with nano-SnO2 to produce amorphous Li2O and to form fine grains of Li-Sn alloys in the core region underneath the passivation film.