核-壳结构Fe_2O_3@SnO_2负极材料的制备及性能

Preparation and performance of core-shell Fe_2O_3@SnO_2 anode material

用低熔点盐Li Cl和Li NO_3作为反应介质,以Fe Cl_3和Sn Cl_2为反应原料,通过低温熔盐法制备Fe_2O_3@SnO_2颗粒。对材料进行XRD、SEM和透射电子显微镜(TEM)分析,以及恒流充放电、循环伏安和交流阻抗等测试。制备的Fe_2O_3@SnO_2复合材料为球形核-壳结构,电化学性能好于纯Fe_2O_3和SnO_2。SnO_2包覆量为α-Fe_2O_3的4%时,Fe_2O_3/SnO_2复合材料的充放电性能最好,以0.1 A/g的电流在0.8~2.5 V循环100次,比容量仍有1 000.7 m Ah/g。

Fe2O3@SnO2particles were synthesized by low temperature molten salt reaction,low melt point Li Cl and Li NO3were used as reaction media,Fe Cl3and Sn Cl2were used as the raw materials.XRD,SEM and transmission electron microscope（TEM）analyses were utilized to analysis the prepared materials.The galvanostatic charge-discharge,cyclic voltammetry and A.C.impedance spectroscopy tests were taken.The as-prepared Fe2O3@SnO2was core-shell structure.Its electrochemical performance was better than those of pure Fe2O3and SnO2.When the SnO2coating amount was 4%（based on the weight ofα-Fe2O3）,the charge-discharge performance of Fe2O3@SnO2was the best.Its specific capacity was kept at 1 000.7 m Ah/g when cycled 100 times at the current of 0.1 A/g in 0.8-2.5 V.