Sn/C复合材料的制备及作为锂离子电池负极材料的性能

采用SnCl2.2H2O乙醇溶液浸渍竹炭和NaBH4还原方法制备出一种锂二次电池负极用Sn/C复合材料。考察了复合材料中Sn含量对产物收率、微观结构及电化学性能的影响。结果表明,Sn2+大部分进入到竹炭的孔道中,并被还原为单质Sn;当单质Sn与复合材料质量比为42.5∶100时,复合电极材料具有555.1mAh/g的可逆容量,循环20次后容量保持在423.8 mAh/g,显示出较好的实用性能。

Preparation of Sn/C composite materials and their electrochemical properties as anode materials for lithium-ion batteries

Sn/C anode materials for use in lithium-ion batteries have been prepared by impregnation of bamboo charcoal with an alcoholic solution of SnCl_2·2H_2O followed by reduction with NaBH_4.The effect of varying the Sn content on the yield,microstructure and electrochemical properties of the materials was investigated.The results show that most of the Sn~(2+) entered the pores of the charcoal and was reduced to metallic tin.When the percentage by mass of Sn in the composite material was 42.5%,its reversible capacity as an Sn/C anode material was about 555.1 mAh/g.After 20 charge/discharge cycles,the charge and discharge capacity remained above 423.8 mAh/g.The composites showed good practical performance as anode materials for lithium-ion batteries.