纳米Co-Sn金属间化合物的合成、表征及电化学吸放锂行为  

Preparation,Characterization and Electrochemical Li-absorption/extraction Behaviors of Nanosized Co-Sn Intermetallic Compounds

作　　者：谢健[1] 赵新兵[1] 余红明[1] 齐好[1] 曹高劭[1] 涂江平[1] 

机构地区：[1]浙江大学材料科学与工程系,杭州310027

出　　处：《物理化学学报》2006年第11期1409-1412,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(50201014);高校博士点基金(20010335045);中国博士后科研基金(2005038278)资助项目

摘　　要：用溶剂热法合成了三种纳米尺寸的Co-Sn金属间化合物,即CoSn2、CoSn和CosSn2,并研究了它们作为锂离子二次电池新型负极材料的电化学性能．合成的粉末经过了X射线衍射(XRD),透射电镜(TEM)和场发射扫描电镜(FESEM)的表征．研究发现,这三种金属间化合物均显示出较高的充放电稳定性．由于低的钾离子扩散速率,在嵌锂过程中锂离子不能深入到晶粒内部,导致它们的电化学活性较低,尤其是Co3Sn2,其首次充电容量仅为93mAh·g-1．Three nanosized Co-Sn intermetallic compounds, namely, CoSn2, CoSn, and Co3Sn2, were prepared by solvothermal route and studied as new candidate anode materials for secondary lithium-ion batteries. The as-prepared powders were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and field emission scanning electron microscopy （FESEM）. It was found that these three intermetallic compounds showed a high chargedischarge stability. However, they exhibit low electrochemical activity, especially for Co3Sn2, whose first charge capacity is only 93 mAh· g^-1 because Li-ions cannot reach the interior of the crystal due to the low Li-ions diffusion rate.

关 键 词：锂离子电池 负极材料 溶剂热法 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]